Create Zephyr workspace app

tests/lib/custom/CMakeLists.txt

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+# Copyright (c) 2021, Legrand North America, LLC.
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(app_lib_custom_test)
+
+target_sources(app PRIVATE src/main.c)

tests/lib/custom/prj.conf

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+CONFIG_ZTEST=y
+CONFIG_CUSTOM=y

tests/lib/custom/src/main.c

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+/*
+ * Copyright (c) 2021 Legrand North America, LLC.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * @file test custom_lib library
+ *
+ * This suite verifies that the methods provided with the custom_lib
+ * library works correctly.
+ */
+
+#include <limits.h>
+
+#include <zephyr/ztest.h>
+
+#include <app/lib/custom.h>
+
+ZTEST(custom_lib, test_get_value)
+{
+	/* Verify standard behavior */
+	zassert_equal(custom_get_value(INT_MIN), INT_MIN,
+		"get_value failed input of INT_MIN");
+	zassert_equal(custom_get_value(INT_MIN + 1), INT_MIN + 1,
+		"get_value failed input of INT_MIN + 1");
+	zassert_equal(custom_get_value(-1), -1,
+		"get_value failed input of -1");
+	zassert_equal(custom_get_value(1), 1,
+		"get_value failed input of 1");
+	zassert_equal(custom_get_value(INT_MAX - 1), INT_MAX - 1,
+		"get_value failed input of INT_MAX - 1");
+	zassert_equal(custom_get_value(INT_MAX), INT_MAX,
+		"get_value failed input of INT_MAX");
+
+	/* Verify override behavior */
+	zassert_equal(custom_get_value(0),
+		CONFIG_CUSTOM_GET_VALUE_DEFAULT,
+		"get_value failed input of 0");
+}
+
+ZTEST_SUITE(custom_lib, NULL, NULL, NULL, NULL, NULL);

tests/lib/custom/testcase.yaml

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+common:
+  tags: extensibility
+  integration_platforms:
+    - custom_plank
+    - qemu_cortex_m0
+tests:
+  lib.custom: {}
+  lib.custom.non_default:
+    extra_args: CONFIG_CUSTOM_GET_VALUE_DEFAULT=6