diff --git a/tests/unit/src/com/android/settings/datausage/DataUsageInfoControllerTest.java b/tests/unit/src/com/android/settings/datausage/DataUsageInfoControllerTest.java
new file mode 100644
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+++ b/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);
+    }
+}
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