testing some error handling

internal/plugin/interface.go

@@ -45,6 +45,9 @@ func RegisterPlugin(plugin Plugin) error {
 
 func compileSourceType(source data.Source) (data.Source, error) {
 	if source.SourceType != nil {
+		if _, ok := namePlugins[source.SourceType.Name]; !ok {
+			return source, errors.New("source type " + source.SourceType.Name + " not found")
+		}
 		return source, nil
 	}
 

internal/plugin/plugin_test.go

@@ -141,3 +141,30 @@ func TestFetchArtist(t *testing.T) {
 		t.Errorf(`didn't correctly parse the name`)
 	}
 }
+
+func TestFetchWrongUrl(t *testing.T) {
+	RegisterPlugin(MusifyTest{})
+
+	_, err := Fetch(data.Source{
+		Url: "https://musify.club/",
+	})
+
+	if err == nil {
+		t.Errorf(`trying to fetch an unknown url should result in error`)
+	}
+}
+
+func TestNonExistentSourceType(t *testing.T) {
+	RegisterPlugin(MusifyTest{})
+
+	_, err := Fetch(data.Source{
+		Url: "https://musify.club/",
+		SourceType: &data.SourceType{
+			Name: "doesn't exist",
+		},
+	})
+
+	if err == nil {
+		t.Errorf(`trying to fetch a not recognized source type should result in error`)
+	}
+}