Test extracting an image

tests/test_processing.rs

@@ -7,24 +7,29 @@ use tempfile::TempDir;
 use id3_image::*;
 
 struct Fixture {
-    path_buf: PathBuf,
+    path: PathBuf,
+    source: PathBuf,
     _tempdir: TempDir,
 }
 
 impl Fixture {
-    fn new(fixture_filename: &str) -> Self {
+    fn blank(fixture_filename: &str) -> Self {
         let root_dir = &env::var("CARGO_MANIFEST_DIR").expect("$CARGO_MANIFEST_DIR");
-        let mut source_path = PathBuf::from(root_dir);
-        source_path.push("tests/fixtures");
-        source_path.push(&fixture_filename);
+        let mut source = PathBuf::from(root_dir);
+        source.push("tests/fixtures");
+        source.push(&fixture_filename);
 
         let tempdir = tempfile::tempdir().unwrap();
-        let mut target_path = PathBuf::from(&tempdir.path());
-        target_path.push(&fixture_filename);
+        let mut path = PathBuf::from(&tempdir.path());
+        path.push(&fixture_filename);
 
-        fs::copy(&source_path, &target_path).unwrap();
+        Fixture { _tempdir: tempdir, source, path }
+    }
 
-        Fixture { _tempdir: tempdir, path_buf: target_path }
+    fn copy(fixture_filename: &str) -> Self {
+        let fixture = Fixture::blank(fixture_filename);
+        fs::copy(&fixture.source, &fixture.path).unwrap();
+        fixture
     }
 }
 
@@ -32,7 +37,7 @@ impl Deref for Fixture {
     type Target = Path;
 
     fn deref(&self) -> &Self::Target {
-        self.path_buf.deref()
+        self.path.deref()
     }
 }
 
@@ -42,8 +47,8 @@ fn read_tag(path: &Path) -> id3::Tag {
 
 #[test]
 fn test_unsuccessful_image_embedding() {
-    let song  = Fixture::new("attempt_1_no_image.mp3");
-    let image = Fixture::new("attempt_1.jpg");
+    let song  = Fixture::copy("attempt_1_no_image.mp3");
+    let image = Fixture::copy("attempt_1.jpg");
 
     // Nonexistent files
     assert!(embed_image(&song, &PathBuf::from("nonexistent.jpg")).is_err());
@@ -58,8 +63,8 @@ fn test_unsuccessful_image_embedding() {
 
 #[test]
 fn test_successful_jpeg_image_embedding() {
-    let song  = Fixture::new("attempt_1_no_image.mp3");
-    let image = Fixture::new("attempt_1.jpg");
+    let song  = Fixture::copy("attempt_1_no_image.mp3");
+    let image = Fixture::copy("attempt_1.jpg");
 
     let tag = read_tag(&song);
     assert!(tag.pictures().count() == 0);
@@ -72,8 +77,8 @@ fn test_successful_jpeg_image_embedding() {
 
 #[test]
 fn test_successful_png_image_embedding() {
-    let song  = Fixture::new("attempt_1_no_image.mp3");
-    let image = Fixture::new("attempt_1.png");
+    let song  = Fixture::copy("attempt_1_no_image.mp3");
+    let image = Fixture::copy("attempt_1.png");
 
     let tag = read_tag(&song);
     assert!(tag.pictures().count() == 0);
@@ -86,8 +91,8 @@ fn test_successful_png_image_embedding() {
 
 #[test]
 fn test_successful_image_embedding_in_a_file_that_already_has_an_image() {
-    let song  = Fixture::new("attempt_1.mp3");
-    let image = Fixture::new("attempt_1.jpg");
+    let song  = Fixture::copy("attempt_1.mp3");
+    let image = Fixture::copy("attempt_1.jpg");
 
     let tag = read_tag(&song);
     assert!(tag.pictures().count() > 0);
@@ -99,9 +104,9 @@ fn test_successful_image_embedding_in_a_file_that_already_has_an_image() {
 }
 
 #[test]
-fn test_remove_and_add_image() {
-    let song  = Fixture::new("attempt_1.mp3");
-    let image = Fixture::new("attempt_1.jpg");
+fn test_removing_and_adding_an_image() {
+    let song  = Fixture::copy("attempt_1.mp3");
+    let image = Fixture::copy("attempt_1.jpg");
 
     let tag = read_tag(&song);
     assert!(tag.pictures().count() > 0);
@@ -116,3 +121,45 @@ fn test_remove_and_add_image() {
     let tag = read_tag(&song);
     assert!(tag.pictures().count() > 0);
 }
+
+#[test]
+fn test_extracting_a_jpg_image() {
+    let song  = Fixture::copy("attempt_1.mp3");
+    let image = Fixture::blank("attempt_1.jpg");
+
+    let tag = read_tag(&song);
+    assert!(tag.pictures().count() > 0);
+    assert!(!image.exists());
+
+    extract_first_image(&song, &image).unwrap();
+
+    assert!(image.exists());
+}
+
+#[test]
+fn test_extracting_a_png_image() {
+    let song  = Fixture::copy("attempt_1.mp3");
+    let image = Fixture::blank("attempt_1.png");
+
+    let tag = read_tag(&song);
+    assert!(tag.pictures().count() > 0);
+    assert!(!image.exists());
+
+    extract_first_image(&song, &image).unwrap();
+
+    assert!(image.exists());
+}
+
+#[test]
+fn test_overwriting_an_existing_image() {
+    let song  = Fixture::copy("attempt_1.mp3");
+    let image = Fixture::copy("attempt_1.jpg");
+
+    let tag = read_tag(&song);
+    assert!(tag.pictures().count() > 0);
+    assert!(image.exists());
+
+    extract_first_image(&song, &image).unwrap();
+
+    assert!(image.exists());
+}