1package main
 2
 3import (
 4	"testing"
 5)
 6
 7func TestPerimeter(t *testing.T) {
 8	rectangle := Rectangle{10.0, 10.0}
 9	got := Perimeter(rectangle)
10	want := 40.0
11
12	if got != want {
13		t.Errorf("got %.2f want %.2f", got, want)
14	}
15}
16
17func TestArea(t *testing.T) {
18	tests := []struct {
19		name     string
20		shape    Shape
21		expected float64
22	}{
23		{name: "rectangles", shape: Rectangle{Width: 12, Height: 6}, expected: 72.0},
24		{name: "circles", shape: Circle{Radius: 10}, expected: 314.1592653589793},
25		{name: "triangles", shape: Triangle{Base: 12, Height: 6}, expected: 36.0},
26	}
27
28	for _, test := range tests {
29		t.Run(test.name, func(t *testing.T) {
30			got := test.shape.Area()
31			if got != test.expected {
32				t.Errorf("got %g want %g", got, test.expected)
33			}
34		})
35	}
36}