[Testing] Use AndroidJUnit4 instead in DataUsageInfoControllerTest

1. Use AndroidJunit4 instead of RobolectricTestRunner
2. Use ApplicationProvider instead of RuntimeEnvironment to get context
3. Change Copy Right
4. Rename the test case for apply the naming rule

Bug: 167948471
Test: atest -c DataUsageInfoControllerTest
Change-Id: Id8591f77d6ab2840223501962ae19eaa2749f326

tests/unit/src/com/android/settings/datausage/DataUsageInfoControllerTest.java

@@ -0,0 +1,179 @@
+/*
+ * 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.datausage;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.net.NetworkPolicy;
+import android.net.NetworkTemplate;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import com.android.settingslib.net.DataUsageController.DataUsageInfo;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+@RunWith(AndroidJUnit4.class)
+public class DataUsageInfoControllerTest {
+
+    private static final int NEGATIVE = -1;
+    private static final int ZERO = 0;
+    private static final int POSITIVE_SMALL = 1;
+    private static final int POSITIVE_LARGE = 5;
+
+    private DataUsageInfoController mInfoController;
+    private DataUsageInfo info;
+
+    @Before
+    public void setUp()  {
+        mInfoController = new DataUsageInfoController();
+        info = new DataUsageInfo();
+    }
+
+    @Test
+    public void getSummaryLimit_LowUsageLowWarning_LimitUsed() {
+        info.warningLevel = POSITIVE_SMALL;
+        info.limitLevel = POSITIVE_LARGE;
+        info.usageLevel = POSITIVE_SMALL;
+
+        assertThat(mInfoController.getSummaryLimit(info)).isEqualTo(info.limitLevel);
+    }
+
+    @Test
+    public void getSummaryLimit_LowUsageEqualWarning_LimitUsed() {
+        info.warningLevel = POSITIVE_LARGE;
+        info.limitLevel = POSITIVE_LARGE;
+        info.usageLevel = POSITIVE_SMALL;
+
+        assertThat(mInfoController.getSummaryLimit(info)).isEqualTo(info.limitLevel);
+    }
+
+    @Test
+    public void getSummaryLimit_NoLimitNoUsage_WarningUsed() {
+        info.warningLevel = POSITIVE_LARGE;
+        info.limitLevel = ZERO;
+        info.usageLevel = ZERO;
+
+        assertThat(mInfoController.getSummaryLimit(info)).isEqualTo(info.warningLevel);
+    }
+
+    @Test
+    public void getSummaryLimit_NoLimitLowUsage_WarningUsed() {
+        info.warningLevel = POSITIVE_LARGE;
+        info.limitLevel = ZERO;
+        info.usageLevel = POSITIVE_SMALL;
+
+        assertThat(mInfoController.getSummaryLimit(info)).isEqualTo(info.warningLevel);
+    }
+
+    @Test
+    public void getSummaryLimit_LowWarningNoLimit_UsageUsed() {
+        info.warningLevel = POSITIVE_SMALL;
+        info.limitLevel = ZERO;
+        info.usageLevel = POSITIVE_LARGE;
+
+        assertThat(mInfoController.getSummaryLimit(info)).isEqualTo(info.usageLevel);
+    }
+
+    @Test
+    public void getSummaryLimit_LowWarningLowLimit_UsageUsed() {
+        info.warningLevel = POSITIVE_SMALL;
+        info.limitLevel = POSITIVE_SMALL;
+        info.usageLevel = POSITIVE_LARGE;
+
+        assertThat(mInfoController.getSummaryLimit(info)).isEqualTo(info.usageLevel);
+    }
+
+    private NetworkPolicy getDefaultNetworkPolicy() {
+        NetworkTemplate template =
+            new NetworkTemplate(NetworkTemplate.MATCH_WIFI_WILDCARD, null, null);
+        int cycleDay  = -1;
+        String cycleTimezone = "UTC";
+        long warningBytes = -1;
+        long limitBytes = -1;
+        return new NetworkPolicy(template, cycleDay, cycleTimezone, warningBytes, limitBytes, true);
+    }
+
+    @Test
+    public void updateDataLimit_NullArguments_NoError() {
+        mInfoController.updateDataLimit(null, null);
+        mInfoController.updateDataLimit(info, null);
+        mInfoController.updateDataLimit(null, getDefaultNetworkPolicy());
+    }
+
+    @Test
+    public void updateDataLimit_NegativeWarning_UpdatedToZero() {
+        NetworkPolicy policy = getDefaultNetworkPolicy();
+        policy.warningBytes = NEGATIVE;
+
+        mInfoController.updateDataLimit(info, policy);
+
+        assertThat(info.warningLevel).isEqualTo(ZERO);
+    }
+
+    @Test
+    public void updateDataLimit_WarningZero_UpdatedToZero() {
+        NetworkPolicy policy = getDefaultNetworkPolicy();
+        policy.warningBytes = ZERO;
+
+        mInfoController.updateDataLimit(info, policy);
+
+        assertThat(info.warningLevel).isEqualTo(ZERO);
+    }
+
+    @Test
+    public void updateDataLimit_WarningPositive_UpdatedToWarning() {
+        NetworkPolicy policy = getDefaultNetworkPolicy();
+        policy.warningBytes = POSITIVE_SMALL;
+
+        mInfoController.updateDataLimit(info, policy);
+
+        assertThat(info.warningLevel).isEqualTo(policy.warningBytes);
+    }
+
+    @Test
+    public void updateDataLimit_LimitNegative_UpdatedToZero() {
+        NetworkPolicy policy = getDefaultNetworkPolicy();
+        policy.limitBytes = NEGATIVE;
+
+        mInfoController.updateDataLimit(info, policy);
+
+        assertThat(info.limitLevel).isEqualTo(ZERO);
+    }
+
+    @Test
+    public void updateDataLimit_LimitZero_UpdatedToZero() {
+        NetworkPolicy policy = getDefaultNetworkPolicy();
+        policy.limitBytes = ZERO;
+
+        mInfoController.updateDataLimit(info, policy);
+
+        assertThat(info.limitLevel).isEqualTo(ZERO);
+    }
+
+    @Test
+    public void updateDataLimit_LimitPositive_UpdatedToLimit() {
+        NetworkPolicy policy = getDefaultNetworkPolicy();
+        policy.limitBytes = POSITIVE_SMALL;
+
+        mInfoController.updateDataLimit(info, policy);
+        
+        assertThat(info.limitLevel).isEqualTo(policy.limitBytes);
+    }
+}