Function TestCreateError

expfmt/text_create_test.go:726–788

(t *testing.T)

}

func TestCreateError(t *testing.T) {
	scenarios := []struct {
		in  *dto.MetricFamily
		err string
	}{
		// 0: No metric.
		{
			in: &dto.MetricFamily{
				Name:   proto.String("name"),
				Help:   proto.String("doc string"),
				Type:   dto.MetricType_COUNTER.Enum(),
				Metric: []*dto.Metric{},
			},
			err: "MetricFamily has no metrics",
		},
		// 1: No metric name.
		{
			in: &dto.MetricFamily{
				Help: proto.String("doc string"),
				Type: dto.MetricType_UNTYPED.Enum(),
				Metric: []*dto.Metric{
					{
						Untyped: &dto.Untyped{
							Value: proto.Float64(math.Inf(-1)),
						},
					},
				},
			},
			err: "MetricFamily has no name",
		},
		// 2: Wrong type.
		{
			in: &dto.MetricFamily{
				Name: proto.String("name"),
				Help: proto.String("doc string"),
				Type: dto.MetricType_COUNTER.Enum(),
				Metric: []*dto.Metric{
					{
						Untyped: &dto.Untyped{
							Value: proto.Float64(math.Inf(-1)),
						},
					},
				},
			},
			err: "expected counter in metric",
		},
	}

	for i, scenario := range scenarios {
		var out bytes.Buffer
		_, err := MetricFamilyToText(&out, scenario.in)
		if err == nil {
			t.Errorf("%d. expected error, got nil", i)
			continue
		}
		if expected, got := scenario.err, err.Error(); strings.Index(got, expected) != 0 {
			t.Errorf(
				"%d. expected error starting with %q, got %q",