fixup! test: Add some unit tests for cache

1 files changed, 55 insertions, 30 deletions

diff --git a/dhall/src/semantics/resolve/cache.rs b/dhall/src/semantics/resolve/cache.rs
index 212ea1b..5aa9ee2 100644
--- a/dhall/src/semantics/resolve/cache.rs
+++ b/dhall/src/semantics/resolve/cache.rs
@@ -8,9 +8,9 @@ use crate::semantics::{Import, TypedHir};
 use crate::syntax::Hash;
 use crate::syntax::{binary, Expr};
 use crate::Parsed;
-use std::fs::File;
 use std::env::VarError;
 use std::ffi::OsStr;
+use std::fs::File;
 
 #[cfg(unix)]
 const ALTERNATE_ENV_VAR: &str = "HOME";
@@ -18,21 +18,27 @@ const ALTERNATE_ENV_VAR: &str = "HOME";
 #[cfg(windows)]
 const ALTERNATE_ENV_VAR: &str = "LOCALAPPDATA";
 
-fn alternate_env_var_cache_dir(provider: impl Fn(&str) -> Result<String, VarError>) -> Option<PathBuf> {
+fn alternate_env_var_cache_dir(
+    provider: impl Fn(&str) -> Result<String, VarError>,
+) -> Option<PathBuf> {
     provider(ALTERNATE_ENV_VAR)
         .map(PathBuf::from)
         .map(|env_dir| env_dir.join(".cache").join("dhall"))
         .ok()
 }
 
-fn env_var_cache_dir(provider: impl Fn(&str) -> Result<String, VarError>) -> Option<PathBuf> {
+fn env_var_cache_dir(
+    provider: impl Fn(&str) -> Result<String, VarError>,
+) -> Option<PathBuf> {
     provider("XDG_CACHE_HOME")
         .map(PathBuf::from)
         .map(|cache_home| cache_home.join("dhall"))
         .ok()
 }
 
-fn load_cache_dir(provider: impl Fn(&str) -> Result<String, VarError> + Copy) -> Result<PathBuf, CacheError> {
+fn load_cache_dir(
+    provider: impl Fn(&str) -> Result<String, VarError> + Copy,
+) -> Result<PathBuf, CacheError> {
     env_var_cache_dir(provider)
         .or_else(|| alternate_env_var_cache_dir(provider))
         .ok_or(CacheError::MissingConfiguration)
@@ -44,7 +50,9 @@ pub struct Cache {
 }
 
 impl Cache {
-    fn new_with_provider(provider: impl Fn(&str) -> Result<String, VarError> + Copy) -> Cache {
+    fn new_with_provider(
+        provider: impl Fn(&str) -> Result<String, VarError> + Copy,
+    ) -> Cache {
         // Should warn that we can't initialize cache on error
         let cache_dir = load_cache_dir(provider).and_then(|path| {
             if !path.exists() {
@@ -168,14 +176,15 @@ impl AsRef<[u8]> for Hash {
 #[cfg(test)]
 mod test {
     use super::*;
-    use std::env::temp_dir;
-    use rand::Rng;
     use rand::distributions::Alphanumeric;
+    use rand::Rng;
+    use std::env::temp_dir;
 
     #[cfg(unix)]
     #[test]
     fn alternate_env_var_cache_dir_should_result_unix_folder_path() {
-        let actual = alternate_env_var_cache_dir(|_| Ok("/home/user".to_string()));
+        let actual =
+            alternate_env_var_cache_dir(|_| Ok("/home/user".to_string()));
         assert_eq!(actual, Some(PathBuf::from("/home/user/.cache/dhall")));
     }
 
@@ -187,8 +196,13 @@ mod test {
 
     #[test]
     fn env_var_cache_dir_should_result_xdg_cache_home() {
-        let actual = env_var_cache_dir(|_| Ok("/home/user/custom/path/for/cache".to_string()));
-        assert_eq!(actual, Some(PathBuf::from("/home/user/custom/path/for/cache/dhall")));
+        let actual = env_var_cache_dir(|_| {
+            Ok("/home/user/custom/path/for/cache".to_string())
+        });
+        assert_eq!(
+            actual,
+            Some(PathBuf::from("/home/user/custom/path/for/cache/dhall"))
+        );
     }
 
     #[test]
@@ -199,31 +213,30 @@ mod test {
 
     #[test]
     fn load_cache_dir_should_result_xdg_cache_first() {
-        let actual = load_cache_dir(
-            |var| match var {
-                "XDG_CACHE_HOME" => Ok("/home/user/custom".to_string()),
-                _ => Err(VarError::NotPresent)
-            }
-        );
+        let actual = load_cache_dir(|var| match var {
+            "XDG_CACHE_HOME" => Ok("/home/user/custom".to_string()),
+            _ => Err(VarError::NotPresent),
+        });
         assert_eq!(actual.unwrap(), PathBuf::from("/home/user/custom/dhall"));
     }
 
     #[cfg(unix)]
     #[test]
     fn load_cache_dir_should_result_alternate() {
-        let actual = load_cache_dir(|var|
-            match var {
-                ALTERNATE_ENV_VAR => Ok("/home/user".to_string()),
-                _ => Err(VarError::NotPresent)
-            }
-        );
+        let actual = load_cache_dir(|var| match var {
+            ALTERNATE_ENV_VAR => Ok("/home/user".to_string()),
+            _ => Err(VarError::NotPresent),
+        });
         assert_eq!(actual.unwrap(), PathBuf::from("/home/user/.cache/dhall"));
     }
 
     #[test]
     fn load_cache_dir_should_result_none() {
         let actual = load_cache_dir(|_| Err(VarError::NotPresent));
-        assert!(matches!(actual.unwrap_err(), CacheError::MissingConfiguration));
+        assert!(matches!(
+            actual.unwrap_err(),
+            CacheError::MissingConfiguration
+        ));
     }
 
     #[test]
@@ -236,8 +249,15 @@ mod test {
 
         std::fs::create_dir_all(dir.as_path()).unwrap();
 
-        let actual = Cache::new_with_provider(|_| Ok(dir.clone().to_str().map(String::from).unwrap()));
-        assert_eq!(actual, Cache{ cache_dir: Some(dir.join("dhall"))});
+        let actual = Cache::new_with_provider(|_| {
+            Ok(dir.clone().to_str().map(String::from).unwrap())
+        });
+        assert_eq!(
+            actual,
+            Cache {
+                cache_dir: Some(dir.join("dhall"))
+            }
+        );
         assert!(dir.join("dhall").exists());
         std::fs::remove_dir_all(dir.as_path()).unwrap();
     }
@@ -255,10 +275,15 @@ mod test {
 
         assert!(dir.join("dhall").exists());
 
-        let actual = Cache::new_with_provider(|_| Ok(dir.clone().to_str().map(String::from).unwrap()));
-        assert_eq!(actual, Cache{ cache_dir: Some(dir.join("dhall"))});
+        let actual = Cache::new_with_provider(|_| {
+            Ok(dir.clone().to_str().map(String::from).unwrap())
+        });
+        assert_eq!(
+            actual,
+            Cache {
+                cache_dir: Some(dir.join("dhall"))
+            }
+        );
         std::fs::remove_dir_all(dir.as_path()).unwrap();
     }
-
-
-}
\ No newline at end of file
+}