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75 lines
1.9 KiB
Go
75 lines
1.9 KiB
Go
package structs
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import "testing"
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func TestPerimeter(t *testing.T) {
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rectangle := Rectangle{10.0, 10.0}
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got := Perimeter(rectangle)
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want := 40.0
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if got != want {
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t.Errorf("got %.2f want %.2f", got, want)
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}
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}
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// %.2f is replaced with %g which will print a more precise decimal number in an error message.
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func TestArea(t *testing.T) {
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// Helper function
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checkArea := func(t testing.TB, shape Shape, want float64) {
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t.Helper()
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got := shape.Area()
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if got != want {
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t.Errorf("got %g want %g", got, want)
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}
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}
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t.Run("area rectangle", func(t *testing.T) {
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rectangle := Rectangle{12.0, 6.0}
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checkArea(t, rectangle, 72.0)
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})
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t.Run("area circle", func(t *testing.T) {
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circle := Circle{10}
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checkArea(t, circle, 314.1592653589793)
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})
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}
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// https://go.dev/wiki/TableDrivenTests are useful when you want to build a list of test cases that can be tested in the same manner.
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// They are a great fit when you wish to test various implementations of an interface, or if the data being passed in to a function has lots of different requirements that need testing.
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func TestAreaTable(t *testing.T) {
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// "anonymous struct"
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areaTests := []struct {
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name string
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shape Shape
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want float64
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}{
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// example showing named arguments. Arguably it is more readable.
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{name: "Rectangle", shape: Rectangle{Width: 12, Height: 6}, want: 72.0},
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{"Circle", Circle{10}, 314.1592653589793},
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{"Triangle", Triangle{12, 6}, 36.0},
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}
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// for _, tt := range areaTests {
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// got := tt.shape.Area()
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// if got != tt.want {
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// // %#v format string will print out our struct with the values in its field
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// t.Errorf("%#v got %g want %g", tt, got, tt.want)
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// }
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//}
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// Wrap in t.Run for better debug output and test failure identification
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for _, tt := range areaTests {
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t.Run(tt.name, func(t *testing.T) {
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got := tt.shape.Area()
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if got != tt.want {
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t.Errorf("%#v got %g want %g", tt, got, tt.want)
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}
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})
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}
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}
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