✨ (clockface): add secondsInRadians sample

Author: yuanyu90221

clockface/clockface.go

@@ -0,0 +1,22 @@
+package clockface
+
+import (
+	"math"
+	"time"
+)
+
+// A Point represents a two-dimensional Cartesian coordinate
+type Point struct {
+	X float64
+	Y float64
+}
+
+// SecondHand is the unit vector of the second hand of an analogue clock at time `t`
+// represented as a Point
+func SecondHand(t time.Time) Point {
+	return Point{150, 60}
+}
+
+func secondsInRadians(t time.Time) float64 {
+	return math.Pi
+}

clockface/clockface_test.go

@@ -0,0 +1,39 @@
+package clockface
+
+import (
+	"math"
+	"testing"
+	"time"
+)
+
+func TestSecondHandAtMidnight(t *testing.T) {
+	tm := time.Date(1337, time.January, 1, 0, 0, 0, 0, time.UTC)
+
+	want := Point{X: 150, Y: 150 - 90}
+	got := SecondHand(tm)
+
+	if got != want {
+		t.Errorf("Got %v, wanted %v", got, want)
+	}
+}
+
+// func TestSecondHandAt30Seconds(t *testing.T) {
+// 	tm := time.Date(1337, time.January, 1, 0, 0, 30, 0, time.UTC)
+
+// 	want := clockface.Point{X: 150, Y: 150 + 90}
+// 	got := clockface.SecondHand(tm)
+
+// 	if got != want {
+// 		t.Errorf("got %v, wanted %v", got, want)
+// 	}
+// }
+
+func TestSecondsInRadians(t *testing.T) {
+	thirtySeconds := time.Date(312, time.October, 28, 0, 0, 30, 0, time.UTC)
+	want := math.Pi
+	got := secondsInRadians(thirtySeconds)
+
+	if want != got {
+		t.Fatalf("Wanted %v radians, but got %v", want, got)
+	}
+}