ztest: add userspace tests to base tests

Add a test that verifies that ZTEST_USER is actually being run in
user context.

Signed-off-by: Yuval Peress <peress@google.com>

tests/ztest/base/CMakeLists.txt

@@ -11,4 +11,6 @@ else()
   project(base)
 
   target_sources(app PRIVATE src/main.c)
+
+  target_sources_ifdef(CONFIG_USERSPACE app PRIVATE src/main_userspace.c)
 endif()

tests/ztest/base/src/main_userspace.c

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2022 Google Inc
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <kernel.h>
+#include <ztest.h>
+
+ZTEST_USER(framework_tests, test_userspace_is_user)
+{
+	zassert_true(k_is_user_context(), NULL);
+}

tests/ztest/base/testcase.yaml

@@ -7,6 +7,14 @@ tests:
     tags: test_framework
     integration_platforms:
       - native_posix
+  testing.ztest.base.verbose_0_userspace:
+    filter: CONFIG_ARCH_HAS_USERSPACE
+    extra_args: CONF_FILE=prj_verbose_0.conf
+    tags: test_framework userspace
+    extra_configs:
+      - CONFIG_TEST_USERSPACE=y
+    integration_platforms:
+      - native_posix
   testing.ztest.base.verbose_1:
     extra_args: CONF_FILE=prj_verbose_1.conf
     tags: test_framework