Add GitHub Action to build unit tests

This commit adds a simple unit test based on the Zephyr Test
Framework (Ztest).

Signed-off-by: Yasushi SHOJI <[email protected]>

Author: yashi

.github/workflows/test.yml

@@ -0,0 +1,62 @@
+name: Zephyr Build and Test
+
+on: [push, pull_request]
+
+jobs:
+  build-zephyr:
+    runs-on: ubuntu-22.04
+    container:
+      image: ghcr.io/zephyrproject-rtos/ci:v0.26.4
+      options: '--entrypoint /bin/bash'
+    strategy:
+      fail-fast: false
+      matrix:
+        board:
+          - qemu_cortex_m3
+    env:
+      ZEPHYR_SDK_INSTALL_DIR: /opt/toolchains/zephyr-sdk-0.16.1
+      ZEPHYR_TOOLCHAIN_VARIANT: zephyr
+    steps:
+      - name: Apply container owner mismatch workaround
+        run: |
+          # FIXME: The owner UID of the GITHUB_WORKSPACE directory may not
+          #        match the container user UID because of the way GitHub
+          #        Actions runner is implemented. Remove this workaround when
+          #        GitHub comes up with a fundamental fix for this problem.
+          git config --global --add safe.directory ${GITHUB_WORKSPACE}
+
+      - name: Update PATH for west
+        run: |
+          echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+      - name: Configure Git
+        run: |
+          git config --global user.email [email protected]
+          git config --global user.name "Github Actions"
+
+      - name: Setup Git (pull request)
+        if: ${{ github.base_ref }}
+        env:
+          BASE_REF: ${{ github.base_ref }}
+        run: |
+          git rebase origin/${BASE_REF}
+          git checkout -b this_pr
+
+      - name: Setup build system packages on Linux
+        run: |
+          sudo apt-get -y update
+          sudo apt-get -y install nodejs
+
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: West Setup
+        run: |
+          west init -l . || true
+          west config --global update.narrow true
+          west config --global build.board_warn false
+          west update 2>&1 1> west.update.log || west update 2>&1 1> west.update.log
+
+      - name: Build the PR
+        run: |
+          west build -b ${{ matrix.board }} .

prj.conf

@@ -0,0 +1 @@
+CONFIG_ZTEST=y

src/main.c

@@ -4,10 +4,22 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#include <zephyr.h>
-#include <sys/printk.h>
+#include <ztest.h>
 
-void main(void)
+static void test_assert(void)
 {
-	printk("Hello World! %s\n", CONFIG_BOARD);
+	zassert_true(1, "1 was false");
+	zassert_false(0, "0 was true");
+	zassert_is_null(NULL, "NULL was not NULL");
+	zassert_not_null("foo", "\"foo\" was NULL");
+	zassert_equal(1, 1, "1 was not equal to 1");
+	zassert_equal_ptr(NULL, NULL, "NULL was not equal to NULL");
+}
+
+void test_main(void)
+{
+	ztest_test_suite(tests,
+			 ztest_unit_test(test_assert));
+
+	ztest_run_test_suite(tests);
 }