[Wi-Fi] Add LinkifyUtilTest file to enlarge the test coverage in WiFi Settings.

Add LinkifyUtilTest file to enlarge the test coverage in WiFi Settings.

Bug:147325788
Test: Add test file LinkifyUtilsTest to test LinkifyUtils function.
Change-Id: I6654432e7ce49dba7ffb10fa70c3ba968c1fa9f3

tests/robotests/src/com/android/settings/LinkifyUtilsTest.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2020 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.settings;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.text.Spannable;
+import android.text.style.ClickableSpan;
+import android.widget.TextView;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.RuntimeEnvironment;
+
+@RunWith(RobolectricTestRunner.class)
+public class LinkifyUtilsTest {
+    private static final String TEST_STRING = "to LINK_BEGINscanning settingsLINK_END.";
+    private static final String WRONG_STRING = "to scanning settingsLINK_END.";
+    private final LinkifyUtils.OnClickListener mClickListener = () -> { /* Do nothing */ };
+
+    private StringBuilder mSpanStringBuilder;
+    private StringBuilder mWrongSpanStringBuilder;
+    TextView mTextView;
+
+    @Before
+    public void setUp() throws Exception {
+        mSpanStringBuilder = new StringBuilder(TEST_STRING);
+        mWrongSpanStringBuilder = new StringBuilder(WRONG_STRING);
+        mTextView = new TextView(RuntimeEnvironment.application);
+    }
+
+    @Test
+    public void linkify_whenSpanStringCorrect_shouldReturnTrue() {
+        final boolean linkifyResult = LinkifyUtils.linkify(mTextView, mSpanStringBuilder,
+                mClickListener);
+
+        assertThat(linkifyResult).isTrue();
+    }
+
+    @Test
+    public void linkify_whenSpanStringWrong_shouldReturnFalse() {
+        final boolean linkifyResult = LinkifyUtils.linkify(mTextView, mWrongSpanStringBuilder,
+                mClickListener);
+
+        assertThat(linkifyResult).isFalse();
+    }
+
+    @Test
+    public void linkify_whenSpanStringCorrect_shouldContainClickableSpan() {
+        LinkifyUtils.linkify(mTextView, mSpanStringBuilder, mClickListener);
+        final Spannable spannableContent = (Spannable) mTextView.getText();
+        final int len = spannableContent.length();
+        final Object[] spans = spannableContent.getSpans(0, len, Object.class);
+
+        assertThat(spans[1] instanceof ClickableSpan).isTrue();
+    }
+}