Skip QEMU graceful shutdown test except on Travis

Hopefully we can reuse the SkipSlow helper elsewhere.

client/driver/qemu_test.go

@@ -125,12 +125,14 @@ func TestQemuDriver_StartOpen_Wait(t *testing.T) {
 }
 
 func TestQemuDriver_GracefulShutdown(t *testing.T) {
-	logger := testLogger()
+	testutil.SkipSlow(t)
 	if !testutil.IsTravis() {
 		t.Parallel()
 	}
 	ctestutils.QemuCompatible(t)
 
+	logger := testLogger()
+
 	// Graceful shutdown may be really slow unfortunately
 	killTimeout := 3 * time.Minute
 

scripts/travis.sh

@@ -14,7 +14,7 @@ if [ "$RUN_STATIC_CHECKS" ]; then
     fi
 fi
 
-make test
+NOMAD_SLOW_TEST=1 make test
 TEST_OUTPUT=$?
 
 kill $PING_LOOP_PID

testutil/slow.go

@@ -0,0 +1,15 @@
+package testutil
+
+import (
+	"os"
+
+	testing "github.com/mitchellh/go-testing-interface"
+)
+
+// SkipSlow skips a slow test unless the NOMAD_SLOW_TEST environment variable
+// is set.
+func SkipSlow(t testing.T) {
+	if os.Getenv("NOMAD_SLOW_TEST") == "" {
+		t.Skip("Skipping slow test. Set NOMAD_SLOW_TEST=1 to run.")
+	}
+}