add const

server/ids/ids_test.go

@@ -0,0 +1,35 @@
+package ids
+
+import (
+	"errors"
+	"testing"
+)
+
+func TestParse(t *testing.T) {
+	tcases := []struct {
+		param    string
+		expType  ID
+		expValue int
+		expErr   error
+	}{
+		{param: "al-45", expType: Album, expValue: 45},
+		{param: "ar-2", expType: Artist, expValue: 2},
+		{param: "tr-43", expType: Track, expValue: 43},
+		{param: "xx-1", expErr: ErrBadPrefix},
+		{param: "al-howdy", expErr: ErrNotAnInt},
+	}
+	for _, tcase := range tcases {
+		t.Run(tcase.param, func(t *testing.T) {
+			act, err := Parse(tcase.param)
+			if !errors.Is(err, tcase.expErr) {
+				t.Fatalf("expected err %q, got %q", tcase.expErr, err)
+			}
+			if act.Value != tcase.expValue {
+				t.Errorf("expected value %d, got %d", tcase.expValue, act.Value)
+			}
+			if act.Type != tcase.expType {
+				t.Errorf("expected type %v, got %v", tcase.expType, act.Type)
+			}
+		})
+	}
+}