Repurpose libnativeloader_lazy tests as shallow tests for API coverage

in CTS.

Most APIs are exercised extensively in any managed process, but use
this to cover the fringes.

This drops the mocks that used dynamic library symbol overrides
(android_create_namespace and android_link_namespaces) from the former
libnativeloader_lazy tests, because we cannot inject them in CTS tests.
However it turns out it works just fine to call into the real code in
the linker.

As a result libnativeloader_lazy_test no longer needs to be built with
exported symbols necessary to make the symbol override mocks to work.

Also strengthen the CreateClassLoaderNamespace test slightly by
verifying that it really did create a classloader namespace.

Also move libnativeloader_test and libnativeloader_lazy_test from
device-tests to general-tests, because they shouldn't have any device
dependencies.

Test: atest libnativeloader_test \
            art_libnativeloader_cts_test \
            libnativeloader_lazy_test
Bug: 335224367
Change-Id: Idd15d5a79f4f54c68304a4b758c7a46ba9b96c86

1 files changed, 127 insertions, 0 deletions

diff --git a/libnativeloader/native_loader_api_test.cpp b/libnativeloader/native_loader_api_test.cpp
new file mode 100644
index 0000000000..78fb29f91d
--- /dev/null
+++ b/libnativeloader/native_loader_api_test.cpp
@@ -0,0 +1,127 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#if defined(ART_TARGET_ANDROID)
+
+#include "gtest/gtest.h"
+#include "native_loader_test.h"
+#include "nativehelper/scoped_utf_chars.h"
+#include "nativeloader/native_loader.h"
+
+namespace android {
+namespace nativeloader {
+
+using ::testing::Return;
+using ::testing::StrEq;
+
+// Test the exported API in libnativeloader and libnativeloader_lazy. The
+// testing we can do here outside a full VM is limited, but this is only to
+// complement other tests and ensure coverage of the APIs that aren't in the
+// common call paths.
+
+class NativeLoaderLazyTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    mock = std::make_unique<testing::NiceMock<MockPlatform>>(false);
+    env = std::make_unique<JNIEnv>();
+    env->functions = CreateJNINativeInterface();
+  }
+
+  void TearDown() override {
+    // ResetNativeLoader isn't accessible through the lazy library, so we cannot
+    // reset libnativeloader internal state. Hence be sure to not reuse the same
+    // class loader/namespace names.
+    delete env->functions;
+    mock.reset();
+  }
+
+  void CallCreateClassLoaderNamespace(const char* class_loader) {
+    ON_CALL(*mock, JniObject_getParent(StrEq(class_loader))).WillByDefault(Return(nullptr));
+
+    jstring err = CreateClassLoaderNamespace(env.get(),
+                                             17,
+                                             env.get()->NewStringUTF(class_loader),
+                                             false,
+                                             env.get()->NewStringUTF("/data/app/foo/classes.dex"),
+                                             env.get()->NewStringUTF("/data/app/foo"),
+                                             /*permitted_path=*/nullptr,
+                                             /*uses_library_list=*/nullptr);
+    EXPECT_EQ(err, nullptr) << "Error is: " << std::string(ScopedUtfChars(env.get(), err).c_str());
+  }
+
+  std::unique_ptr<JNIEnv> env;
+};
+
+TEST_F(NativeLoaderLazyTest, CreateClassLoaderNamespace) {
+  CallCreateClassLoaderNamespace("my_classloader_1");
+  EXPECT_NE(FindNamespaceByClassLoader(env.get(), env.get()->NewStringUTF("my_classloader_1")),
+            nullptr);
+}
+
+TEST_F(NativeLoaderLazyTest, OpenNativeLibrary) {
+  bool needs_native_bridge;
+  char* errmsg = nullptr;
+  EXPECT_EQ(nullptr,
+            OpenNativeLibrary(env.get(),
+                              17,
+                              "libnotfound.so",
+                              env.get()->NewStringUTF("my_classloader"),
+                              /*caller_location=*/nullptr,
+                              /*library_path=*/nullptr,
+                              &needs_native_bridge,
+                              &errmsg));
+  EXPECT_NE(nullptr, errmsg);
+  NativeLoaderFreeErrorMessage(errmsg);
+}
+
+TEST_F(NativeLoaderLazyTest, CloseNativeLibrary) {
+  char* errmsg = nullptr;
+  EXPECT_FALSE(CloseNativeLibrary(nullptr, false, &errmsg));
+  EXPECT_NE(nullptr, errmsg);
+  NativeLoaderFreeErrorMessage(errmsg);
+}
+
+TEST_F(NativeLoaderLazyTest, OpenNativeLibraryInNamespace) {
+  CallCreateClassLoaderNamespace("my_classloader_2");
+  struct NativeLoaderNamespace* ns = FindNativeLoaderNamespaceByClassLoader(
+      env.get(), env.get()->NewStringUTF("my_classloader_2"));
+  ASSERT_NE(nullptr, ns);
+
+  bool needs_native_bridge;
+  char* errmsg = nullptr;
+  EXPECT_FALSE(OpenNativeLibraryInNamespace(ns, "libnotfound.so", &needs_native_bridge, &errmsg));
+  EXPECT_NE(nullptr, errmsg);
+  NativeLoaderFreeErrorMessage(errmsg);
+}
+
+TEST_F(NativeLoaderLazyTest, FindNamespaceByClassLoader) {
+  EXPECT_EQ(nullptr, FindNamespaceByClassLoader(env.get(), env.get()->NewStringUTF("namespace")));
+}
+
+TEST_F(NativeLoaderLazyTest, FindNativeLoaderNamespaceByClassLoader) {
+  EXPECT_EQ(
+      nullptr,
+      FindNativeLoaderNamespaceByClassLoader(env.get(), env.get()->NewStringUTF("namespace")));
+}
+
+TEST_F(NativeLoaderLazyTest, NativeLoaderFreeErrorMessage) {
+  NativeLoaderFreeErrorMessage(nullptr);
+}
+
+}  // namespace nativeloader
+}  // namespace android
+
+#endif  // defined(ART_TARGET_ANDROID)