Add error types and core image types: ImageFormat, ImageSource, Dimensions, QualityPreset

pixstrip-core/tests/error_tests.rs

@@ -0,0 +1,46 @@
+use pixstrip_core::error::PixstripError;
+
+#[test]
+fn error_display_image_load() {
+    let err = PixstripError::ImageLoad {
+        path: "/tmp/bad.jpg".into(),
+        reason: "corrupt header".into(),
+    };
+    let msg = err.to_string();
+    assert!(msg.contains("/tmp/bad.jpg"));
+    assert!(msg.contains("corrupt header"));
+}
+
+#[test]
+fn error_display_unsupported_format() {
+    let err = PixstripError::UnsupportedFormat {
+        format: "bmp".into(),
+    };
+    assert!(err.to_string().contains("bmp"));
+}
+
+#[test]
+fn error_display_io() {
+    let io_err = std::io::Error::new(std::io::ErrorKind::NotFound, "file missing");
+    let err = PixstripError::Io(io_err);
+    assert!(err.to_string().contains("file missing"));
+}
+
+#[test]
+fn error_display_output_exists() {
+    let err = PixstripError::OutputExists {
+        path: "/tmp/out.jpg".into(),
+    };
+    assert!(err.to_string().contains("/tmp/out.jpg"));
+}
+
+#[test]
+fn error_display_processing() {
+    let err = PixstripError::Processing {
+        operation: "resize".into(),
+        reason: "invalid dimensions".into(),
+    };
+    let msg = err.to_string();
+    assert!(msg.contains("resize"));
+    assert!(msg.contains("invalid dimensions"));
+}