From 2ac12028ca2eaedcb728af98f6104cd74e6736e2 Mon Sep 17 00:00:00 2001
From: Maciej Bocianski <maciej.bocianski@gmail.com>
Date: Mon, 4 Dec 2017 11:04:04 +0100
Subject: [PATCH] Add SingletonPtr test

---
 TESTS/mbed_platform/SingletonPtr/main.cpp | 101 ++++++++++++++++++++++
 1 file changed, 101 insertions(+)
 create mode 100644 TESTS/mbed_platform/SingletonPtr/main.cpp

diff --git a/TESTS/mbed_platform/SingletonPtr/main.cpp b/TESTS/mbed_platform/SingletonPtr/main.cpp
new file mode 100644
index 0000000000..80813ebc9a
--- /dev/null
+++ b/TESTS/mbed_platform/SingletonPtr/main.cpp
@@ -0,0 +1,101 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2017 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "mbed.h"
+#include "greentea-client/test_env.h"
+#include "utest/utest.h"
+#include "unity/unity.h"
+
+using utest::v1::Case;
+
+
+class InstanceTest {
+public:
+    InstanceTest()
+    {
+        _instance_counter++;
+    }
+
+    static int get_instance_counter()
+    {
+        return _instance_counter;
+    }
+
+private:
+    static int _instance_counter;
+};
+
+int InstanceTest::_instance_counter = 0;
+
+
+SingletonPtr<InstanceTest> singleton;
+
+
+/** Test SingletonPtr lazy initialization
+ *
+ *  Given a global singleton of type SingletonPtr<InstanceTest>
+ *  When before first singleton use
+ *  Then underneath object is yet not created
+ */
+void test_lazy_initialization()
+{
+    TEST_ASSERT_MESSAGE(InstanceTest::get_instance_counter() == 0, "Initialized before first use!!!");
+}
+
+/** Test SingletonPtr single instance
+ *
+ *  Given a singleton of type SingletonPtr<InstanceTest>
+ *
+ *  When after first singleton use
+ *  Then underneath object was created exactly once
+ *
+ *  When after second singleton use
+ *  Then underneath object was created exactly once
+ *       and both (ref1 and ref2) are references to same instance
+ *
+ */
+void test_single_instance()
+{
+    InstanceTest *ref1 = singleton.get();
+    TEST_ASSERT_NOT_NULL(ref1);
+
+    TEST_ASSERT_EQUAL_INT(1, InstanceTest::get_instance_counter());
+
+    InstanceTest *ref2 = singleton.get();
+    TEST_ASSERT_NOT_NULL(ref2);
+
+    TEST_ASSERT_EQUAL_INT(1, InstanceTest::get_instance_counter());
+
+    // same instance
+    TEST_ASSERT_EQUAL_PTR(ref1, ref2);
+}
+
+utest::v1::status_t test_setup(const size_t number_of_cases)
+{
+    GREENTEA_SETUP(10, "default_auto");
+    return utest::v1::verbose_test_setup_handler(number_of_cases);
+}
+
+Case cases[] = {
+    Case("Test lazy initialization", test_lazy_initialization),
+    Case("Test single instance", test_single_instance),
+};
+
+utest::v1::Specification specification(test_setup, cases);
+
+int main()
+{
+    return !utest::v1::Harness::run(specification);
+}