Function TestInvalidHandlers

lambda/handler_test.go:23–152

(t *testing.T)

)

func TestInvalidHandlers(t *testing.T) {
	type valuer interface {
		Value(key interface{}) interface{}
	}

	type customContext interface {
		context.Context
		MyCustomMethod()
	}

	type myContext interface {
		Deadline() (deadline time.Time, ok bool)
		Done() <-chan struct{}
		Err() error
		Value(key interface{}) interface{}
	}

	testCases := []struct {
		name     string
		handler  interface{}
		expected error
	}{
		{
			name:     "nil handler",
			expected: errors.New("handler is nil"),
			handler:  nil,
		},
		{
			name:     "handler is not a function",
			expected: errors.New("handler kind struct is not func"),
			handler:  struct{}{},
		},
		{
			name:     "handler declares too many arguments",
			expected: errors.New("handlers may not take more than two arguments, but handler takes 3"),
			handler: func(n context.Context, x string, y string) error {
				return nil
			},
		},
		{
			name:     "two argument handler does not context as first argument",
			expected: errors.New("handler takes two arguments, but the first is not Context. got string"),
			handler: func(a string, x context.Context) error {
				return nil
			},
		},
		{
			name:     "handler returns too many values",
			expected: errors.New("handler may not return more than two values"),
			handler: func() (error, error, error) {
				return nil, nil, nil
			},
		},
		{
			name:     "handler returning two values does not declare error as the second return value",
			expected: errors.New("handler returns two values, but the second does not implement error"),
			//nolint: staticcheck
			handler: func() (error, string) {