1 files changed, 147 insertions, 0 deletions
diff --git a/quickstep/tests/src/com/android/quickstep/util/AppPairsControllerTest.kt b/quickstep/tests/src/com/android/quickstep/util/AppPairsControllerTest.kt
new file mode 100644
index 0000000000..1723844843
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+++ b/quickstep/tests/src/com/android/quickstep/util/AppPairsControllerTest.kt
@@ -0,0 +1,147 @@
+/*
+ * 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.quickstep.util
+
+import android.content.Context
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import com.android.launcher3.logging.StatsLogManager
+import com.android.launcher3.util.SplitConfigurationOptions.STAGE_POSITION_BOTTOM_OR_RIGHT
+import com.android.launcher3.util.SplitConfigurationOptions.STAGE_POSITION_TOP_OR_LEFT
+import com.android.wm.shell.common.split.SplitScreenConstants.SNAP_TO_30_70
+import com.android.wm.shell.common.split.SplitScreenConstants.SNAP_TO_50_50
+import com.android.wm.shell.common.split.SplitScreenConstants.SNAP_TO_70_30
+import org.junit.Assert.assertEquals
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.Mock
+import org.mockito.MockitoAnnotations
+
+@RunWith(AndroidJUnit4::class)
+class AppPairsControllerTest {
+    @Mock lateinit var context: Context
+    @Mock lateinit var splitSelectStateController: SplitSelectStateController
+    @Mock lateinit var statsLogManager: StatsLogManager
+
+    private lateinit var appPairsController: AppPairsController
+
+    private val left30: Int by lazy {
+        appPairsController.encodeRank(STAGE_POSITION_TOP_OR_LEFT, SNAP_TO_30_70)
+    }
+    private val left50: Int by lazy {
+        appPairsController.encodeRank(STAGE_POSITION_TOP_OR_LEFT, SNAP_TO_50_50)
+    }
+    private val left70: Int by lazy {
+        appPairsController.encodeRank(STAGE_POSITION_TOP_OR_LEFT, SNAP_TO_70_30)
+    }
+    private val right30: Int by lazy {
+        appPairsController.encodeRank(STAGE_POSITION_BOTTOM_OR_RIGHT, SNAP_TO_30_70)
+    }
+    private val right50: Int by lazy {
+        appPairsController.encodeRank(STAGE_POSITION_BOTTOM_OR_RIGHT, SNAP_TO_50_50)
+    }
+    private val right70: Int by lazy {
+        appPairsController.encodeRank(STAGE_POSITION_BOTTOM_OR_RIGHT, SNAP_TO_70_30)
+    }
+
+    @Before
+    fun setup() {
+        MockitoAnnotations.initMocks(this)
+        appPairsController =
+            AppPairsController(context, splitSelectStateController, statsLogManager)
+    }
+
+    @Test
+    fun shouldEncodeRankCorrectly() {
+        assertEquals("left + 30-70 should encode as 0 (0b0)", 0, left30)
+        assertEquals("left + 50-50 should encode as 1 (0b1)", 1, left50)
+        assertEquals("left + 70-30 should encode as 2 (0b10)", 2, left70)
+        // See AppPairsController#BITMASK_SIZE and BITMASK_FOR_SNAP_POSITION for context
+        assertEquals("right + 30-70 should encode as 1 followed by 16 0s", 1 shl 16, right30)
+        assertEquals("right + 50-50 should encode as the above value + 1", (1 shl 16) + 1, right50)
+        assertEquals("right + 70-30 should encode as the above value + 2", (1 shl 16) + 2, right70)
+    }
+
+    @Test
+    fun shouldDecodeRankCorrectly() {
+        assertEquals(
+            "left + 30-70 should decode to left",
+            STAGE_POSITION_TOP_OR_LEFT,
+            AppPairsController.convertRankToStagePosition(left30),
+        )
+        assertEquals(
+            "left + 30-70 should decode to 30-70",
+            SNAP_TO_30_70,
+            AppPairsController.convertRankToSnapPosition(left30),
+        )
+
+        assertEquals(
+            "left + 50-50 should decode to left",
+            STAGE_POSITION_TOP_OR_LEFT,
+            AppPairsController.convertRankToStagePosition(left50),
+        )
+        assertEquals(
+            "left + 50-50 should decode to 50-50",
+            SNAP_TO_50_50,
+            AppPairsController.convertRankToSnapPosition(left50),
+        )
+
+        assertEquals(
+            "left + 70-30 should decode to left",
+            STAGE_POSITION_TOP_OR_LEFT,
+            AppPairsController.convertRankToStagePosition(left70),
+        )
+        assertEquals(
+            "left + 70-30 should decode to 70-30",
+            SNAP_TO_70_30,
+            AppPairsController.convertRankToSnapPosition(left70),
+        )
+
+        assertEquals(
+            "right + 30-70 should decode to right",
+            STAGE_POSITION_BOTTOM_OR_RIGHT,
+            AppPairsController.convertRankToStagePosition(right30),
+        )
+        assertEquals(
+            "right + 30-70 should decode to 30-70",
+            SNAP_TO_30_70,
+            AppPairsController.convertRankToSnapPosition(right30),
+        )
+
+        assertEquals(
+            "right + 50-50 should decode to right",
+            STAGE_POSITION_BOTTOM_OR_RIGHT,
+            AppPairsController.convertRankToStagePosition(right50),
+        )
+        assertEquals(
+            "right + 50-50 should decode to 50-50",
+            SNAP_TO_50_50,
+            AppPairsController.convertRankToSnapPosition(right50),
+        )
+
+        assertEquals(
+            "right + 70-30 should decode to right",
+            STAGE_POSITION_BOTTOM_OR_RIGHT,
+            AppPairsController.convertRankToStagePosition(right70),
+        )
+        assertEquals(
+            "right + 70-30 should decode to 70-30",
+            SNAP_TO_70_30,
+            AppPairsController.convertRankToSnapPosition(right70),
+        )
+    }
+}