1 files changed, 97 insertions, 0 deletions
diff --git a/stdlib/source/spec/lux/world/shell.lux b/stdlib/source/spec/lux/world/shell.lux
new file mode 100644
index 000000000..286cc7ce2
--- /dev/null
+++ b/stdlib/source/spec/lux/world/shell.lux
@@ -0,0 +1,97 @@
+(.module:
+  [lux #*
+   ["_" test (#+ Test)]
+   [abstract
+    [monad (#+ do)]]
+   [control
+    ["." try]
+    [security
+     ["!" capability]]
+    [concurrency
+     ["." promise (#+ Promise)]]]
+   [data
+    ["." product]
+    ["." text ("#@." equivalence)
+     ["%" format (#+ format)]]
+    [number
+     ["n" nat]
+     ["i" int]]
+    [format
+     ["." context]]]
+   [math
+    ["." random]]]
+  {1
+   ["." /]})
+
+(template [<name> <command> <type> <prep>]
+  [(def: <name>
+     (-> <type> [/.Environment /.Command (List /.Argument)])
+     (|>> <prep> list [context.empty <command>]))]
+
+  [echo! "echo" Text (|>)]
+  [sleep! "sleep" Nat %.nat]
+  )
+
+(def: (read-test expected process)
+  (-> Text (/.Process Promise) _.Assertion)
+  (do promise.monad
+    [?read (!.use (:: process read) [])
+     ?await (!.use (:: process await) [])]
+    ($_ _.and'
+        (_.claim [/.Can-Read]
+                 (case ?read
+                   (#try.Success actual)
+                   (text@= expected actual)
+                   
+                   (#try.Failure error)
+                   false))
+        (_.claim [/.Can-Wait /.Exit /.normal]
+                 (case ?await
+                   (#try.Success exit)
+                   (i.= /.normal exit)
+                   
+                   (#try.Failure error)
+                   false))
+        )))
+
+(def: (destroy-test process)
+  (-> (/.Process Promise) _.Assertion)
+  (do promise.monad
+    [?destroy (!.use (:: process destroy) [])
+     ?await (!.use (:: process await) [])]
+    (_.claim [/.Can-Destroy]
+             (and (case ?destroy
+                    (#try.Success _)
+                    true
+                    
+                    (#try.Failure error)
+                    false)
+                  (case ?await
+                    (#try.Success _)
+                    false
+                    
+                    (#try.Failure error)
+                    true)))))
+
+(with-expansions [<shell-coverage> (as-is [/.Can-Execute
+                                           /.Environment /.Command /.Argument])]
+  (def: #export (spec shell)
+    (-> (/.Shell Promise) Test)
+    (<| (_.with-cover [/.Shell /.Process])
+        (do {! random.monad}
+          [message (random.ascii/alpha 10)
+           seconds (:: ! map (|>> (n.% 5) (n.+ 5)) random.nat)]
+          (wrap (do promise.monad
+                  [?echo (!.use (:: shell execute) (..echo! message))
+                   ?sleep (!.use (:: shell execute) (..sleep! seconds))]
+                  (case [?echo ?sleep]
+                    [(#try.Success echo) (#try.Success sleep)]
+                    ($_ _.and'
+                        (_.claim <shell-coverage>
+                                 true)
+                        (..read-test message echo)
+                        (..destroy-test sleep))
+                    
+                    _
+                    (_.claim <shell-coverage>
+                             false))))))))