Re-land example for disabling changes at test time

Added Frameworks specific PlatformCompatChangeRule, which
fixes libcore tests dependency on Framework.

Test: atest PlatformCompatGating
Bug: 140367850
Change-Id: I4a97ff43d41110251473868d186462039a889e28

2 files changed, 181 insertions, 0 deletions

diff --git a/tests/PlatformCompatGating/src/com/android/compat/testing/DummyApi.java b/tests/PlatformCompatGating/src/com/android/compat/testing/DummyApi.java
new file mode 100644
index 000000000000..731be8e3d9f0
--- /dev/null
+++ b/tests/PlatformCompatGating/src/com/android/compat/testing/DummyApi.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+package com.android.compat.testing;
+
+import android.compat.Compatibility;
+import android.content.Context;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+
+import com.android.internal.compat.IPlatformCompat;
+
+/**
+ * This is a dummy API to test gating
+ *
+ * @hide
+ */
+public class DummyApi {
+
+    public static final long CHANGE_ID = 666013;
+    public static final long CHANGE_ID_1 = 666014;
+    public static final long CHANGE_ID_2 = 666015;
+    public static final long CHANGE_SYSTEM_SERVER = 666016;
+
+    /**
+     * Dummy method
+     * @return "A" if change is enabled, "B" otherwise.
+     */
+    public static String dummyFunc() {
+        if (Compatibility.isChangeEnabled(CHANGE_ID)) {
+            return "A";
+        }
+        return "B";
+    }
+
+    /**
+     * Dummy combined method
+     * @return "0" if {@link CHANGE_ID_1} is disabled and {@link CHANGE_ID_2} is disabled,
+               "1" if {@link CHANGE_ID_1} is disabled and {@link CHANGE_ID_2} is enabled,
+               "2" if {@link CHANGE_ID_1} is enabled and {@link CHANGE_ID_2} is disabled,
+               "3" if {@link CHANGE_ID_1} is enabled and {@link CHANGE_ID_2} is enabled.
+     */
+    public static String dummyCombinedFunc() {
+        if (!Compatibility.isChangeEnabled(CHANGE_ID_1)
+                && !Compatibility.isChangeEnabled(CHANGE_ID_2)) {
+            return "0";
+        } else if (!Compatibility.isChangeEnabled(CHANGE_ID_1)
+                && Compatibility.isChangeEnabled(CHANGE_ID_2)) {
+            return "1";
+        } else if (Compatibility.isChangeEnabled(CHANGE_ID_1)
+                && !Compatibility.isChangeEnabled(CHANGE_ID_2)) {
+            return "2";
+        }
+        return "3";
+    }
+
+    /**
+     * Dummy api using system server API.
+     */
+    public static boolean dummySystemServer(Context context) {
+        IPlatformCompat platformCompat = IPlatformCompat.Stub
+                .asInterface(ServiceManager.getService(Context.PLATFORM_COMPAT_SERVICE));
+        if (platformCompat == null) {
+            throw new RuntimeException("Could not obtain IPlatformCompat instance!");
+        }
+        String packageName = context.getPackageName();
+        try {
+            return platformCompat.isChangeEnabledByPackageName(CHANGE_SYSTEM_SERVER, packageName,
+                                                            context.getUserId());
+        } catch (RemoteException e) {
+            throw new RuntimeException("Could not get change value!", e);
+        }
+    }
+}
diff --git a/tests/PlatformCompatGating/src/com/android/tests/gating/PlatformCompatGatingTest.java b/tests/PlatformCompatGating/src/com/android/tests/gating/PlatformCompatGatingTest.java
new file mode 100644
index 000000000000..dc317f1941c7
--- /dev/null
+++ b/tests/PlatformCompatGating/src/com/android/tests/gating/PlatformCompatGatingTest.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+package com.android.tests.gating;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.compat.testing.PlatformCompatChangeRule;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import com.android.compat.testing.DummyApi;
+
+import libcore.junit.util.compat.CoreCompatChangeRule.DisableCompatChanges;
+import libcore.junit.util.compat.CoreCompatChangeRule.EnableCompatChanges;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TestRule;
+import org.junit.runner.RunWith;
+
+/**
+ * Tests for platform compatibility change gating.
+ */
+@RunWith(AndroidJUnit4.class)
+public class PlatformCompatGatingTest {
+
+    @Rule
+    public TestRule compatChangeRule = new PlatformCompatChangeRule();
+
+    @Test
+    @EnableCompatChanges({DummyApi.CHANGE_ID})
+    public void testDummyGatingPositive() {
+        assertThat(DummyApi.dummyFunc()).isEqualTo("A");
+    }
+
+    @Test
+    @DisableCompatChanges({DummyApi.CHANGE_ID})
+    public void testDummyGatingNegative() {
+        assertThat(DummyApi.dummyFunc()).isEqualTo("B");
+    }
+
+    @Test
+    @DisableCompatChanges({DummyApi.CHANGE_ID_1, DummyApi.CHANGE_ID_2})
+    public void testDummyGatingCombined0() {
+        assertThat(DummyApi.dummyCombinedFunc()).isEqualTo("0");
+    }
+
+    @Test
+    @DisableCompatChanges({DummyApi.CHANGE_ID_1})
+    @EnableCompatChanges({DummyApi.CHANGE_ID_2})
+    public void testDummyGatingCombined1() {
+        assertThat(DummyApi.dummyCombinedFunc()).isEqualTo("1");
+    }
+
+    @Test
+    @EnableCompatChanges({DummyApi.CHANGE_ID_1})
+    @DisableCompatChanges({DummyApi.CHANGE_ID_2})
+    public void testDummyGatingCombined2() {
+        assertThat(DummyApi.dummyCombinedFunc()).isEqualTo("2");
+    }
+
+    @Test
+    @EnableCompatChanges({DummyApi.CHANGE_ID_1, DummyApi.CHANGE_ID_2})
+    public void testDummyGatingCombined3() {
+        assertThat(DummyApi.dummyCombinedFunc()).isEqualTo("3");
+    }
+
+    @Test
+    @EnableCompatChanges({DummyApi.CHANGE_SYSTEM_SERVER})
+    public void testDummyGatingPositiveSystemServer() {
+        assertThat(
+                DummyApi.dummySystemServer(InstrumentationRegistry.getTargetContext())).isTrue();
+    }
+
+    @Test
+    @DisableCompatChanges({DummyApi.CHANGE_SYSTEM_SERVER})
+    public void testDummyGatingNegativeSystemServer() {
+        assertThat(
+                DummyApi.dummySystemServer(InstrumentationRegistry.getTargetContext())).isFalse();
+    }
+}