separate mutex for internal and external locking

pkg/console/console_test.go

@@ -35,3 +35,18 @@ func (s *MySuite) TestSetTheme(c *C) {
 	_, ok := Theme["unknown"]
 	c.Assert(ok, Equals, true)
 }
+
+func (s *MySuite) TestLock(c *C) {
+	Lock()
+	Print("") // Test for deadlocks.
+	Unlock()
+}
+
+func (s *MySuite) TestTesting(c *C) {
+	// Enable testing
+	IsTesting = true
+	Fatalln("THIS IS A TEST MESSAGE. PLEASE INGORE.")
+	c.Assert(IsExited, Equals, true)
+	// reset back
+	IsExited = false
+}