1 files changed, 107 insertions, 0 deletions
diff --git a/tests/src/com/android/customization/model/mode/DarkModeSnapshotRestorerTest.kt b/tests/src/com/android/customization/model/mode/DarkModeSnapshotRestorerTest.kt
new file mode 100644
index 00000000..38067b75
--- /dev/null
+++ b/tests/src/com/android/customization/model/mode/DarkModeSnapshotRestorerTest.kt
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2023 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.customization.model.mode
+
+import androidx.test.filters.SmallTest
+import com.android.wallpaper.testing.FakeSnapshotStore
+import com.google.common.truth.Truth.assertThat
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.test.StandardTestDispatcher
+import kotlinx.coroutines.test.TestScope
+import kotlinx.coroutines.test.runTest
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.junit.runners.JUnit4
+
+@OptIn(ExperimentalCoroutinesApi::class)
+@SmallTest
+@RunWith(JUnit4::class)
+class DarkModeSnapshotRestorerTest {
+
+    private lateinit var underTest: DarkModeSnapshotRestorer
+    private lateinit var testScope: TestScope
+
+    private var isActive = false
+
+    @Before
+    fun setUp() {
+        val testDispatcher = StandardTestDispatcher()
+        testScope = TestScope(testDispatcher)
+        underTest =
+            DarkModeSnapshotRestorer(
+                backgroundDispatcher = testDispatcher,
+                isActive = { isActive },
+                setActive = { isActive = it },
+            )
+    }
+
+    @Test
+    fun `set up and restore - active`() =
+        testScope.runTest {
+            isActive = true
+
+            val store = FakeSnapshotStore()
+            store.store(underTest.setUpSnapshotRestorer(store = store))
+            val storedSnapshot = store.retrieve()
+
+            underTest.restoreToSnapshot(snapshot = storedSnapshot)
+            assertThat(isActive).isTrue()
+        }
+
+    @Test
+    fun `set up and restore - inactive`() =
+        testScope.runTest {
+            isActive = false
+
+            val store = FakeSnapshotStore()
+            store.store(underTest.setUpSnapshotRestorer(store = store))
+            val storedSnapshot = store.retrieve()
+
+            underTest.restoreToSnapshot(snapshot = storedSnapshot)
+            assertThat(isActive).isFalse()
+        }
+
+    @Test
+    fun `set up - deactivate - restore to active`() =
+        testScope.runTest {
+            isActive = true
+            val store = FakeSnapshotStore()
+            store.store(underTest.setUpSnapshotRestorer(store = store))
+            val initialSnapshot = store.retrieve()
+
+            underTest.store(isActivated = false)
+
+            underTest.restoreToSnapshot(snapshot = initialSnapshot)
+            assertThat(isActive).isTrue()
+        }
+
+    @Test
+    fun `set up - activate - restore to inactive`() =
+        testScope.runTest {
+            isActive = false
+            val store = FakeSnapshotStore()
+            store.store(underTest.setUpSnapshotRestorer(store = store))
+            val initialSnapshot = store.retrieve()
+
+            underTest.store(isActivated = true)
+
+            underTest.restoreToSnapshot(snapshot = initialSnapshot)
+            assertThat(isActive).isFalse()
+        }
+}