go-by-test/shapes/shapes_test.go

package shapes

import "testing"

func TestPerimeter(t *testing.T) {
	rectangle := Rectangle{30.5, 20.5}
	got := rectangle.Perimeter()
	exp := 102.0

	if got != exp {
		t.Errorf("got %.2f expected %.2f", got, exp)
	}
}

func TestArea(t *testing.T) {
	areaTests := []struct {
		name    string
		shape   Shape
		hasArea float64
	}{
		{name: "Rectangle", shape: Rectangle{Width: 30.5, Height: 20.5}, hasArea: 625.25},
		{name: "Circle", shape: Circle{Radius: 10}, hasArea: 314.1592653589793},
		{name: "Triangle", shape: Triangle{Width: 12, Height: 6}, hasArea: 36.0},
	}

	for _, test := range areaTests {
		t.Run(test.name, func(t *testing.T) {
			got := test.shape.Area()
			if got != test.hasArea {
				t.Errorf("%#v got %g expected %g", test.shape, got, test.hasArea)
			}
		})
	}
}