Added test for MaterialColorUtils

lib/javatests/com/google/android/material/color/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Copyright 2019 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.
+  -->
+
+<manifest xmlns:tools="http://schemas.android.com/tools"
+  package="com.google.android.material.color">
+
+  <uses-sdk
+    tools:overrideLibrary="androidx.test.core"/>
+
+  <application/>
+</manifest>

lib/javatests/com/google/android/material/color/MaterialColorUtilsTest.java

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+/*
+ * Copyright (C) 2019 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.google.android.material.color;
+
+import android.content.Context;
+import android.view.View;
+import androidx.annotation.AttrRes;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.test.core.app.ApplicationProvider;
+import com.google.android.material.R;
+import com.google.android.material.button.MaterialButton;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.Robolectric;
+import org.robolectric.RobolectricTestRunner;
+import org.robolectric.annotation.internal.DoNotInstrument;
+
+import static com.google.common.truth.Truth.assertThat;
+
+/** Tests for the Material themes. */
+@RunWith(RobolectricTestRunner.class)
+@DoNotInstrument
+public class MaterialColorUtilsTest {
+
+  private static final String TAG = MaterialColorUtilsTest.class.getSimpleName();
+
+  private AppCompatActivity activity;
+  private final Context context = ApplicationProvider.getApplicationContext();
+
+  @Before
+  public void themeApplicationContext() {
+    context.setTheme(R.style.Theme_MaterialComponents_Light_NoActionBar_Bridge);
+    activity = Robolectric.buildActivity(AppCompatActivity.class).setup().get();
+  }
+
+  @Test
+  public void testMaterialColor_usingContext() {
+    context.setTheme(R.style.Theme_MaterialComponents_Light);
+    assertThat(MaterialColorUtils.colorPrimary(context)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorPrimaryVariant(context)).isEqualTo(getColor(R.attr.colorPrimaryVariant));
+    assertThat(MaterialColorUtils.colorOnPrimary(context)).isEqualTo(getColor(R.attr.colorOnPrimary));
+    assertThat(MaterialColorUtils.colorSecondary(context)).isEqualTo(getColor(R.attr.colorSecondary));
+    assertThat(MaterialColorUtils.colorSecondaryVariant(context)).isEqualTo(getColor(R.attr.colorSecondaryVariant));
+    assertThat(MaterialColorUtils.colorOnSecondary(context)).isEqualTo(getColor(R.attr.colorOnSecondary));
+    assertThat(MaterialColorUtils.colorSurface(context)).isEqualTo(getColor(R.attr.colorSurface));
+    assertThat(MaterialColorUtils.colorOnSurface(context)).isEqualTo(getColor(R.attr.colorOnSurface));
+    assertThat(MaterialColorUtils.colorBackground(context)).isEqualTo(getColor(android.R.attr.colorBackground));
+    assertThat(MaterialColorUtils.colorOnBackground(context)).isEqualTo(getColor(R.attr.colorOnBackground));
+    assertThat(MaterialColorUtils.colorError(context)).isEqualTo(getColor(R.attr.colorError));
+    assertThat(MaterialColorUtils.colorOnError(context)).isEqualTo(getColor(R.attr.colorOnError));
+  }
+
+  @Test
+  public void testMaterialColor_usingView() {
+    View inflated = activity.getLayoutInflater().inflate(R.layout.test_color_view, null);
+    MaterialButton view = inflated.findViewById(R.id.viewTestColor);
+    assertThat(MaterialColorUtils.colorPrimary(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorPrimaryVariant(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorOnPrimary(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorSecondary(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorSecondaryVariant(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorOnSecondary(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorSurface(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorOnSurface(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorBackground(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorOnBackground(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorError(view)).isEqualTo(getColor(R.attr.colorPrimary));
+    assertThat(MaterialColorUtils.colorOnError(view)).isEqualTo(getColor(R.attr.colorPrimary));
+  }
+
+  private int getColor(@AttrRes int colorAttributeResId) {
+    return MaterialColors.getColor(context, colorAttributeResId, TAG);
+  }
+}

lib/javatests/com/google/android/material/color/res/layout/test_color_view.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2018 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.
+-->
+
+<com.google.android.material.button.MaterialButton
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/viewTestColor"
+    style="@style/Widget.MaterialComponents.Button"
+    android:theme="@style/ThemeOverlay.Test.AllColor"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:ellipsize="end"
+    android:text="@string/chip_text" />

lib/javatests/com/google/android/material/color/res/values/styles.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright 2018 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
+  ~
+  ~     https://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.
+  -->
+
+<resources xmlns:tools="http://schemas.android.com/tools">
+
+  <style name="ThemeOverlay.Test.AllColor" parent="" tools:ignore="NewApi">
+
+    <item name="colorPrimaryVariant">?attr/colorPrimary</item>
+    <item name="colorOnPrimary">?attr/colorPrimary</item>
+    <item name="colorSecondary">?attr/colorPrimary</item>
+    <item name="colorOnSecondary">?attr/colorPrimary</item>
+    <item name="colorSecondaryVariant">?attr/colorPrimary</item>
+    <item name="colorSurface">?attr/colorPrimary</item>
+    <item name="colorOnSurface">?attr/colorPrimary</item>
+    <item name="android:colorBackground">?attr/colorPrimary</item>
+    <item name="colorOnBackground">?attr/colorPrimary</item>
+    <item name="colorError">?attr/colorPrimary</item>
+    <item name="colorOnError">?attr/colorPrimary</item>
+  </style>
+
+</resources>