JACOBIN-418 Added test instantiation of java/lang/Object. If this wor…

…ks on GitHub, will expand with other classes.

src/jvm/instantiate_test.go

@@ -184,10 +184,48 @@ func TestLoadClassWithEmptyStringAsName(t *testing.T) {
 	os.Stderr = normalStderr
 
 	if err == nil {
-		t.Errorf("Expected error message for class with no nsmr, but got none")
+		t.Errorf("Expected error message for class with no name string, but got none")
 	}
 
 	if !strings.Contains(err.Error(), "Failed to load class") {
 		t.Errorf("Got the wrong error message: %s", err.Error())
 	}
 }
+
+// This should always work. java/lang/Object contains no instance or static fields,
+// so this is about as simple a class instantiation as possible
+func TestLoadClassJavaLangObject(t *testing.T) {
+	globals.InitGlobals("test")
+	log.Init()
+	_ = log.SetLogLevel(log.WARNING)
+
+	// redirect stderr, to avoid all the error msgs for a non-existent class
+	normalStderr := os.Stderr
+	_, werr, err := os.Pipe()
+	os.Stderr = werr
+
+	classloader.InitMethodArea()
+
+	// initialize the MTable and other class entries
+	classloader.MTable = make(map[string]classloader.MTentry)
+
+	// Init classloader and load base classes
+	err = classloader.Init() // must precede classloader.LoadBaseClasses
+	if err != nil {
+		t.Errorf("Got unexpected error from classloader.Init: %s", err.Error())
+	}
+	classloader.LoadBaseClasses()
+
+	err = loadThisClass("java/lang/Object")
+
+	// this should always work. java/lang/Object contains no instance or static fields,
+	// so this is about as simple a class instantiation as possible
+
+	// restore stderr
+	_ = werr.Close()
+	os.Stderr = normalStderr
+
+	if err != nil {
+		t.Errorf("Got unexpected error from loadThisClass: %s", err.Error())
+	}
+}