✨ (clockface): add sample for unit circle

Author: yuanyu90221

clockface/clockface.go

@@ -28,3 +28,7 @@ func simpleTime(hours, minutes, seconds int) time.Time {
 func testName(t time.Time) string {
 	return t.Format("15:04:05")
 }
+
+func secondHandPoint(t time.Time) Point {
+	return Point{0, -1}
+}

clockface/clockface_test.go

@@ -26,3 +26,21 @@ func TestSecondsInRadians(t *testing.T) {
 		})
 	}
 }
+
+func TestSecondHandPoint(t *testing.T) {
+	cases := []struct {
+		time  time.Time
+		point Point
+	}{
+		{simpleTime(0, 0, 30), Point{0, -1}},
+	}
+
+	for _, c := range cases {
+		t.Run(testName(c.time), func(t *testing.T) {
+			got := secondHandPoint(c.time)
+			if got != c.point {
+				t.Fatalf("Wanted %v Point, but got %v", c.point, got)
+			}
+		})
+	}
+}