Testing

Vanilla GO includes testing
A test is a file with suffix_test.go
You define functions with prefix Test and with an special signature receiving a *testing.T argument
You can create subtests as goroutines
You use CLI with go test
TableDrivenTest Design Pattern
Fuzzing
Automated testing that manipulates inputs to find bugs. Go fuzzing uses converage guaidance to find failures and is valuable in detection security exploits and vulnerabilities.

Example


func TestMergeSort(t *testing.T) {
	var tests = []struct {
		input    []int
		expected []int
	}{
		{[]int{5, 2, 8, 3, 1, 9, 4, 7, 6}, []int{1, 2, 3, 4, 5, 6, 7, 8, 9}},
		{[]int{1, 2, 3, 4, 5, 6, 7, 8, 9}, []int{1, 2, 3, 4, 5, 6, 7, 8, 9}},
		{[]int{9, 8, 7, 6, 5, 4, 3, 2, 1}, []int{1, 2, 3, 4, 5, 6, 7, 8, 9}},
		{[]int{9, 4, 5, 3, 2, 1}, []int{1, 2, 3, 4, 5, 9}},
		{[]int{}, []int{}},
		{[]int{1}, []int{1}},
	}
	for _, tt := range tests {
		res := mergeSort(tt.input)
		if !reflect.DeepEqual(res, tt.expected) {
			t.Errorf("got = %v, expected %v", tt.input, tt.expected)
		}
	}
}