test: write custom test harness for tests

4 files changed, 950 insertions, 2 deletions

diff --git a/Cargo.lock b/Cargo.lock
index ff10b49..65cc172 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -45,6 +45,16 @@ version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "hermit-abi 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "autocfg"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -123,6 +133,20 @@ version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "clap"
+version = "2.33.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vec_map 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "console_error_panic_hook"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -146,6 +170,59 @@ version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "crossbeam-channel"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-deque"
+version = "0.7.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-epoch 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-epoch"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "memoffset 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-queue"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "crossbeam-utils"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cfg-if 0.1.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "ctor"
 version = "0.1.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -163,6 +240,7 @@ dependencies = [
  "hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libtest-mimic 0.2.0 (git+https://github.com/LukasKalbertodt/libtest-mimic)",
  "once_cell 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pest 2.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -379,6 +457,14 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "heck"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-segmentation 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "hermit-abi"
 version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -529,6 +615,17 @@ version = "0.2.71"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "libtest-mimic"
+version = "0.2.0"
+source = "git+https://github.com/LukasKalbertodt/libtest-mimic#bbdd404e13e10f1fae0a2ea6a9fbcc02201bef01"
+dependencies = [
+ "crossbeam-channel 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "structopt 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "log"
 version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -557,11 +654,24 @@ version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "maybe-uninit"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "memchr"
 version = "2.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "memoffset"
+version = "0.5.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "mime"
 version = "0.3.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -822,6 +932,30 @@ dependencies = [
 ]
 
 [[package]]
+name = "proc-macro-error"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro-error-attr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn-mid 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "proc-macro-hack"
 version = "0.5.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -890,6 +1024,29 @@ dependencies = [
 ]
 
 [[package]]
+name = "rayon"
+version = "1.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "autocfg 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-deque 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "either 1.5.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rayon-core 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rayon-core"
+version = "1.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "crossbeam-deque 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-queue 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "redox_syscall"
 version = "0.1.56"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -992,6 +1149,11 @@ version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "scopeguard"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "security-framework"
 version = "0.4.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1136,6 +1298,33 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "structopt"
+version = "0.3.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "clap 2.33.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "structopt-derive 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "structopt-derive"
+version = "0.4.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro-error 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "syn"
 version = "1.0.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1146,6 +1335,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "syn-mid"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "tempfile"
 version = "3.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1159,6 +1358,22 @@ dependencies = [
 ]
 
 [[package]]
+name = "termcolor"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi-util 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "thread_local"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1277,6 +1492,16 @@ dependencies = [
 ]
 
 [[package]]
+name = "unicode-segmentation"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "unicode-width"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "unicode-xid"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1297,6 +1522,11 @@ version = "0.2.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "version-sync"
 version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1493,6 +1723,7 @@ dependencies = [
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 "checksum ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
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 "checksum base64 0.12.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e223af0dc48c96d4f8342ec01a4974f139df863896b316681efd36742f22cc67"
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@@ -1505,9 +1736,15 @@ dependencies = [
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+"checksum crossbeam-deque 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "9f02af974daeee82218205558e51ec8768b48cf524bd01d550abe5573a608285"
+"checksum crossbeam-epoch 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "058ed274caafc1f60c4997b5fc07bf7dc7cca454af7c6e81edffe5f33f70dace"
+"checksum crossbeam-queue 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "774ba60a54c213d409d5353bda12d49cd68d14e45036a285234c8d6f91f92570"
+"checksum crossbeam-utils 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c3c7c73a2d1e9fc0886a08b93e98eb643461230d5f1925e4036204d5f2e261a8"
 "checksum ctor 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)" = "39858aa5bac06462d4dd4b9164848eb81ffc4aa5c479746393598fd193afa227"
 "checksum difference 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
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@@ -1534,6 +1771,7 @@ dependencies = [
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 "checksum h2 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "79b7246d7e4b979c03fa093da39cfb3617a96bbeee6310af63991668d7e843ff"
 "checksum half 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d36fab90f82edc3c747f9d438e06cf0a491055896f2a279638bb5beed6c40177"
+"checksum heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "20564e78d53d2bb135c343b3f47714a56af2061f1c928fdb541dc7b9fdd94205"
 "checksum hermit-abi 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "b9586eedd4ce6b3c498bc3b4dd92fc9f11166aa908a914071953768066c67909"
 "checksum hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "644f9158b2f133fd50f5fb3242878846d9eb792e445c893805ff0e3824006e35"
 "checksum http 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "28d569972648b2c512421b5f2a405ad6ac9666547189d0c5477a3f200f3e02f9"
@@ -1551,11 +1789,14 @@ dependencies = [
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 "checksum lexical-core 0.7.4 (registry+https://github.com/rust-lang/crates.io-index)" = "db65c6da02e61f55dae90a0ae427b2a5f6b3e8db09f58d10efab23af92592616"
 "checksum libc 0.2.71 (registry+https://github.com/rust-lang/crates.io-index)" = "9457b06509d27052635f90d6466700c65095fdf75409b3fbdd903e988b886f49"
+"checksum libtest-mimic 0.2.0 (git+https://github.com/LukasKalbertodt/libtest-mimic)" = "<none>"
 "checksum log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "14b6052be84e6b71ab17edffc2eeabf5c2c3ae1fdb464aae35ac50c67a44e1f7"
 "checksum loom 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4ecc775857611e1df29abba5c41355cdf540e7e9d4acfdf0f355eefee82330b7"
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 "checksum matches 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7ffc5c5338469d4d3ea17d269fa8ea3512ad247247c30bd2df69e68309ed0a08"
+"checksum maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "60302e4db3a61da70c0cb7991976248362f30319e88850c487b9b95bbf059e00"
 "checksum memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3728d817d99e5ac407411fa471ff9800a778d88a24685968b36824eaf4bee400"
+"checksum memoffset 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "b4fc2c02a7e374099d4ee95a193111f72d2110197fe200272371758f6c3643d8"
 "checksum mime 0.3.16 (registry+https://github.com/rust-lang/crates.io-index)" = "2a60c7ce501c71e03a9c9c0d35b861413ae925bd979cc7a4e30d060069aaac8d"
 "checksum mime_guess 2.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2684d4c2e97d99848d30b324b00c8fcc7e5c897b7cbb5819b09e7c90e8baf212"
 "checksum mio 0.6.22 (registry+https://github.com/rust-lang/crates.io-index)" = "fce347092656428bc8eaf6201042cb551b8d67855af7374542a92a0fbfcac430"
@@ -1585,6 +1826,8 @@ dependencies = [
 "checksum ppv-lite86 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "237a5ed80e274dbc66f86bd59c1e25edc039660be53194b5fe0a482e0f2612ea"
 "checksum pretty 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f60c0d9f6fc88ecdd245d90c1920ff76a430ab34303fc778d33b1d0a4c3bf6d3"
 "checksum pretty_assertions 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3f81e1644e1b54f5a68959a29aa86cde704219254669da328ecfdf6a1f09d427"
+"checksum proc-macro-error 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "98e9e4b82e0ef281812565ea4751049f1bdcdfccda7d3f459f2e138a40c08678"
+"checksum proc-macro-error-attr 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "4f5444ead4e9935abd7f27dc51f7e852a0569ac888096d5ec2499470794e2e53"
 "checksum proc-macro-hack 0.5.16 (registry+https://github.com/rust-lang/crates.io-index)" = "7e0456befd48169b9f13ef0f0ad46d492cf9d2dbb918bcf38e01eed4ce3ec5e4"
 "checksum proc-macro2 1.0.18 (registry+https://github.com/rust-lang/crates.io-index)" = "beae6331a816b1f65d04c45b078fd8e6c93e8071771f41b8163255bbd8d7c8fa"
 "checksum pulldown-cmark 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3e142c3b8f49d2200605ee6ba0b1d757310e9e7a72afe78c36ee2ef67300ee00"
@@ -1593,6 +1836,8 @@ dependencies = [
 "checksum rand_chacha 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f4c8ed856279c9737206bf725bf36935d8666ead7aa69b52be55af369d193402"
 "checksum rand_core 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "90bde5296fc891b0cef12a6d03ddccc162ce7b2aff54160af9338f8d40df6d19"
 "checksum rand_hc 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca3129af7b92a17112d59ad498c6f81eaf463253766b90396d39ea7a39d6613c"
+"checksum rayon 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "62f02856753d04e03e26929f820d0a0a337ebe71f849801eea335d464b349080"
+"checksum rayon-core 1.7.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e92e15d89083484e11353891f1af602cc661426deb9564c298b270c726973280"
 "checksum redox_syscall 0.1.56 (registry+https://github.com/rust-lang/crates.io-index)" = "2439c63f3f6139d1b57529d16bc3b8bb855230c8efcc5d3a896c8bea7c3b1e84"
 "checksum regex 1.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "9c3780fcf44b193bc4d09f36d2a3c87b251da4a046c87795a0d35f4f927ad8e6"
 "checksum regex-syntax 0.6.18 (registry+https://github.com/rust-lang/crates.io-index)" = "26412eb97c6b088a6997e05f69403a802a92d520de2f8e63c2b65f9e0f47c4e8"
@@ -1604,6 +1849,7 @@ dependencies = [
 "checksum schannel 0.1.19 (registry+https://github.com/rust-lang/crates.io-index)" = "8f05ba609c234e60bee0d547fe94a4c7e9da733d1c962cf6e59efa4cd9c8bc75"
 "checksum scoped-tls 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "332ffa32bf586782a3efaeb58f127980944bbc8c4d6913a86107ac2a5ab24b28"
 "checksum scoped-tls 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ea6a9290e3c9cf0f18145ef7ffa62d68ee0bf5fcd651017e586dc7fd5da448c2"
+"checksum scopeguard 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d29ab0c6d3fc0ee92fe66e2d99f700eab17a8d57d1c1d3b748380fb20baa78cd"
 "checksum security-framework 0.4.4 (registry+https://github.com/rust-lang/crates.io-index)" = "64808902d7d99f78eaddd2b4e2509713babc3dc3c85ad6f4c447680f3c01e535"
 "checksum security-framework-sys 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "17bf11d99252f512695eb468de5516e5cf75455521e69dfe343f3b74e4748405"
 "checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
@@ -1619,8 +1865,14 @@ dependencies = [
 "checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 "checksum socket2 0.3.12 (registry+https://github.com/rust-lang/crates.io-index)" = "03088793f677dce356f3ccc2edb1b314ad191ab702a5de3faf49304f7e104918"
 "checksum static_assertions 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "a2eb9349b6444b326872e140eb1cf5e7c522154d69e7a0ffb0fb81c06b37543f"
+"checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+"checksum structopt 0.3.15 (registry+https://github.com/rust-lang/crates.io-index)" = "de2f5e239ee807089b62adce73e48c625e0ed80df02c7ab3f068f5db5281065c"
+"checksum structopt-derive 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "510413f9de616762a4fbeab62509bf15c729603b72d7cd71280fbca431b1c118"
 "checksum syn 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)" = "e8d5d96e8cbb005d6959f119f773bfaebb5684296108fb32600c00cde305b2cd"
+"checksum syn-mid 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7be3539f6c128a931cf19dcee741c1af532c7fd387baa739c03dd2e96479338a"
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
+"checksum termcolor 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
+"checksum textwrap 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
 "checksum thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
 "checksum time 0.1.43 (registry+https://github.com/rust-lang/crates.io-index)" = "ca8a50ef2360fbd1eeb0ecd46795a87a19024eb4b53c5dc916ca1fd95fe62438"
 "checksum tinyvec 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "53953d2d3a5ad81d9f844a32f14ebb121f50b650cd59d0ee2a07cf13c617efed"
@@ -1636,9 +1888,12 @@ dependencies = [
 "checksum unicase 2.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
 "checksum unicode-bidi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "49f2bd0c6468a8230e1db229cff8029217cf623c767ea5d60bfbd42729ea54d5"
 "checksum unicode-normalization 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "6fb19cf769fa8c6a80a162df694621ebeb4dafb606470b2b2fce0be40a98a977"
+"checksum unicode-segmentation 1.6.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
+"checksum unicode-width 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "caaa9d531767d1ff2150b9332433f32a24622147e5ebb1f26409d5da67afd479"
 "checksum unicode-xid 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
 "checksum url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "829d4a8476c35c9bf0bbce5a3b23f4106f79728039b726d292bb93bc106787cb"
 "checksum vcpkg 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "6454029bf181f092ad1b853286f23e2c507d8e8194d01d92da4a55c274a5508c"
+"checksum vec_map 0.8.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
 "checksum version-sync 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382f6877399646e1b88f4b89813b4577147fa924464317378eb39c280d1e9e4c"
 "checksum version_check 0.9.2 (registry+https://github.com/rust-lang/crates.io-index)" = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 "checksum walkdir 2.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "777182bc735b6424e1a57516d35ed72cb8019d85c8c9bf536dccb3445c1a2f7d"
diff --git a/dhall/Cargo.toml b/dhall/Cargo.toml
index 9a30d24..ecb68eb 100644
--- a/dhall/Cargo.toml
+++ b/dhall/Cargo.toml
@@ -11,6 +11,10 @@ edition = "2018"
 build = "build.rs"
 include = ["src/**/*", "README.md", "build.rs"]
 
+[[test]]
+name = "spec"
+harness = false
+
 [dependencies]
 annotate-snippets = "0.7.0"
 hex = "0.4.2"
@@ -31,9 +35,12 @@ url = "2.1"
 reqwest = { version = "0.10", features = ["blocking"] }
 
 [dev-dependencies]
+# Latest master allows tests to be run in parallel.
+libtest-mimic = { version = "0.2.0", git = "https://github.com/LukasKalbertodt/libtest-mimic" }
 pretty_assertions = "0.6.1"
-version-sync = "0.9"
 rand = "0.7"
+version-sync = "0.9"
+walkdir = "2"
 
 [build-dependencies]
 walkdir = "2"
diff --git a/dhall/src/tests.rs b/dhall/src/tests.rs
index 08a4a4a..c9ba377 100644
--- a/dhall/src/tests.rs
+++ b/dhall/src/tests.rs
@@ -356,5 +356,5 @@ mod spec {
     }
 
     // See build.rs
-    include!(concat!(env!("OUT_DIR"), "/spec_tests.rs"));
+    // include!(concat!(env!("OUT_DIR"), "/spec_tests.rs"));
 }
diff --git a/dhall/tests/spec.rs b/dhall/tests/spec.rs
new file mode 100644
index 0000000..3521f6a
--- /dev/null
+++ b/dhall/tests/spec.rs
@@ -0,0 +1,686 @@
+use std::env;
+use std::ffi::OsString;
+use std::fs::{create_dir_all, read_to_string, File};
+use std::io::{Read, BufRead, BufReader, Write};
+use std::path::{Path, PathBuf};
+use std::rc::Rc;
+use std::fmt::Display;
+
+use walkdir::WalkDir;
+use libtest_mimic::{Arguments, Outcome, Test, run_tests};
+#[cfg(not(test))]
+use assert_eq as assert_eq_pretty;
+#[cfg(test)]
+use pretty_assertions::assert_eq as assert_eq_pretty;
+
+use dhall::error::{ErrorKind, Result};
+use dhall::syntax::{binary, Expr};
+use dhall::{Normalized, Parsed, Resolved, Typed};
+
+macro_rules! assert_eq_display {
+    ($left:expr, $right:expr) => {{
+        match (&$left, &$right) {
+            (left_val, right_val) => {
+                if !(*left_val == *right_val) {
+                    panic!(
+                        r#"assertion failed: `(left == right)`
+ left: `{}`,
+right: `{}`"#,
+                        left_val, right_val
+                    )
+                }
+            }
+        }
+    }};
+}
+
+/// Wrapper around string slice that makes debug output `{:?}` to print string same way as `{}`.
+/// Used in different `assert*!` macros in combination with `pretty_assertions` crate to make
+/// test failures to show nice diffs.
+#[derive(PartialEq, Eq)]
+#[doc(hidden)]
+pub struct PrettyString(String);
+
+/// Make diff to display string as multi-line string
+impl std::fmt::Debug for PrettyString {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        f.write_str(&self.0)
+    }
+}
+
+macro_rules! assert_eq_pretty_str {
+    ($left:expr, $right:expr) => {
+        assert_eq_pretty!(
+            PrettyString($left.to_string()),
+            PrettyString($right.to_string())
+        );
+    };
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+enum FileType {
+    /// Dhall source file
+    Text,
+    /// Dhall binary file
+    Binary,
+    /// Text file with hash
+    Hash,
+    /// Text file with expected text output
+    UI,
+}
+
+#[derive(Clone)]
+enum TestFile {
+    Source(String),
+    Binary(String),
+    UI(String),
+}
+
+impl FileType {
+    fn to_ext(self) -> &'static str {
+        match self {
+            FileType::Text => "dhall",
+            FileType::Binary => "dhallb",
+            FileType::Hash => "hash",
+            FileType::UI => "txt",
+        }
+    }
+    fn constructor(self) -> &'static str {
+        match self {
+            FileType::Text => "TestFile::Source",
+            FileType::Binary => "TestFile::Binary",
+            FileType::Hash => "TestFile::Binary",
+            FileType::UI => "TestFile::UI",
+        }
+    }
+    fn construct(self, path: &str) -> TestFile {
+        match self {
+            FileType::Text => TestFile::Source(format!("{}.{}", path, self.to_ext())),
+            FileType::Binary => TestFile::Binary(format!("{}.{}", path, self.to_ext())),
+            FileType::Hash => TestFile::Binary(format!("{}.{}", path, self.to_ext())),
+            FileType::UI => TestFile::UI(format!("{}.{}", path, self.to_ext())),
+        }
+    }
+}
+
+impl TestFile {
+    pub fn path(&self) -> PathBuf {
+        match self {
+            TestFile::Source(path)
+            | TestFile::Binary(path)
+            | TestFile::UI(path) => PathBuf::from("dhall").join(path),
+        }
+    }
+
+    /// Parse the target file
+    pub fn parse(&self) -> Result<Parsed> {
+        match self {
+            TestFile::Source(_) => Parsed::parse_file(&self.path()),
+            TestFile::Binary(_) => Parsed::parse_binary_file(&self.path()),
+            TestFile::UI(_) => panic!("Can't parse a UI test file"),
+        }
+    }
+    /// Parse and resolve the target file
+    pub fn resolve(&self) -> Result<Resolved> {
+        Ok(self.parse()?.resolve()?)
+    }
+    /// Parse, resolve and tck the target file
+    pub fn typecheck(&self) -> Result<Typed> {
+        Ok(self.resolve()?.typecheck()?)
+    }
+    /// Parse, resolve, tck and normalize the target file
+    pub fn normalize(&self) -> Result<Normalized> {
+        Ok(self.typecheck()?.normalize())
+    }
+
+    /// If UPDATE_TEST_FILES=1, we overwrite the output files with our own output.
+    fn force_update() -> bool {
+        env::var("UPDATE_TEST_FILES") == Ok("1".to_string())
+    }
+    /// Write the provided expression to the pointed file.
+    fn write_expr(&self, expr: impl Into<Expr>) -> Result<()> {
+        let expr = expr.into();
+        let path = self.path();
+        create_dir_all(path.parent().unwrap())?;
+        let mut file = File::create(path)?;
+        match self {
+            TestFile::Source(_) => {
+                writeln!(file, "{}", expr)?;
+            }
+            TestFile::Binary(_) => {
+                let expr_data = binary::encode(&expr)?;
+                file.write_all(&expr_data)?;
+            }
+            TestFile::UI(_) => panic!("Can't write an expression to a UI file"),
+        }
+        Ok(())
+    }
+    /// Write the provided string to the pointed file.
+    fn write_ui(&self, x: impl Display) -> Result<()> {
+        match self {
+            TestFile::UI(_) => {}
+            _ => panic!("Can't write a ui string to a dhall file"),
+        }
+        let path = self.path();
+        create_dir_all(path.parent().unwrap())?;
+        let mut file = File::create(path)?;
+        writeln!(file, "{}", x)?;
+        Ok(())
+    }
+
+    /// Check that the provided expression matches the file contents.
+    pub fn compare(&self, expr: impl Into<Expr>) -> Result<()> {
+        let expr = expr.into();
+        if !self.path().is_file() {
+            return self.write_expr(expr);
+        }
+
+        let expected = self.parse()?.to_expr();
+        if expr != expected {
+            if Self::force_update() {
+                self.write_expr(expr)?;
+            } else {
+                assert_eq_display!(expr, expected);
+            }
+        }
+        Ok(())
+    }
+    /// Check that the provided expression matches the file contents.
+    pub fn compare_debug(&self, expr: impl Into<Expr>) -> Result<()> {
+        let expr = expr.into();
+        if !self.path().is_file() {
+            return self.write_expr(expr);
+        }
+
+        let expected = self.parse()?.to_expr();
+        if expr != expected {
+            if Self::force_update() {
+                self.write_expr(expr)?;
+            } else {
+                assert_eq_pretty!(expr, expected);
+            }
+        }
+        Ok(())
+    }
+    /// Check that the provided expression matches the file contents.
+    pub fn compare_binary(&self, expr: impl Into<Expr>) -> Result<()> {
+        let expr = expr.into();
+        match self {
+            TestFile::Binary(_) => {}
+            _ => panic!("This is not a binary file"),
+        }
+        if !self.path().is_file() {
+            return self.write_expr(expr);
+        }
+
+        let expr_data = binary::encode(&expr)?;
+        let expected_data = {
+            let mut data = Vec::new();
+            File::open(&self.path())?.read_to_end(&mut data)?;
+            data
+        };
+
+        // Compare bit-by-bit
+        if expr_data != expected_data {
+            if Self::force_update() {
+                self.write_expr(expr)?;
+            } else {
+                use serde_cbor::de::from_slice;
+                use serde_cbor::value::Value;
+                // Pretty-print difference
+                assert_eq_pretty!(
+                    from_slice::<Value>(&expr_data).unwrap(),
+                    from_slice::<Value>(&expected_data).unwrap()
+                );
+                // If difference was not visible in the cbor::Nir, compare normally.
+                assert_eq!(expr_data, expected_data);
+            }
+        }
+        Ok(())
+    }
+    /// Check that the provided string matches the file contents. Writes to the corresponding file
+    /// if it is missing.
+    pub fn compare_ui(&self, x: impl Display) -> Result<()> {
+        if !self.path().is_file() {
+            return self.write_ui(x);
+        }
+
+        let expected = read_to_string(self.path())?;
+        let msg = format!("{}\n", x);
+        if msg != expected {
+            if Self::force_update() {
+                self.write_ui(x)?;
+            } else {
+                assert_eq_pretty_str!(expected, msg);
+            }
+        }
+        Ok(())
+    }
+}
+
+#[derive(Clone)]
+struct TestFeature {
+    /// Name of the module, used in the output of `cargo test`
+    module_name: &'static str,
+    /// Directory containing the tests files, relative to the base tests directory
+    directory: &'static str,
+    /// Relevant variant of `dhall::tests::Test`
+    variant: Rc<dyn Fn(TestFile, TestFile) -> SpecTest>,
+    /// Given a file name, whether to only include it in release tests
+    too_slow_path: Rc<dyn Fn(&str) -> bool>,
+    /// Given a file name, whether to exclude it
+    exclude_path: Rc<dyn Fn(&str) -> bool>,
+    /// Type of the input file
+    input_type: FileType,
+    /// Type of the output file, if any
+    output_type: Option<FileType>,
+}
+
+#[derive(Clone)]
+enum SpecTest {
+    ParserSuccess(TestFile, TestFile),
+    ParserFailure(TestFile, TestFile),
+    Printer(TestFile, TestFile),
+    BinaryEncoding(TestFile, TestFile),
+    BinaryDecodingSuccess(TestFile, TestFile),
+    BinaryDecodingFailure(TestFile, TestFile),
+    ImportSuccess(TestFile, TestFile),
+    ImportFailure(TestFile, TestFile),
+    SemanticHash(TestFile, TestFile),
+    TypeInferenceSuccess(TestFile, TestFile),
+    TypeInferenceFailure(TestFile, TestFile),
+    Normalization(TestFile, TestFile),
+    AlphaNormalization(TestFile, TestFile),
+}
+
+fn define_features() -> Vec<TestFeature> {
+    let default_feature = TestFeature {
+        module_name: "",
+        directory: "",
+        variant: Rc::new(|_, _| panic!()),
+        too_slow_path: Rc::new(|_path: &str| false),
+        exclude_path: Rc::new(|_path: &str| false),
+        input_type: FileType::Text,
+        output_type: None,
+    };
+
+    #[allow(clippy::nonminimal_bool)]
+    vec![
+        TestFeature {
+            module_name: "parser_success",
+            directory: "parser/success/",
+            variant: Rc::new(SpecTest::ParserSuccess),
+            too_slow_path: Rc::new(|path: &str| path == "largeExpression"),
+            exclude_path: Rc::new(|path: &str| {
+                false
+                    // Pretty sure the test is incorrect
+                    || path == "unit/import/urls/quotedPathFakeUrlEncode"
+            }),
+            output_type: Some(FileType::Binary),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "parser_failure",
+            directory: "parser/failure/",
+            variant: Rc::new(SpecTest::ParserFailure),
+            output_type: Some(FileType::UI),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "printer",
+            directory: "parser/success/",
+            variant: Rc::new(SpecTest::Printer),
+            too_slow_path: Rc::new(|path: &str| path == "largeExpression"),
+            output_type: Some(FileType::UI),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "binary_encoding",
+            directory: "parser/success/",
+            variant: Rc::new(SpecTest::BinaryEncoding),
+            too_slow_path: Rc::new(|path: &str| path == "largeExpression"),
+            exclude_path: Rc::new(|path: &str| {
+                false
+                    // Pretty sure the test is incorrect
+                    || path == "unit/import/urls/quotedPathFakeUrlEncode"
+                    // See https://github.com/pyfisch/cbor/issues/109
+                    || path == "double"
+                    || path == "unit/DoubleLitExponentNoDot"
+                    || path == "unit/DoubleLitSecretelyInt"
+            }),
+            output_type: Some(FileType::Binary),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "binary_decoding_success",
+            directory: "binary-decode/success/",
+            variant: Rc::new(SpecTest::BinaryDecodingSuccess),
+            exclude_path: Rc::new(|path: &str| {
+                false
+                    // We don't support bignums
+                    || path == "unit/IntegerBigNegative"
+                    || path == "unit/IntegerBigPositive"
+                    || path == "unit/NaturalBig"
+            }),
+            input_type: FileType::Binary,
+            output_type: Some(FileType::Text),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "binary_decoding_failure",
+            directory: "binary-decode/failure/",
+            variant: Rc::new(SpecTest::BinaryDecodingFailure),
+            input_type: FileType::Binary,
+            output_type: Some(FileType::UI),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "import_success",
+            directory: "import/success/",
+            variant: Rc::new(SpecTest::ImportSuccess),
+            exclude_path: Rc::new(|path: &str| {
+                false
+                    // TODO: import hash
+                    || path == "hashFromCache"
+                    // TODO: the standard does not respect https://tools.ietf.org/html/rfc3986#section-5.2
+                    || path == "unit/asLocation/RemoteCanonicalize4"
+                    // TODO: import headers
+                    || path == "customHeaders"
+                    || path == "headerForwarding"
+                    || path == "noHeaderForwarding"
+            }),
+            output_type: Some(FileType::Text),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "import_failure",
+            directory: "import/failure/",
+            variant: Rc::new(SpecTest::ImportFailure),
+            exclude_path: Rc::new(|path: &str| {
+                false
+                    // TODO: import headers
+                    || path == "customHeadersUsingBoundVariable"
+            }),
+            output_type: Some(FileType::UI),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "semantic_hash",
+            directory: "semantic-hash/success/",
+            variant: Rc::new(SpecTest::SemanticHash),
+            exclude_path: Rc::new(|path: &str| {
+                false
+                    // We don't support bignums
+                    || path == "simple/integerToDouble"
+                    // See https://github.com/pyfisch/cbor/issues/109
+                    || path == "prelude/Integer/toDouble/0"
+                    || path == "prelude/Integer/toDouble/1"
+                    || path == "prelude/Natural/toDouble/0"
+            }),
+            output_type: Some(FileType::Hash),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "beta_normalize",
+            directory: "normalization/success/",
+            variant: Rc::new(SpecTest::Normalization),
+            too_slow_path: Rc::new(|path: &str| path == "remoteSystems"),
+            exclude_path: Rc::new(|path: &str| {
+                false
+                    // Cannot typecheck
+                    || path == "unit/Sort"
+                    // We don't support bignums
+                    || path == "simple/integerToDouble"
+                    // TODO: fix Double/show
+                    || path == "prelude/JSON/number/1"
+            }),
+            output_type: Some(FileType::Text),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "alpha_normalize",
+            directory: "alpha-normalization/success/",
+            variant: Rc::new(SpecTest::AlphaNormalization),
+            exclude_path: Rc::new(|path: &str| {
+                // This test is designed to not typecheck
+                path == "unit/FunctionNestedBindingXXFree"
+            }),
+            output_type: Some(FileType::Text),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "type_inference_success",
+            directory: "type-inference/success/",
+            variant: Rc::new(SpecTest::TypeInferenceSuccess),
+            too_slow_path: Rc::new(|path: &str| path == "prelude"),
+            output_type: Some(FileType::Text),
+            ..default_feature.clone()
+        },
+        TestFeature {
+            module_name: "type_inference_failure",
+            directory: "type-inference/failure/",
+            variant: Rc::new(SpecTest::TypeInferenceFailure),
+            exclude_path: Rc::new(|path: &str| {
+                false
+                    // TODO: enable free variable checking
+                    || path == "unit/MergeHandlerFreeVar"
+            }),
+            output_type: Some(FileType::UI),
+            ..default_feature
+        },
+    ]
+}
+
+fn run_test_or_panic(test: &SpecTest) {
+    let res = if env::var("CI_GRCOV").is_ok() {
+        let test: SpecTest = test.clone();
+        // Augment stack size when running with 0 inlining to avoid overflows
+        std::thread::Builder::new()
+            .stack_size(128 * 1024 * 1024)
+            .spawn(move || run_test(&test))
+            .unwrap()
+            .join()
+            .unwrap()
+    } else {
+        run_test(test)
+    };
+    match res {
+        Ok(_) => {}
+        Err(e) => panic!(e.to_string()),
+    }
+}
+
+fn run_test(test: &SpecTest) -> Result<()> {
+    use self::SpecTest::*;
+    // Setup current directory to the root of the repository. Important for `as Location` tests.
+    env::set_current_dir(
+        PathBuf::from(env!("CARGO_MANIFEST_DIR")).parent().unwrap(),
+    )?;
+    // Set environment variable for import tests.
+    env::set_var("DHALL_TEST_VAR", "6 * 7");
+
+    match test {
+        ParserSuccess(expr, expected) => {
+            let expr = expr.parse()?;
+            // This exercices both parsing and binary decoding
+            expected.compare_debug(expr)?;
+        }
+        ParserFailure(expr, expected) => {
+            use std::io;
+            let err = expr.parse().unwrap_err();
+            match err.kind() {
+                ErrorKind::Parse(_) => {}
+                ErrorKind::IO(e) if e.kind() == io::ErrorKind::InvalidData => {}
+                e => panic!("Expected parse error, got: {:?}", e),
+            }
+            expected.compare_ui(err)?;
+        }
+        BinaryEncoding(expr, expected) => {
+            let expr = expr.parse()?;
+            expected.compare_binary(expr)?;
+        }
+        BinaryDecodingSuccess(expr, expected) => {
+            let expr = expr.parse()?;
+            expected.compare_debug(expr)?;
+        }
+        BinaryDecodingFailure(expr, expected) => {
+            let err = expr.parse().unwrap_err();
+            expected.compare_ui(err)?;
+        }
+        Printer(expr, expected) => {
+            let parsed = expr.parse()?;
+            // Round-trip pretty-printer
+            let reparsed = Parsed::parse_str(&parsed.to_string())?;
+            assert_eq!(reparsed, parsed);
+            expected.compare_ui(parsed)?;
+        }
+        ImportSuccess(expr, expected) => {
+            let expr = expr.normalize()?;
+            expected.compare(expr)?;
+        }
+        ImportFailure(expr, expected) => {
+            let err = expr.resolve().unwrap_err();
+            expected.compare_ui(err)?;
+        }
+        SemanticHash(expr, expected) => {
+            let expr = expr.normalize()?.to_expr_alpha();
+            let hash = hex::encode(expr.hash()?);
+            expected.compare_ui(format!("sha256:{}", hash))?;
+        }
+        TypeInferenceSuccess(expr, expected) => {
+            let ty = expr.typecheck()?.get_type()?;
+            expected.compare(ty)?;
+        }
+        TypeInferenceFailure(expr, expected) => {
+            let err = expr.typecheck().unwrap_err();
+            expected.compare_ui(err)?;
+        }
+        Normalization(expr, expected) => {
+            let expr = expr.normalize()?;
+            expected.compare(expr)?;
+        }
+        AlphaNormalization(expr, expected) => {
+            let expr = expr.normalize()?.to_expr_alpha();
+            expected.compare(expr)?;
+        }
+    }
+
+    Ok(())
+}
+
+fn dhall_files_in_dir<'a>(
+    dir: &'a Path,
+    take_ab_suffix: bool,
+    filetype: FileType,
+) -> impl Iterator<Item = (String, String)> + 'a {
+    WalkDir::new(dir)
+        .into_iter()
+        .filter_map(|e| e.ok())
+        .filter_map(move |path| {
+            let path = path.path().strip_prefix(dir).unwrap();
+            let ext = path.extension()?;
+            if *ext != OsString::from(filetype.to_ext()) {
+                return None;
+            }
+            let path = path.to_string_lossy();
+            let path = &path[..path.len() - 1 - ext.len()];
+            let path = if take_ab_suffix && &path[path.len() - 1..] != "A" {
+                return None;
+            } else if take_ab_suffix {
+                path[..path.len() - 1].to_owned()
+            } else {
+                path.to_owned()
+            };
+            // Transform path into a valid Rust identifier
+            let name = path.replace("/", "_").replace("-", "_");
+            Some((name, path))
+        })
+}
+
+fn make_test_module(
+    tests: &mut Vec<Test<SpecTest>>,
+    base_paths: &[&Path],
+    feature: TestFeature,
+) -> std::io::Result<()> {
+    let take_ab_suffix = feature.output_type.is_some()
+        && (feature.output_type != Some(FileType::UI)
+            || feature.module_name == "printer");
+    let input_suffix = if take_ab_suffix { "A" } else { "" };
+    let output_suffix = if take_ab_suffix { "B" } else { "" };
+
+    for base_path in base_paths {
+        let tests_dir = base_path.join(feature.directory);
+        for (name, path) in
+            dhall_files_in_dir(&tests_dir, take_ab_suffix, feature.input_type)
+        {
+            if (feature.exclude_path)(&path) {
+                continue;
+            }
+            if (feature.too_slow_path)(&path) {
+                #[cfg(debug_assertions)]
+                continue;
+            }
+            let path = tests_dir.join(path);
+            let path = path.to_string_lossy();
+
+            let input = feature
+                .input_type
+                .construct(&format!("{}{}", path, input_suffix));
+            let output = match feature.output_type {
+                None => None,
+                Some(output_type @ FileType::UI) => {
+                    // All ui outputs are in the local `tests/` directory.
+                    let path = PathBuf::from("tests/").join(
+                        PathBuf::from(path.as_ref())
+                            .strip_prefix(base_path)
+                            .unwrap(),
+                    );
+                    let path = path.to_str().unwrap();
+                    let output = output_type
+                        .construct(&format!("{}{}", path, output_suffix));
+                    Some(output)
+                }
+                Some(output_type) => {
+                    let output = output_type
+                        .construct(&format!("{}{}", path, output_suffix));
+                    Some(output)
+                }
+            };
+
+            let test = match output {
+                None => panic!(),
+                Some(output) => {
+                    (feature.variant)(input, output)
+                }
+            };
+            tests.push(Test {
+                name: format!("{}::{}", feature.module_name, name),
+                kind: "".into(),
+                is_ignored: false,
+                is_bench: false,
+                data: test,
+            });
+        }
+    }
+    Ok(())
+}
+
+fn generate_tests() -> Vec<Test<SpecTest>> {
+    let spec_tests_dirs =
+        vec![Path::new("../dhall-lang/tests/"), Path::new("tests/")];
+
+    let features = define_features();
+
+    let mut tests = Vec::new();
+    for feature in features {
+        make_test_module(&mut tests, &spec_tests_dirs, feature).unwrap();
+    }
+    tests
+}
+
+fn main() {
+    let tests = generate_tests();
+
+    let args = Arguments::from_args();
+    run_tests(&args, tests, |test| { run_test_or_panic(&test.data); Outcome::Passed }).exit();
+}