Adding some UI tests

> Launcher app from all-apps
> Drag icon to all-apps and launch it
> Add widget from widget tray

Change-Id: I6bd6128a7b560a23a887d1fb40bfcda25b9b02e7

tests/src/com/android/launcher3/ui/AddWidgetTest.java

@@ -0,0 +1,64 @@
+package com.android.launcher3.ui;
+
+import android.support.test.uiautomator.By;
+import android.support.test.uiautomator.UiObject2;
+import android.test.suitebuilder.annotation.LargeTest;
+import android.view.View;
+
+import com.android.launcher3.CellLayout;
+import com.android.launcher3.ItemInfo;
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherAppWidgetInfo;
+import com.android.launcher3.LauncherAppWidgetProviderInfo;
+import com.android.launcher3.Workspace.ItemOperator;
+import com.android.launcher3.util.Condition;
+import com.android.launcher3.util.Wait;
+import com.android.launcher3.widget.WidgetCell;
+
+/**
+ * Test to add widget from widget tray
+ */
+@LargeTest
+public class AddWidgetTest extends LauncherInstrumentationTestCase {
+
+    private LauncherAppWidgetProviderInfo widgetInfo;
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+
+        widgetInfo = findWidgetProvider(false /* hasConfigureScreen */);
+    }
+
+    public void testDragIcon_portrait() throws Throwable {
+        lockRotation(true);
+        performTest();
+    }
+
+    public void testDragIcon_landscape() throws Throwable {
+        lockRotation(false);
+        performTest();
+    }
+
+    private void performTest() throws Throwable {
+        clearHomescreen();
+        Launcher launcher = startLauncher();
+
+        // Open all apps and wait for load complete.
+        final UiObject2 widgetContainer = openWidgetsTray();
+        assertTrue(Wait.atMost(Condition.minChildCount(widgetContainer, 2), DEFAULT_UI_TIMEOUT));
+
+        // Drag widget to homescreen
+        UiObject2 widget = scrollAndFind(widgetContainer, By.clazz(WidgetCell.class)
+                .hasDescendant(By.text(widgetInfo.getLabel(mTargetContext.getPackageManager()))));
+        dragToWorkspace(widget);
+
+        assertNotNull(launcher.getWorkspace().getFirstMatch(new ItemOperator() {
+            @Override
+            public boolean evaluate(ItemInfo info, View view) {
+                return info instanceof LauncherAppWidgetInfo &&
+                        ((LauncherAppWidgetInfo) info).providerName.equals(widgetInfo.provider);
+            }
+        }));
+    }
+}