closureforloop_test.go

closureforloop_test.go

package closureforloop

import (
	"strings"
	"testing"
)

// exercising on: https://go.dev/blog/loopvar-preview
func TestHappens(t *testing.T) {
	tt := []struct {
		name  string
		lower string
		upper string
	}{
		{"test1", "a", "A"},
		{"test2", "z", "Z"},
	}
	{
		for testID, test := range tt {
			tf := func(t *testing.T) {
				t.Parallel()
				t.Logf("Test: %d name: %s for %s and %s", testID, test.name, test.lower, test.upper)

				if strings.ToUpper(test.lower) == test.upper {
					t.Logf("Should expect %s once uppercased is %s", test.lower, test.upper)
				} else {
					t.Errorf("Should expect %s once uppercased is %s", test.lower, test.upper)
				}
			}
			t.Run(test.name, tf)
		}
	}
	// We can notice is testing the second testtable row, twice:
	//
	// === NAME  TestHappens/test1
	// 	closureforloop_test.go:21: Test: 1 name: test2 for z and Z
	// 	closureforloop_test.go:24: Should expect z once uppercased is Z
	// === NAME  TestHappens/test2
	// 	closureforloop_test.go:21: Test: 1 name: test2 for z and Z
	// 	closureforloop_test.go:24: Should expect z once uppercased is Z
	// --- PASS: TestHappens (0.00s)
	// 	--- PASS: TestHappens/test1 (0.00s)
	// 	--- PASS: TestHappens/test2 (0.00s)
}