tests: move testsuite and configs into subsys/

Move test related code and the testsuite away from tests/ and make it a
proper subsystem.
The way tests were integrate in the tree was not obvious and actual
tests were intermixed with the testsuite code.

This will allow us to have trees with the testcode and without the
samples by just remove the folders tests/ and samples, needed for
isolating actual code from test/sample code.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

subsys/testsuite/ztest/include/ztest.h

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ *
+ * @brief Zephyr testing suite
+ */
+
+/**
+ * @brief Zephyr Tests
+ * @defgroup all_tests Zephyr Tests
+ * @{
+ * @}
+ */
+
+#ifndef __ZTEST_H__
+#define __ZTEST_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @defgroup ztest Zephyr testing suite
+ */
+
+#if !defined(CONFIG_ZTEST) && !defined(ZTEST_UNITTEST)
+#error "You need to add CONFIG_ZTEST to your config file."
+#endif
+
+#ifndef KERNEL
+#define CONFIG_STDOUT_CONSOLE 1
+#define CONFIG_ZTEST_ASSERT_VERBOSE 1
+#define CONFIG_ZTEST_MOCKING
+#define CONFIG_NUM_COOP_PRIORITIES 16
+#define CONFIG_COOP_ENABLED 1
+#define CONFIG_PREEMPT_ENABLED 1
+#define CONFIG_SYS_CLOCK_TICKS_PER_SEC 100
+#define CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC 10000000
+/* FIXME: Properly integrate with Zephyr's arch specific code */
+#define CONFIG_X86 1
+#define PRINT printf
+#endif /* !KERNEL */
+
+#include <zephyr.h>
+
+#if defined(CONFIG_STDOUT_CONSOLE)
+#include <stdio.h>
+#define  PRINT printf
+#else /* !CONFIG_STDOUT_CONSOLE */
+#include <misc/printk.h>
+#define PRINT printk
+#endif /* CONFIG_STDOUT_CONSOLE */
+
+#include <ztest_assert.h>
+#include <ztest_mock.h>
+#include <ztest_test.h>
+#include <tc_util.h>
+
+void test_main(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ZTEST_H__ */