Move out test utilities to a Testables library

Test: runtest --path frameworks/base/tests/testablets/tests
        && runtest systemui

Change-Id: Ideef4aef5f26136b1741c556b9be5884f38842a0
diff --git a/tests/testables/src/android/testing/AndroidTestingRunner.java b/tests/testables/src/android/testing/AndroidTestingRunner.java
new file mode 100644
index 0000000..816ed03
--- /dev/null
+++ b/tests/testables/src/android/testing/AndroidTestingRunner.java
@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2017 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 android.testing;
+
+import android.support.test.internal.runner.junit4.statement.RunAfters;
+import android.support.test.internal.runner.junit4.statement.RunBefores;
+import android.support.test.internal.runner.junit4.statement.UiThreadStatement;
+
+import android.testing.TestableLooper.LooperStatement;
+import android.testing.TestableLooper.RunWithLooper;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.internal.runners.statements.FailOnTimeout;
+import org.junit.runners.BlockJUnit4ClassRunner;
+import org.junit.runners.model.FrameworkMethod;
+import org.junit.runners.model.InitializationError;
+import org.junit.runners.model.Statement;
+
+import java.util.List;
+
+/**
+ * A runner with support for extra annotations provided by the Testables library.
+ */
+public class AndroidTestingRunner extends BlockJUnit4ClassRunner {
+
+    private final long mTimeout;
+    private final Class<?> mKlass;
+
+    public AndroidTestingRunner(Class<?> klass) throws InitializationError {
+        super(klass);
+        mKlass = klass;
+        // Can't seem to get reference to timeout parameter from here, so set default to 10 mins.
+        mTimeout = 10 * 60 * 1000;
+    }
+
+    @Override
+    protected Statement methodInvoker(FrameworkMethod method, Object test) {
+        return shouldRunOnUiThread(method) ? new UiThreadStatement(
+                methodInvokerInt(method, test), true) : methodInvokerInt(method, test);
+    }
+
+    protected Statement methodInvokerInt(FrameworkMethod method, Object test) {
+        RunWithLooper annotation = method.getAnnotation(RunWithLooper.class);
+        if (annotation == null) annotation = mKlass.getAnnotation(RunWithLooper.class);
+        if (annotation != null) {
+            return new LooperStatement(super.methodInvoker(method, test),
+                    annotation.setAsMainLooper(), test);
+        }
+        return super.methodInvoker(method, test);
+    }
+
+    protected Statement withBefores(FrameworkMethod method, Object target, Statement statement) {
+        List befores = this.getTestClass().getAnnotatedMethods(Before.class);
+        return befores.isEmpty() ? statement : new RunBefores(method, statement,
+                befores, target);
+    }
+
+    protected Statement withAfters(FrameworkMethod method, Object target, Statement statement) {
+        List afters = this.getTestClass().getAnnotatedMethods(After.class);
+        return afters.isEmpty() ? statement : new RunAfters(method, statement, afters,
+                target);
+    }
+
+    protected Statement withPotentialTimeout(FrameworkMethod method, Object test, Statement next) {
+        long timeout = this.getTimeout(method.getAnnotation(Test.class));
+        if (timeout <= 0L && mTimeout > 0L) {
+            timeout = mTimeout;
+        }
+
+        return timeout <= 0L ? next : new FailOnTimeout(next, timeout);
+    }
+
+    private long getTimeout(Test annotation) {
+        return annotation == null ? 0L : annotation.timeout();
+    }
+
+    public boolean shouldRunOnUiThread(FrameworkMethod method) {
+        if (mKlass.getAnnotation(UiThreadTest.class) != null) {
+            return true;
+        } else {
+            return UiThreadStatement.shouldRunOnUiThread(method);
+        }
+    }
+}