Introduce backspace benchmark tests.

Bug: 29142734
Change-Id: I186a2019e883881ee8001848f4ae2076ed551f5b

2 files changed, 161 insertions, 2 deletions

diff --git a/apct-tests/perftests/core/src/android/widget/EditTextBackspacePerfTest.java b/apct-tests/perftests/core/src/android/widget/EditTextBackspacePerfTest.java
new file mode 100644
index 000000000000..40b56f4a59fd
--- /dev/null
+++ b/apct-tests/perftests/core/src/android/widget/EditTextBackspacePerfTest.java
@@ -0,0 +1,128 @@
+/*
+ * 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 android.widget;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.perftests.utils.BenchmarkState;
+import android.perftests.utils.PerfStatusReporter;
+import android.perftests.utils.StubActivity;
+import android.text.Selection;
+import android.view.KeyEvent;
+import android.view.View.MeasureSpec;
+import android.view.ViewGroup;
+
+import android.support.test.InstrumentationRegistry;
+import android.support.test.filters.LargeTest;
+import android.support.test.rule.ActivityTestRule;
+import android.support.test.runner.AndroidJUnit4;
+
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Locale;
+
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized.Parameters;
+import org.junit.runners.Parameterized;
+
+@LargeTest
+@RunWith(Parameterized.class)
+public class EditTextBackspacePerfTest {
+
+    private static final String BOY = "\uD83D\uDC66";  // U+1F466
+    private static final String US_FLAG = "\uD83C\uDDFA\uD83C\uDDF8";  // U+1F1FA U+1F1F8
+    private static final String FAMILY =
+            // U+1F469 U+200D U+1F469 U+200D U+1F467 U+200D U+1F467
+            "\uD83D\uDC69\u200D\uD83D\uDC69\u200D\uD83D\uDC67\u200D\uD83D\uDC67";
+    private static final String EMOJI_MODIFIER = "\uD83C\uDFFD";  // U+1F3FD
+    private static final String KEYCAP = "\u20E3";
+    private static final String COLOR_COPYRIGHT = "\u00A9\uFE0F";
+
+    @Parameters(name = "{0}")
+    public static Collection cases() {
+        return Arrays.asList(new Object[][] {
+            { "Latin", "aaa", 1 },
+            { "Flags", US_FLAG + US_FLAG + US_FLAG, 4 },
+            { "EmojiModifier",
+                BOY + EMOJI_MODIFIER + BOY + EMOJI_MODIFIER + BOY + EMOJI_MODIFIER, 4 },
+            { "KeyCap", "1" + KEYCAP + "1" + KEYCAP + "1" + KEYCAP, 2 },
+            { "ZwjSequence", FAMILY + FAMILY + FAMILY, 11 },
+            { "VariationSelector", COLOR_COPYRIGHT + COLOR_COPYRIGHT + COLOR_COPYRIGHT, 2 },
+        });
+    }
+
+    private final String mMetricKey;
+    private final String mText;
+    private final int mCursorPos;
+
+    private static final KeyEvent BACKSPACE_KEY_EVENT =
+            new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DEL);
+    private static final KeyEvent RIGHT_ARROW_KEY_EVENT =
+            new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_RIGHT);
+
+    public EditTextBackspacePerfTest(String metricKey, String text, int cursorPos) {
+        mMetricKey = metricKey;
+        mText = text;
+        mCursorPos = cursorPos;
+    }
+
+    @Rule
+    public ActivityTestRule<StubActivity> mActivityRule = new ActivityTestRule(StubActivity.class);
+
+    @Rule
+    public PerfStatusReporter mPerfStatusReporter = new PerfStatusReporter();
+
+    private void prepareTextForBackspace(EditText editText) {
+        editText.setText(mText, TextView.BufferType.EDITABLE);
+        Selection.setSelection(editText.getText(), 0, 0);
+
+        // Do layout it here since the cursor movement requires layout information but it
+        // happens asynchronously even if the view is attached to an Activity.
+        editText.setLayoutParams(new ViewGroup.LayoutParams(
+                ViewGroup.LayoutParams.WRAP_CONTENT,
+                ViewGroup.LayoutParams.WRAP_CONTENT));
+        editText.invalidate();
+        editText.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
+                MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
+        editText.layout(0, 0, 1024, 768);
+
+        // mText contains three grapheme clusters. Move the cursor to the 2nd grapheme
+        // cluster by forwarding right arrow key event.
+        editText.onKeyDown(RIGHT_ARROW_KEY_EVENT.getKeyCode(), RIGHT_ARROW_KEY_EVENT);
+        Assert.assertEquals(mCursorPos, Selection.getSelectionStart(editText.getText()));
+    }
+
+    @Test
+    public void testBackspace() {
+        InstrumentationRegistry.getInstrumentation().runOnMainSync(() -> {
+            EditText editText = new EditText(mActivityRule.getActivity());
+
+            BenchmarkState state = mPerfStatusReporter.getBenchmarkState();
+            while (state.keepRunning()) {
+                // Prepare the test data for this iteration with pausing timer.
+                state.pauseTiming();
+                prepareTextForBackspace(editText);
+                state.resumeTiming();
+
+                editText.onKeyDown(BACKSPACE_KEY_EVENT.getKeyCode(), BACKSPACE_KEY_EVENT);
+            }
+        });
+    }
+}
diff --git a/apct-tests/perftests/utils/src/android/perftests/utils/BenchmarkState.java b/apct-tests/perftests/utils/src/android/perftests/utils/BenchmarkState.java
index 8e1674abae08..2c5a9eac481d 100644
--- a/apct-tests/perftests/utils/src/android/perftests/utils/BenchmarkState.java
+++ b/apct-tests/perftests/utils/src/android/perftests/utils/BenchmarkState.java
@@ -46,13 +46,16 @@ public class BenchmarkState {
 
     private static final int NOT_STARTED = 1;  // The benchmark has not started yet.
     private static final int RUNNING = 2;  // The benchmark is running.
-    private static final int FINISHED = 3;  // The benchmark has stopped.
+    private static final int RUNNING_PAUSED = 3;  // The benchmark is temporary paused.
+    private static final int FINISHED = 4;  // The benchmark has stopped.
     private static final int MIN_REPEAT_TIMES = 16;
 
     private int mState = NOT_STARTED;  // Current benchmark state.
 
     private long mNanoPreviousTime = 0;  // Previously captured System.nanoTime().
     private long mNanoFinishTime = 0;  // Finish if System.nanoTime() returns after than this value.
+    private long mNanoPausedTime = 0; // The System.nanoTime() when the pauseTiming() is called.
+    private long mNanoPausedDuration = 0;  // The duration of paused state in nano sec.
     private long mNanoTimeLimit = 1 * 1000 * 1000 * 1000;  // 1 sec. Default time limit.
 
     // Statistics. These values will be filled when the benchmark has finished.
@@ -89,6 +92,29 @@ public class BenchmarkState {
         mStandardDeviation = Math.sqrt(mStandardDeviation / (double) (size - 1));
     }
 
+    // Stops the benchmark timer.
+    // This method can be called only when the timer is running.
+    public void pauseTiming() {
+        if (mState == RUNNING_PAUSED) {
+            throw new IllegalStateException(
+                    "Unable to pause the benchmark. The benchmark has already paused.");
+        }
+        mNanoPausedTime = System.nanoTime();
+        mState = RUNNING_PAUSED;
+    }
+
+    // Starts the benchmark timer.
+    // This method can be called only when the timer is stopped.
+    public void resumeTiming() {
+        if (mState == RUNNING) {
+            throw new IllegalStateException(
+                    "Unable to resume the benchmark. The benchmark is already running.");
+        }
+        mNanoPausedDuration += System.nanoTime() - mNanoPausedTime;
+        mNanoPausedTime = 0;
+        mState = RUNNING;
+    }
+
     /**
      * Judges whether the benchmark needs more samples.
      *
@@ -103,7 +129,8 @@ public class BenchmarkState {
                 return true;
             case RUNNING:
                 final long currentTime = System.nanoTime();
-                mResults.add(currentTime - mNanoPreviousTime);
+                mResults.add(currentTime - mNanoPreviousTime - mNanoPausedDuration);
+                mNanoPausedDuration = 0;
 
                 // To calculate statistics, needs two or more samples.
                 if (mResults.size() > MIN_REPEAT_TIMES && currentTime > mNanoFinishTime) {
@@ -114,6 +141,10 @@ public class BenchmarkState {
 
                 mNanoPreviousTime = currentTime;
                 return true;
+            case RUNNING_PAUSED:
+                throw new IllegalStateException(
+                        "Benchmark step finished with paused state. " +
+                        "Resume the benchmark before finishing each step.");
             case FINISHED:
                 throw new IllegalStateException("The benchmark has finished.");
             default: