Add warning in log when no tests are run within a suite

suite/suite.go

@@ -179,16 +179,20 @@ func Run(t *testing.T, suite TestingSuite) {
 }
 
 func runTests(t testing.TB, tests []testing.InternalTest) {
-	r, ok := t.(runner)
+	if len(tests) == 0 {
-	if !ok { // backwards compatibility with Go 1.6 and below
+		t.Log("warning: no tests to run")
-		if !testing.RunTests(allTestsFilter, tests) {
+	} else {
-			t.Fail()
+		r, ok := t.(runner)
+		if !ok { // backwards compatibility with Go 1.6 and below
+			if !testing.RunTests(allTestsFilter, tests) {
+				t.Fail()
+			}
+			return
 		}
-		return
-	}
 
-	for _, test := range tests {
+		for _, test := range tests {
-		r.Run(test.Name, test.F)
+			r.Run(test.Name, test.F)
+		}
 	}
 }