Add unit tests for com.ctrip.framework.apollo.core.utils.StringUtils

These tests were written using Diffblue Cover

apollo-core/src/test/java/com/ctrip/framework/apollo/core/utils/StringUtilsTest.java

+package com.ctrip.framework.apollo.core.utils;
+
+import com.ctrip.framework.apollo.core.utils.StringUtils;
+import org.junit.Assert;
+import org.junit.Rule;
+import org.junit.Test;
+
+import java.util.ArrayList;
+
+public class StringUtilsTest {
+
+  @Test
+  public void testEqualsIgnoreCase() {
+    Assert.assertFalse(StringUtils.equalsIgnoreCase(",", "foo"));
+    Assert.assertFalse(StringUtils.equalsIgnoreCase(null, "??"));
+    Assert.assertTrue(StringUtils.equalsIgnoreCase(null, null));
+    Assert.assertTrue(StringUtils.equalsIgnoreCase("foo", "Foo"));
+  }
+
+  @Test
+  public void testEquals() {
+    Assert.assertFalse(StringUtils.equals(null, ""));
+    Assert.assertTrue(StringUtils.equals(null, null));
+    Assert.assertTrue(StringUtils.equals("3", "3"));
+  }
+
+  @Test
+  public void testIsBlank() {
+    Assert.assertFalse(StringUtils.isBlank("\'"));
+    Assert.assertTrue(StringUtils.isBlank(""));
+    Assert.assertTrue(StringUtils.isBlank(null));
+  }
+
+  @Test
+  public void testIsContainEmpty() {
+    Assert.assertFalse(StringUtils.isContainEmpty(null));
+    Assert.assertFalse(StringUtils.isContainEmpty(new String[] {}));
+    Assert.assertFalse(StringUtils.isContainEmpty(new String[] {"1"}));
+    Assert.assertTrue(StringUtils.isContainEmpty(new String[] {null}));
+  }
+
+  @Test
+  public void testIsEmpty() {
+    Assert.assertFalse(StringUtils.isEmpty("1"));
+    Assert.assertTrue(StringUtils.isEmpty(null));
+    Assert.assertTrue(StringUtils.isEmpty(""));
+  }
+
+  @Test
+  public void testIsNumeric() {
+    Assert.assertFalse(StringUtils.isNumeric(null));
+    Assert.assertFalse(StringUtils.isNumeric("\'"));
+    Assert.assertTrue(StringUtils.isNumeric("1"));
+  }
+
+  @Test
+  public void testJoin() {
+    Assert.assertEquals("", StringUtils.join(new ArrayList(), "1a 2b 3c"));
+
+    ArrayList collection = new ArrayList();
+    collection.add(null);
+    Assert.assertEquals("", StringUtils.join(collection, "1a 2b 3c"));
+
+    collection = new ArrayList();
+    collection.add(-2_147_483_648);
+    Assert.assertEquals("-2147483648", StringUtils.join(collection, "1a 2b 3c"));
+  }
+
+  @Test
+  public void testStartsWithIgnoreCase() {
+    Assert.assertFalse(StringUtils.startsWithIgnoreCase("A1B2C3", "BAZ"));
+    Assert.assertFalse(StringUtils.startsWithIgnoreCase(",", "BAZ"));
+    Assert.assertTrue(StringUtils.startsWithIgnoreCase("bar", "BAR"));
+  }
+
+  @Test
+  public void testStartsWith() {
+    Assert.assertFalse(StringUtils.startsWith("1234", "1a 2b 3c"));
+    Assert.assertTrue(StringUtils.startsWith("1a 2b 3c", "1a 2b 3c"));
+    Assert.assertTrue(StringUtils.startsWith(null, null));
+  }
+
+  @Test
+  public void testTrim() {
+    Assert.assertEquals("1234", StringUtils.trim("1234"));
+    Assert.assertNull(StringUtils.trim(null));
+  }
+
+  @Test
+  public void testTrimToEmpty() {
+    Assert.assertEquals("1234", StringUtils.trimToEmpty("1234"));
+    Assert.assertEquals("", StringUtils.trimToEmpty(null));
+  }
+
+  @Test
+  public void trimToNull() {
+    Assert.assertNull(StringUtils.trimToNull(null));
+    Assert.assertEquals("foo", StringUtils.trimToNull("foo"));
+  }
+}