Re-add save tests

src/core/database/json/mod.rs

@@ -69,6 +69,8 @@ pub mod testmod;
 mod tests {
     use std::collections::HashMap;
 
+    use mockall::predicate;
+
     use crate::core::{
         collection::{artist::Artist, Collection},
         testmod::FULL_COLLECTION,
@@ -85,7 +87,20 @@ mod tests {
         expected
     }
 
-    // FIXME: Re-add save() test.
+    #[test]
+    fn save() {
+        let write_data = FULL_COLLECTION.to_owned();
+        let input = DATABASE_JSON.to_owned();
+
+        let mut backend = MockIJsonDatabaseBackend::new();
+        backend
+            .expect_write()
+            .with(predicate::eq(input))
+            .times(1)
+            .return_once(|_| Ok(()));
+
+        JsonDatabase::new(backend).save(&write_data).unwrap();
+    }
 
     #[test]
     fn load() {
@@ -102,25 +117,16 @@ mod tests {
 
     #[test]
     fn reverse() {
-        // Saving is non-deterministic due to HashMap, but regardless of how the data ends up being
-        // saved, loading it again should always yield the exact same data as was input.
-        // FIXME: remove and replace with mocks now that indeterminism is not a problem.
-        struct MockIJsonDatabaseBackend {
-            data: Option<String>,
-        }
+        let input = DATABASE_JSON.to_owned();
+        let result = Ok(input.clone());
 
-        impl IJsonDatabaseBackend for MockIJsonDatabaseBackend {
-            fn write(&mut self, json: &str) -> Result<(), std::io::Error> {
-                let _ = self.data.insert(json.to_owned());
-                Ok(())
-            }
-
-            fn read(&self) -> Result<String, std::io::Error> {
-                Ok(self.data.as_ref().unwrap().clone())
-            }
-        }
-
-        let backend = MockIJsonDatabaseBackend { data: None };
+        let mut backend = MockIJsonDatabaseBackend::new();
+        backend
+            .expect_write()
+            .with(predicate::eq(input))
+            .times(1)
+            .return_once(|_| Ok(()));
+        backend.expect_read().times(1).return_once(|| result);
         let mut database = JsonDatabase::new(backend);
 
         let write_data = FULL_COLLECTION.to_owned();

src/core/database/json/testmod.rs

@@ -1,5 +1,5 @@
 pub static DATABASE_JSON: &str = "{\
-    \"V20240210\":
+    \"V20240210\":\
     [\
     {\
     \"name\":\"album_artist a\",\

tests/database/json.rs

@@ -24,7 +24,21 @@ fn expected() -> Collection {
     expected
 }
 
-// FIXME: Re-add save test.
+#[test]
+fn save() {
+    let file = NamedTempFile::new().unwrap();
+
+    let backend = JsonDatabaseFileBackend::new(file.path());
+    let mut database = JsonDatabase::new(backend);
+
+    let write_data = COLLECTION.to_owned();
+    database.save(&write_data).unwrap();
+
+    let expected = fs::read_to_string(&*DATABASE_TEST_FILE).unwrap();
+    let actual = fs::read_to_string(file.path()).unwrap();
+
+    assert_eq!(actual, expected);
+}
 
 #[test]
 fn load() {
@@ -39,8 +53,6 @@ fn load() {
 
 #[test]
 fn reverse() {
-    // Saving is non-deterministic due to HashMap, but regardless of how the data ends up being
-    // saved, loading it again should always yield the exact same data as was input.
     let file = NamedTempFile::new().unwrap();
 
     let backend = JsonDatabaseFileBackend::new(file.path());