Mark slow test as such and exclude them from travis.

Author: beorn7

Makefile

@@ -82,7 +82,7 @@ example_simple: source_path dependencies examples/simple/main.go
 	$(GO) build -o example_simple examples/simple/main.go
 
 test: build
-	$(GO) test ./...
+	$(GO) test -short ./...
 
 benchmark: build
 	$(GO) test -benchmem -test.bench="$(BENCHMARK_FILTER)" ./...

prometheus/summary_test.go

@@ -120,6 +120,10 @@ func BenchmarkSummaryWrite8(b *testing.B) {
 }
 
 func TestSummaryConcurrency(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping test in short mode.")
+	}
+
 	rand.Seed(42)
 
 	it := func(n uint32) bool {
@@ -195,6 +199,10 @@ func TestSummaryConcurrency(t *testing.T) {
 }
 
 func TestSummaryVecConcurrency(t *testing.T) {
+	if testing.Short() {
+		t.Skip("Skipping test in short mode.")
+	}
+
 	rand.Seed(42)
 
 	objectives := make([]float64, 0, len(DefObjectives))