Merge pull request #499 from PhilipGough/fixes-498

Fixes 498
This commit is contained in:
Björn Rabenstein 2018-11-15 18:39:11 +01:00 committed by GitHub
commit 220bcf5e32
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 86 additions and 13 deletions

View File

@ -138,20 +138,13 @@ func GatherAndCompare(g prometheus.Gatherer, expected io.Reader, metricNames ...
}
want := internal.NormalizeMetricFamilies(wantRaw)
if len(got) != len(want) {
return notMatchingError(got, want)
}
for i := range got {
if got[i].String() != want[i].String() {
return notMatchingError(got, want)
}
}
return nil
return compare(got, want)
}
// notMatchingError encodes both provided slices of metric families into the
// text format and creates a readable error message from the result.
func notMatchingError(got, want []*dto.MetricFamily) error {
// compare encodes both provided slices of metric families into the text format,
// compares their string message, and returns an error if they do not match.
// The error contains the encoded text, of both the desired, and actual result.
func compare(got, want []*dto.MetricFamily) error {
var gotBuf, wantBuf bytes.Buffer
enc := expfmt.NewEncoder(&gotBuf, expfmt.FmtText)
for _, mf := range got {
@ -166,7 +159,8 @@ func notMatchingError(got, want []*dto.MetricFamily) error {
}
}
return fmt.Errorf(`
if wantBuf.String() != gotBuf.String() {
return fmt.Errorf(`
metric output does not match expectation; want:
%s
@ -175,6 +169,9 @@ got:
%s
`, wantBuf.String(), gotBuf.String())
}
return nil
}
func filterMetrics(metrics []*dto.MetricFamily, names []string) []*dto.MetricFamily {

View File

@ -165,6 +165,82 @@ func TestCollectAndCompareNoLabel(t *testing.T) {
}
}
func TestCollectAndCompareHistogram(t *testing.T) {
inputs := []struct {
name string
c prometheus.Collector
metadata string
expect string
labels []string
observation float64
}{
{
name: "Testing Histogram Collector",
c: prometheus.NewHistogram(prometheus.HistogramOpts{
Name: "some_histogram",
Help: "An example of a histogram",
Buckets: []float64{1, 2, 3},
}),
metadata: `
# HELP some_histogram An example of a histogram
# TYPE some_histogram histogram
`,
expect: `
some_histogram{le="1"} 0
some_histogram{le="2"} 0
some_histogram{le="3"} 1
some_histogram_bucket{le="+Inf"} 1
some_histogram_sum 2.5
some_histogram_count 1
`,
observation: 2.5,
},
{
name: "Testing HistogramVec Collector",
c: prometheus.NewHistogramVec(prometheus.HistogramOpts{
Name: "some_histogram",
Help: "An example of a histogram",
Buckets: []float64{1, 2, 3},
}, []string{"test"}),
metadata: `
# HELP some_histogram An example of a histogram
# TYPE some_histogram histogram
`,
expect: `
some_histogram_bucket{test="test",le="1"} 0
some_histogram_bucket{test="test",le="2"} 0
some_histogram_bucket{test="test",le="3"} 1
some_histogram_bucket{test="test",le="+Inf"} 1
some_histogram_sum{test="test"} 2.5
some_histogram_count{test="test"} 1
`,
observation: 2.5,
},
}
for _, input := range inputs {
switch collector := input.c.(type) {
case prometheus.Histogram:
collector.Observe(input.observation)
case *prometheus.HistogramVec:
collector.WithLabelValues("test").Observe(input.observation)
default:
t.Fatalf("unsuported collector tested")
}
t.Run(input.name, func(t *testing.T) {
if err := CollectAndCompare(input.c, strings.NewReader(input.metadata+input.expect)); err != nil {
t.Errorf("unexpected collecting result:\n%s", err)
}
})
}
}
func TestNoMetricFilter(t *testing.T) {
const metadata = `
# HELP some_total A value that represents a counter.