tests: kernel: posix: clock: Add posix clock test.

Add posix clock API test.

Signed-off-by: Youvedeep Singh <[email protected]>

Author: youvedeep-singh

tests/kernel/posix/clock/CMakeLists.txt

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+include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)
+project(NONE)
+
+target_include_directories(app PRIVATE $ENV{ZEPHYR_BASE}/include/posix)
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE ${app_sources})

tests/kernel/posix/clock/prj.conf

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+CONFIG_TEST=y
+CONFIG_PTHREAD_IPC=y

tests/kernel/posix/clock/src/posix_clock.c

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+/*
+ * Copyright (c) 2018 Intel Corporation
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <tc_util.h>
+#include <pthread.h>
+
+#define SLEEP_SECONDS 1
+
+void main(void)
+{
+	u32_t status;
+	s64_t nsecs_elapsed, secs_elapsed;
+	struct timespec ts, te;
+
+	TC_START("POSIX clock APIs\n");
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	/* 2 Sec Delay */
+	sleep(SLEEP_SECONDS);
+	usleep(SLEEP_SECONDS * USEC_PER_SEC);
+	clock_gettime(CLOCK_MONOTONIC, &te);
+
+	if (te.tv_nsec >= ts.tv_nsec) {
+		secs_elapsed = te.tv_sec - ts.tv_sec;
+		nsecs_elapsed = te.tv_nsec - ts.tv_nsec;
+	} else {
+		nsecs_elapsed = NSEC_PER_SEC + te.tv_nsec - ts.tv_nsec;
+		secs_elapsed = (te.tv_sec - ts.tv_sec - 1);
+	}
+
+	status = secs_elapsed == (2 * SLEEP_SECONDS)  ? TC_PASS : TC_FAIL;
+
+	TC_PRINT("POSIX clock APIs test done\n");
+	TC_END_REPORT(status);
+}

tests/kernel/posix/clock/testcase.yaml

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+tests:
+  test:
+    tags: core