Record whether a file picker specialized for media content can be used

ui/android/junit/src/org/chromium/ui/base/SelectFileDialogTest.java

Index: ui/android/junit/src/org/chromium/ui/base/SelectFileDialogTest.java
diff --git a/ui/android/junit/src/org/chromium/ui/base/SelectFileDialogTest.java b/ui/android/junit/src/org/chromium/ui/base/SelectFileDialogTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..9c195f11a9856e7ac69e0ff97f461caa60034e68
--- /dev/null
+++ b/ui/android/junit/src/org/chromium/ui/base/SelectFileDialogTest.java
@@ -0,0 +1,62 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.ui.base;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+
+import org.chromium.testing.local.LocalRobolectricTestRunner;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+/**
+ * Tests logic in the SelectFileDialog class.
+ */
+@RunWith(LocalRobolectricTestRunner.class)
+@Config(manifest = Config.NONE)
+public class SelectFileDialogTest {
+    /**
+     * Returns the determined scope for the accepted |fileTypes|.
+     */
+    private int scopeForFileTypes(String... fileTypes) {
+        SelectFileDialog instance = SelectFileDialog.create((long) 0 /* nativeSelectFileDialog */);
+        instance.setFileTypesForTests(new ArrayList<String>(Arrays.asList(fileTypes)));
+
+        return instance.determineSelectFileDialogScope();
+    }
+
+    @Test
+    public void testDetermineSelectFileDialogScope() {
+        assertEquals(SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_GENERIC, scopeForFileTypes());
+        assertEquals(SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_GENERIC, scopeForFileTypes("*/*"));
+        assertEquals(
+                SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_GENERIC, scopeForFileTypes("text/plain"));
+
+        assertEquals(
+                SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_IMAGES, scopeForFileTypes("image/*"));
+        assertEquals(
+                SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_IMAGES, scopeForFileTypes("image/png"));
+        assertEquals(SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_GENERIC,
+                scopeForFileTypes("image/*", "test/plain"));
+
+        assertEquals(
+                SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_VIDEOS, scopeForFileTypes("video/*"));
+        assertEquals(
+                SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_VIDEOS, scopeForFileTypes("video/ogg"));
+        assertEquals(SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_GENERIC,
+                scopeForFileTypes("video/*", "test/plain"));
+
+        assertEquals(SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_IMAGES_AND_VIDEOS,
+                scopeForFileTypes("video/*", "image/*"));
+        assertEquals(SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_IMAGES_AND_VIDEOS,
+                scopeForFileTypes("image/jpeg", "video/ogg"));
+        assertEquals(SelectFileDialog.SELECT_FILE_DIALOG_SCOPE_GENERIC,
+                scopeForFileTypes("video/*", "image/*", "text/plain"));
+    }
+}