Refactor hotspot into a full page

- Deprecated WifiAPEnabler, and copied most of its logic into various
  controllers and WifiTetherSettings.
- Added tests

Fix: 37253404
Fix: 36181835

Test: make RunSettingsRoboTests
Change-Id: Iad994d61b694ad7f1113d045a3e7500eeaec178b

tests/robotests/src/com/android/settings/wifi/WifiUtilsTest.java

@@ -0,0 +1,52 @@
+/*
+ * 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 com.android.settings.wifi;
+
+
+import com.android.settings.TestConfig;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.annotation.Config;
+
+import static com.google.common.truth.Truth.assertThat;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class WifiUtilsTest {
+
+    @Test
+    public void testSSID() {
+        assertThat(WifiUtils.isSSIDTooLong("123")).isFalse();
+        assertThat(WifiUtils.isSSIDTooLong("☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎☎")).isTrue();
+
+        assertThat(WifiUtils.isSSIDTooShort("123")).isFalse();
+        assertThat(WifiUtils.isSSIDTooShort("")).isTrue();
+    }
+
+    @Test
+    public void testPassword() {
+        final String longPassword = "123456789012345678901234567890"
+                + "1234567890123456789012345678901234567890";
+        assertThat(WifiUtils.isPasswordValid("123")).isFalse();
+        assertThat(WifiUtils.isPasswordValid("12345678")).isTrue();
+        assertThat(WifiUtils.isPasswordValid("1234567890")).isTrue();
+        assertThat(WifiUtils.isPasswordValid(longPassword)).isFalse();
+    }
+
+}