diff --git a/types/time/duration_test.go b/types/time/duration_test.go
new file mode 100644
index 00000000..1aa90bbf
--- /dev/null
+++ b/types/time/duration_test.go
@@ -0,0 +1,31 @@
+package time
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDurationPretty(t *testing.T) {
+	testCases := []struct {
+		jsonBytes []byte
+		expErr    bool
+		expValue  time.Duration
+	}{
+		{[]byte(`"10s"`), false, 10 * time.Second},
+		{[]byte(`"48h0m0s"`), false, 48 * time.Hour},
+		{[]byte(`"10kkk"`), true, 0},
+		{[]byte(`"kkk"`), true, 0},
+	}
+
+	for i, tc := range testCases {
+		var d DurationPretty
+		if tc.expErr {
+			assert.Error(t, d.UnmarshalJSON(tc.jsonBytes), "#%d", i)
+		} else {
+			assert.NoError(t, d.UnmarshalJSON(tc.jsonBytes), "#%d", i)
+			assert.Equal(t, tc.expValue, d.Duration, "#%d", i)
+		}
+	}
+}