Moving some utility tests to instrumentation tests

> Also removing some UI tests which are already covered by instrumentation

Bug: 196825541
Test: Presubmit
Change-Id: Ib39a81589d0bf55278623a596d444b752ca696e6

tests/src/com/android/launcher3/util/IntArrayTest.java

@@ -0,0 +1,41 @@
+/*
+ * 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.android.launcher3.util;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+import androidx.test.filters.SmallTest;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+/**
+ * Unit tests for {@link IntArray}
+ */
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class IntArrayTest {
+
+    @Test
+    public void concatAndParseString() {
+        int[] array = new int[] {0, 2, 3, 9};
+        String concat = IntArray.wrap(array).toConcatString();
+
+        int[] parsed = IntArray.fromConcatString(concat).toArray();
+        assertThat(array).isEqualTo(parsed);
+    }
+}