Add unit tests for com.alibaba.druid.util.StringUtils

src/test/java/com/alibaba/druid/util/StringUtilsTest.java

@@ -0,0 +1,153 @@
+/*
+ * Copyright 1999-2019 Alibaba Group Holding Ltd.
+ *
+ * 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.alibaba.druid.util;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class StringUtilsTest {
+
+    @Test
+    public void testSubStringToInteger() {
+        Assert.assertNull(StringUtils.subStringToInteger("foobar", "1", "3"));
+
+        Assert.assertEquals(new Integer(2),
+                StringUtils.subStringToInteger("1234", "1", "3"));
+    }
+
+    @Test
+    public void testSubString() {
+        Assert.assertNull(StringUtils.subString(",", "foo", ","));
+        Assert.assertNull(
+                StringUtils.subString("foo", "foo", "a\'b\'c", false));
+        Assert.assertNull(
+                StringUtils.subString("foo", "foo", "a\'b\'c", true));
+
+        Assert.assertEquals("a 2b ",
+                StringUtils.subString("1a 2b 3c", "1", "3"));
+        Assert.assertEquals("c",
+                StringUtils.subString("abcdef", "b", "d", true));
+    }
+
+    @Test
+    public void testStringToInteger() {
+        Assert.assertNull(StringUtils.stringToInteger(""));
+        Assert.assertNull(StringUtils.stringToInteger(null));
+        Assert.assertNull(StringUtils.stringToInteger("a"));
+
+        Assert.assertEquals(new Integer(3), StringUtils.stringToInteger("3"));
+    }
+
+    @Test
+    public void testEquals() {
+        Assert.assertFalse(StringUtils.equals(null, ""));
+        Assert.assertFalse(StringUtils.equals("foo", "bar"));
+        Assert.assertFalse(StringUtils.equals("foo", "FOO"));
+
+        Assert.assertTrue(StringUtils.equals(null, null));
+        Assert.assertTrue(StringUtils.equals("foo", "foo"));
+    }
+
+    @Test
+    public void testEqualsIgnoreCase() {
+        Assert.assertFalse(StringUtils.equalsIgnoreCase(null, ""));
+        Assert.assertFalse(StringUtils.equalsIgnoreCase("foo", "bar"));
+
+        Assert.assertTrue(StringUtils.equalsIgnoreCase(null, null));
+        Assert.assertTrue(StringUtils.equalsIgnoreCase("foo", "foo"));
+        Assert.assertTrue(StringUtils.equalsIgnoreCase("foo", "FOO"));
+    }
+
+    @Test
+    public void testIsEmpty() {
+        Assert.assertTrue(StringUtils.isEmpty(null));
+        Assert.assertTrue(StringUtils.isEmpty(""));
+
+        Assert.assertFalse(StringUtils.isEmpty(" "));
+        Assert.assertFalse(StringUtils.isEmpty("foo"));
+    }
+
+    @Test
+    public void testLowerHashCode() {
+        Assert.assertEquals(0, StringUtils.lowerHashCode(""));
+        Assert.assertEquals(0, StringUtils.lowerHashCode(null));
+        Assert.assertEquals(97299, StringUtils.lowerHashCode("Bar"));
+    }
+
+    @Test
+    public void testIsNumberStringInput() {
+        Assert.assertTrue(StringUtils.isNumber("-0x3"));
+        Assert.assertTrue(StringUtils.isNumber("2"));
+        Assert.assertTrue(StringUtils.isNumber("5L"));
+        Assert.assertTrue(StringUtils.isNumber("0e+3"));
+
+        Assert.assertFalse(StringUtils.isNumber(""));
+        Assert.assertFalse(StringUtils.isNumber("-0x"));
+        Assert.assertFalse(StringUtils.isNumber("0xh"));
+        Assert.assertFalse(StringUtils.isNumber("0x\u0018"));
+        Assert.assertFalse(StringUtils.isNumber("0xAc\u8040????????"));
+        Assert.assertFalse(
+                StringUtils.isNumber("0x3c\\u8040????????????????????????"));
+        Assert.assertFalse(StringUtils.isNumber("..."));
+        Assert.assertFalse(StringUtils.isNumber("-0eE#"));
+        Assert.assertFalse(StringUtils.isNumber("E.."));
+        Assert.assertFalse(StringUtils.isNumber("2.+L"));
+        Assert.assertFalse(StringUtils.isNumber("a/b/c"));
+        Assert.assertFalse(StringUtils.isNumber("E"));
+        Assert.assertFalse(StringUtils.isNumber("e"));
+        Assert.assertFalse(StringUtils.isNumber("-d"));
+        Assert.assertFalse(StringUtils.isNumber("-D"));
+        Assert.assertFalse(StringUtils.isNumber("-f"));
+        Assert.assertFalse(StringUtils.isNumber("-F"));
+        Assert.assertFalse(StringUtils.isNumber("-l"));
+        Assert.assertFalse(StringUtils.isNumber("\'"));
+        Assert.assertFalse(StringUtils.isNumber("-"));
+    }
+
+    @Test
+    public void testIsNumberCharArrayInput() {
+        Assert.assertTrue(
+                StringUtils.isNumber(new char[]{'-', '0', 'x', 'a'}));
+        Assert.assertTrue(StringUtils.isNumber(new char[]{'-', '.', '1'}));
+        Assert.assertTrue(StringUtils.isNumber(new char[]{'6', 'l'}));
+        Assert.assertTrue(
+                StringUtils.isNumber(new char[]{'0', 'e', '+', '3'}));
+
+        Assert.assertFalse(StringUtils.isNumber(new char[0]));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'0', 'x'}));
+        Assert.assertFalse(
+                StringUtils.isNumber(new char[]{'-', '0', 'x', '9', ' '}));
+        Assert.assertFalse(
+                StringUtils.isNumber(new char[]{'-', '0', 'x', '9', 'i'}));
+        Assert.assertFalse(
+                StringUtils.isNumber(new char[]{'-', '.', '.', 'a'}));
+        Assert.assertFalse(StringUtils.isNumber(
+                new char[]{'-', '1', 'e', 'E', '\u0000', '\u0000', '\u0000'}));
+        Assert.assertFalse(
+                StringUtils.isNumber(new char[]{'-', '.', 'E', 'a'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'+', '\u0016'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{';', '\u0016'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'-', '9', 'e'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'-', '.', 'f'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'-', '.', 'F'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'-', '.', 'd'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'-', '.', 'D'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'-', '.', 'l'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'5', 't'}));
+        Assert.assertFalse(StringUtils.isNumber(new char[]{'-'}));
+    }
+}