chore: remove unnecessary conversions from tests (#370)

Author: estensen

Diff for: types_test.go

@@ -28,7 +28,7 @@ func TestNumericDate(t *testing.T) {
 	b, _ := json.Marshal(s)
 
 	if raw != string(b) {
-		t.Errorf("Serialized format of numeric date mismatch. Expecting: %s  Got: %s", string(raw), string(b))
+		t.Errorf("Serialized format of numeric date mismatch. Expecting: %s  Got: %s", raw, string(b))
 	}
 
 	jwt.TimePrecision = oldPrecision
@@ -46,7 +46,7 @@ func TestSingleArrayMarshal(t *testing.T) {
 	}
 
 	if expected != string(b) {
-		t.Errorf("Serialized format of string array mismatch. Expecting: %s  Got: %s", string(expected), string(b))
+		t.Errorf("Serialized format of string array mismatch. Expecting: %s  Got: %s", expected, string(b))
 	}
 
 	jwt.MarshalSingleStringAsArray = true
@@ -60,7 +60,7 @@ func TestSingleArrayMarshal(t *testing.T) {
 	}
 
 	if expected != string(b) {
-		t.Errorf("Serialized format of string array mismatch. Expecting: %s  Got: %s", string(expected), string(b))
+		t.Errorf("Serialized format of string array mismatch. Expecting: %s  Got: %s", expected, string(b))
 	}
 }