1 files changed, 23 insertions, 1 deletions
diff --git a/vendor/github.com/prometheus/client_golang/prometheus/histogram_test.go b/vendor/github.com/prometheus/client_golang/prometheus/histogram_test.go
index d1242e08d..5a20f4b6b 100644
--- a/vendor/github.com/prometheus/client_golang/prometheus/histogram_test.go
+++ b/vendor/github.com/prometheus/client_golang/prometheus/histogram_test.go
@@ -119,6 +119,28 @@ func BenchmarkHistogramWrite8(b *testing.B) {
 	benchmarkHistogramWrite(8, b)
 }
 
+func TestHistogramNonMonotonicBuckets(t *testing.T) {
+	testCases := map[string][]float64{
+		"not strictly monotonic":  {1, 2, 2, 3},
+		"not monotonic at all":    {1, 2, 4, 3, 5},
+		"have +Inf in the middle": {1, 2, math.Inf(+1), 3},
+	}
+	for name, buckets := range testCases {
+		func() {
+			defer func() {
+				if r := recover(); r == nil {
+					t.Errorf("Buckets %v are %s but NewHistogram did not panic.", buckets, name)
+				}
+			}()
+			_ = NewHistogram(HistogramOpts{
+				Name:    "test_histogram",
+				Help:    "helpless",
+				Buckets: buckets,
+			})
+		}()
+	}
+}
+
 // Intentionally adding +Inf here to test if that case is handled correctly.
 // Also, getCumulativeCounts depends on it.
 var testBuckets = []float64{-2, -1, -0.5, 0, 0.5, 1, 2, math.Inf(+1)}
@@ -264,7 +286,7 @@ func TestHistogramVecConcurrency(t *testing.T) {
 		for i := 0; i < vecLength; i++ {
 			m := &dto.Metric{}
 			s := his.WithLabelValues(string('A' + i))
-			s.Write(m)
+			s.(Histogram).Write(m)
 
 			if got, want := len(m.Histogram.Bucket), len(testBuckets)-1; got != want {
 				t.Errorf("got %d buckets in protobuf, want %d", got, want)