Function TestMutateErrorMulti

internal/source/mutate_test.go:179–210

TestMutateErrorMulti tests error that can only happen across multiple errors

(t *testing.T)

// TestMutateErrorMulti tests error that can only happen across multiple errors
func TestMutateErrorMulti(t *testing.T) {
	type test struct {
		input string
		edit1 Edit
		edit2 Edit
	}

	tests := []test{
		// These edits overlap each other, and are therefore undefined
		{"abcdef", newEdit(0, "a", ""), newEdit(0, "a", "A")},
		{"abcdef", newEdit(0, "ab", ""), newEdit(1, "ab", "AB")},
		{"abcdef", newEdit(0, "abc", ""), newEdit(2, "abc", "ABC")},

		// the last edit is longer than the string itself
		{"abcdef", newEdit(0, "abcdefghi", ""), newEdit(2, "abc", "ABC")},

		// negative indexes
		{"abcdef", newEdit(-1, "abc", ""), newEdit(3, "abc", "ABC")},
		{"abcdef", newEdit(0, "abc", ""), newEdit(-1, "abc", "ABC")},
	}

	for _, spec := range tests {
		actual, err := Mutate(spec.input, []Edit{spec.edit1, spec.edit2})
		testName := fmt.Sprintf("Mutate(%s, Edits{(%v, %v -> %v), (%v, %v -> %v)})", spec.input,
			spec.edit1.Location, spec.edit1.Old, spec.edit1.New,
			spec.edit2.Location, spec.edit2.Old, spec.edit2.New)

		if err == nil {
			t.Errorf("%s should error, but got (%v)", testName, actual)
		}
	}
}