code refactor

Reviewed-on: #26

crates/adapters/image-converter/tests/conversion_config_test.rs

@@ -0,0 +1,54 @@
+use image_converter::{ConversionConfig, Format};
+
+fn section(enabled: bool, format: Option<&str>) -> config::ImageConversionConfig {
+    config::ImageConversionConfig {
+        enabled,
+        format: format.map(str::to_owned),
+    }
+}
+
+fn convert(enabled: bool, format: Option<&str>) -> anyhow::Result<Option<ConversionConfig>> {
+    ConversionConfig::from_config(&section(enabled, format))
+}
+
+#[test]
+fn is_disabled_by_default() {
+    assert!(
+        ConversionConfig::from_config(&config::ImageConversionConfig::default())
+            .unwrap()
+            .is_none()
+    );
+    assert!(convert(false, Some("webp")).unwrap().is_none());
+}
+
+#[test]
+fn enabled_with_avif_format() {
+    let cfg = convert(true, Some("avif")).unwrap().unwrap();
+    assert_eq!(cfg.format, Format::Avif);
+}
+
+#[test]
+fn enabled_with_webp_format() {
+    let cfg = convert(true, Some("webp")).unwrap().unwrap();
+    assert_eq!(cfg.format, Format::Webp);
+}
+
+#[test]
+fn unknown_format_is_rejected() {
+    assert!(convert(true, Some("gif")).is_err());
+}
+
+#[test]
+fn missing_format_when_enabled_is_rejected() {
+    assert!(convert(true, None).is_err());
+}
+
+#[test]
+fn avif_extension_is_dot_avif() {
+    assert_eq!(Format::Avif.extension(), ".avif");
+}
+
+#[test]
+fn webp_extension_is_dot_webp() {
+    assert_eq!(Format::Webp.extension(), ".webp");
+}