[test] Wrote an abstract class for common test cases of int list

Author: mta452

tehreer-android/src/test/java/com/mta/tehreer/collections/IntListTestSuite.java

@@ -0,0 +1,94 @@
+/*
+ * Copyright (C) 2018 Muhammad Tayyab Akram
+ *
+ * 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.mta.tehreer.collections;
+
+import org.junit.Test;
+
+import java.util.Arrays;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+public abstract class IntListTestSuite {
+    protected IntList actual;
+    protected int[] expected;
+
+    protected IntListTestSuite() {
+    }
+
+    @Test
+    public void testSize() {
+        assertEquals(actual.size(), expected.length);
+    }
+
+    @Test
+    public void testElements() {
+        for (int i = 0; i < expected.length; i++) {
+            assertEquals(actual.get(i), expected[i]);
+        }
+    }
+
+    @Test
+    public void testCopyFull() {
+        int[] array = new int[expected.length];
+        actual.copyTo(array, 0);
+
+        assertArrayEquals(array, expected);
+    }
+
+    @Test
+    public void testCopyAtStart() {
+        int actualLength = expected.length;
+        int extraLength = actualLength / 2;
+
+        int[] extra = new int[extraLength];
+        int[] array = new int[actualLength + extraLength];
+        actual.copyTo(array, 0);
+
+        int[] copiedChunk = Arrays.copyOfRange(array, 0, actualLength);
+        int[] lastChunk = Arrays.copyOfRange(array, actualLength, array.length);
+
+        assertArrayEquals(copiedChunk, expected);
+        assertArrayEquals(lastChunk, extra);
+    }
+
+    @Test
+    public void testCopyAtEnd() {
+        int actualLength = expected.length;
+        int extraLength = actualLength / 2;
+
+        int[] extra = new int[extraLength];
+        int[] array = new int[actualLength + extraLength];
+        actual.copyTo(array, extraLength);
+
+        int[] firstChunk = Arrays.copyOfRange(array, 0, extraLength);
+        int[] copiedChunk = Arrays.copyOfRange(array, extraLength, array.length);
+
+        assertArrayEquals(firstChunk, extra);
+        assertArrayEquals(copiedChunk, expected);
+    }
+
+    @Test
+    public void testToArray() {
+        assertArrayEquals(actual.toArray(), expected);
+    }
+
+    @Test
+    public void testEquals() {
+        assertEquals(actual, IntList.of(expected));
+    }
+}