1 files changed, 104 insertions, 0 deletions
diff --git a/tests/src/org/kelar/inputmethod/latin/utils/CollectionUtilsTests.java b/tests/src/org/kelar/inputmethod/latin/utils/CollectionUtilsTests.java
new file mode 100644
index 000000000..390e88828
--- /dev/null
+++ b/tests/src/org/kelar/inputmethod/latin/utils/CollectionUtilsTests.java
@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2014 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 org.kelar.inputmethod.latin.utils;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import androidx.test.filters.SmallTest;
+import androidx.test.runner.AndroidJUnit4;
+
+import org.kelar.inputmethod.latin.common.CollectionUtils;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Tests for {@link CollectionUtils}.
+ */
+@SmallTest
+@RunWith(AndroidJUnit4.class)
+public class CollectionUtilsTests {
+    /**
+     * Tests that {@link CollectionUtils#arrayAsList(Object[],int,int)} fails as expected
+     * with some invalid inputs.
+     */
+    @Test
+    public void testArrayAsListFailure() {
+        final String[] array = { "0", "1" };
+        // Negative start
+        try {
+            CollectionUtils.arrayAsList(array, -1, 1);
+            fail("Failed to catch start < 0");
+        } catch (final IllegalArgumentException e) {
+            assertEquals("Invalid start: -1 end: 1 with array.length: 2", e.getMessage());
+        }
+        // start > end
+        try {
+            CollectionUtils.arrayAsList(array, 1, -1);
+            fail("Failed to catch start > end");
+        } catch (final IllegalArgumentException e) {
+            assertEquals("Invalid start: 1 end: -1 with array.length: 2", e.getMessage());
+        }
+        // end > array.length
+        try {
+            CollectionUtils.arrayAsList(array, 1, 3);
+            fail("Failed to catch end > array.length");
+        } catch (final IllegalArgumentException e) {
+            assertEquals("Invalid start: 1 end: 3 with array.length: 2", e.getMessage());
+        }
+    }
+
+    /**
+     * Tests that {@link CollectionUtils#arrayAsList(Object[],int,int)} gives the expected
+     * results for a few valid inputs.
+     */
+    @Test
+    public void testArrayAsList() {
+        final ArrayList<String> empty = new ArrayList<>();
+        assertEquals(empty, CollectionUtils.arrayAsList(new String[] {}, 0, 0));
+        final String[] array = { "0", "1", "2", "3", "4" };
+        assertEquals(empty, CollectionUtils.arrayAsList(array, 0, 0));
+        assertEquals(empty, CollectionUtils.arrayAsList(array, 1, 1));
+        assertEquals(empty, CollectionUtils.arrayAsList(array, array.length, array.length));
+        final ArrayList<String> expected123 = new ArrayList<>(Arrays.asList("1", "2", "3"));
+        assertEquals(expected123, CollectionUtils.arrayAsList(array, 1, 4));
+    }
+
+    /**
+     * Tests that {@link CollectionUtils#isNullOrEmpty(java.util.Collection)} gives the expected
+     * results for a few cases.
+     */
+    @Test
+    public void testIsNullOrEmpty() {
+        assertTrue(CollectionUtils.isNullOrEmpty((List<String>) null));
+        assertTrue(CollectionUtils.isNullOrEmpty((Map<String, String>) null));
+        assertTrue(CollectionUtils.isNullOrEmpty(new ArrayList<String>()));
+        assertTrue(CollectionUtils.isNullOrEmpty(new HashMap<String, String>()));
+        assertFalse(CollectionUtils.isNullOrEmpty(Collections.singletonList("Not empty")));
+        assertFalse(CollectionUtils.isNullOrEmpty(Collections.singletonMap("Not", "empty")));
+    }
+}