diff --git a/src/test/java/org/apache/commons/lang3/CharRangeTest.java b/src/test/java/org/apache/commons/lang3/CharRangeTest.java
index 575d7809f..b36e43e7a 100644
--- a/src/test/java/org/apache/commons/lang3/CharRangeTest.java
+++ b/src/test/java/org/apache/commons/lang3/CharRangeTest.java
@@ -397,4 +397,11 @@ public void testSerialization() {
         assertEquals(range, SerializationUtils.clone(range)); 
     }
 
+    //-----------------------------------------------------------------------
+    @Test(expected = UnsupportedOperationException.class)
+    public void testIteratorRemove() {
+        CharRange a = CharRange.is('a');
+        final Iterator<Character> aIt = a.iterator();
+        aIt.remove();
+    }
 }
diff --git a/src/test/java/org/apache/commons/lang3/RandomUtilsTest.java b/src/test/java/org/apache/commons/lang3/RandomUtilsTest.java
index a46a36ab8..ed032e70e 100644
--- a/src/test/java/org/apache/commons/lang3/RandomUtilsTest.java
+++ b/src/test/java/org/apache/commons/lang3/RandomUtilsTest.java
@@ -16,12 +16,17 @@
  */
 package org.apache.commons.lang3;
 
+import static junit.framework.TestCase.assertNotNull;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
 
 import org.junit.Test;
 
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Modifier;
+
 /**
  * Tests for {@link RandomUtils}
  */
@@ -32,6 +37,15 @@ public class RandomUtilsTest {
      */
     private static final double DELTA = 1e-5;
 
+    @Test
+    public void testConstructor() {
+        assertNotNull(new RandomUtils());
+        final Constructor<?>[] cons = RandomUtils.class.getDeclaredConstructors();
+        assertEquals(1, cons.length);
+        assertTrue(Modifier.isPublic(cons[0].getModifiers()));
+        assertTrue(Modifier.isPublic(RandomUtils.class.getModifiers()));
+        assertFalse(Modifier.isFinal(RandomUtils.class.getModifiers()));
+    }
 
     @Test(expected = IllegalArgumentException.class)
     public void testNextBytesNegative() throws Exception {
@@ -78,6 +92,15 @@ public void testNextFloatLowerGreaterUpper() throws Exception {
         RandomUtils.nextFloat(2, 1);
     }
 
+    /**
+     * Tests next boolean
+     */
+    @Test
+    public void testBoolean() {
+        boolean result = RandomUtils.nextBoolean();
+        assertTrue(result == true || result == false);
+    }
+
     /**
      * Tests a zero byte array length.
      */
diff --git a/src/test/java/org/apache/commons/lang3/StringEscapeUtilsTest.java b/src/test/java/org/apache/commons/lang3/StringEscapeUtilsTest.java
index 815dc966f..b279c3121 100644
--- a/src/test/java/org/apache/commons/lang3/StringEscapeUtilsTest.java
+++ b/src/test/java/org/apache/commons/lang3/StringEscapeUtilsTest.java
@@ -199,6 +199,29 @@ public void testEscapeEcmaScript() {
                 StringEscapeUtils.escapeEcmaScript("document.getElementById(\"test\").value = '<script>alert('aaa');</script>';"));
     }
 
+    @Test
+    public void testUnescapeEcmaScript() {
+        assertEquals(null, StringEscapeUtils.escapeEcmaScript(null));
+        try {
+            StringEscapeUtils.UNESCAPE_ECMASCRIPT.translate(null, null);
+            fail();
+        } catch (final IOException ex) {
+            fail();
+        } catch (final IllegalArgumentException ex) {
+        }
+        try {
+            StringEscapeUtils.UNESCAPE_ECMASCRIPT.translate("", null);
+            fail();
+        } catch (final IOException ex) {
+            fail();
+        } catch (final IllegalArgumentException ex) {
+        }
+
+        assertEquals("He didn't say, \"stop!\"", StringEscapeUtils.unescapeEcmaScript("He didn\\'t say, \\\"stop!\\\""));
+        assertEquals("document.getElementById(\"test\").value = '<script>alert('aaa');</script>';",
+                StringEscapeUtils.unescapeEcmaScript("document.getElementById(\\\"test\\\").value = \\'<script>alert(\\'aaa\\');<\\/script>\\';"));
+    }
+
 
     // HTML and XML
     //--------------------------------------------------------------
@@ -470,6 +493,12 @@ private void checkCsvEscapeWriter(final String expected, final String value) {
         }
     }
 
+    @Test(expected = IllegalStateException.class)
+    public void testEscapeCsvIllegalStateException() throws IOException {
+        final StringWriter writer = new StringWriter();
+        StringEscapeUtils.ESCAPE_CSV.translate("foo", -1, writer);
+    }
+
     @Test
     public void testUnescapeCsvString() throws Exception {
         assertEquals("foo.bar",              StringEscapeUtils.unescapeCsv("foo.bar"));
@@ -508,6 +537,12 @@ private void checkCsvUnescapeWriter(final String expected, final String value) {
         }
     }
 
+    @Test(expected = IllegalStateException.class)
+        public void testUnescapeCsvIllegalStateException() throws IOException {
+        final StringWriter writer = new StringWriter();
+        StringEscapeUtils.UNESCAPE_CSV.translate("foo", -1, writer);
+    }
+
     /**
      * Tests // https://issues.apache.org/jira/browse/LANG-480
      */
@@ -613,4 +648,29 @@ public void testEscapeJson() {
         assertEquals(expected, StringEscapeUtils.escapeJson(input));
     }
 
+    @Test
+    public void testUnescapeJson() {
+        assertEquals(null, StringEscapeUtils.unescapeJson(null));
+        try {
+            StringEscapeUtils.UNESCAPE_JSON.translate(null, null);
+            fail();
+        } catch (final IOException ex) {
+            fail();
+        } catch (final IllegalArgumentException ex) {
+        }
+        try {
+            StringEscapeUtils.UNESCAPE_JSON.translate("", null);
+            fail();
+        } catch (final IOException ex) {
+            fail();
+        } catch (final IllegalArgumentException ex) {
+        }
+
+        assertEquals("He didn't say, \"stop!\"", StringEscapeUtils.unescapeJson("He didn't say, \\\"stop!\\\""));
+
+        final String expected ="\"foo\" isn't \"bar\". specials: \b\r\n\f\t\\/";
+        final String input = "\\\"foo\\\" isn't \\\"bar\\\". specials: \\b\\r\\n\\f\\t\\\\\\/";
+
+        assertEquals(expected, StringEscapeUtils.unescapeJson(input));
+    }
 }
diff --git a/src/test/java/org/apache/commons/lang3/StringUtilsTest.java b/src/test/java/org/apache/commons/lang3/StringUtilsTest.java
index 1da6b8deb..af84f4023 100644
--- a/src/test/java/org/apache/commons/lang3/StringUtilsTest.java
+++ b/src/test/java/org/apache/commons/lang3/StringUtilsTest.java
@@ -220,6 +220,7 @@ public void testSwapCase_String() {
         final String test = "This String contains a TitleCase character: \u01C8";
         final String expect = "tHIS sTRING CONTAINS A tITLEcASE CHARACTER: \u01C9";
         assertEquals(expect, WordUtils.swapCase(test));
+        assertEquals(expect, StringUtils.swapCase(test));
     }
 
     //-----------------------------------------------------------------------
@@ -255,6 +256,7 @@ public void testJoin_ArrayCharSeparator() {
         assertEquals(";;foo", StringUtils.join(MIXED_ARRAY_LIST, SEPARATOR_CHAR));
         assertEquals("foo;2", StringUtils.join(MIXED_TYPE_LIST, SEPARATOR_CHAR));
 
+        assertNull(StringUtils.join((Object[]) null, ',', 0, 1));
         assertEquals("/", StringUtils.join(MIXED_ARRAY_LIST, '/', 0, MIXED_ARRAY_LIST.length - 1));
         assertEquals("foo", StringUtils.join(MIXED_TYPE_LIST, '/', 0, 1));
         assertEquals("null", StringUtils.join(NULL_TO_STRING_LIST, '/', 0, 1));
@@ -611,6 +613,43 @@ public void testSplitByWholeString_StringStringBooleanInt() {
         }
     }
 
+    @Test
+    public void testSplitByWholeSeparatorPreserveAllTokens_StringString() {
+        assertArrayEquals(null, StringUtils.splitByWholeSeparatorPreserveAllTokens(null, "."));
+
+        assertEquals(0, StringUtils.splitByWholeSeparatorPreserveAllTokens("", ".").length);
+
+        // test whitespace
+        String input = "ab   de fg";
+        String[] expected = new String[]{"ab", "", "", "de", "fg"};
+
+        String[] actual = StringUtils.splitByWholeSeparatorPreserveAllTokens(input, null);
+        assertEquals(expected.length, actual.length);
+        for (int i = 0; i < actual.length; i += 1) {
+            assertEquals(expected[i], actual[i]);
+        }
+
+        // test delimiter singlechar
+        input = "1::2:::3::::4";
+        expected = new String[]{"1", "", "2", "", "", "3", "", "", "", "4"};
+
+        actual = StringUtils.splitByWholeSeparatorPreserveAllTokens(input, ":");
+        assertEquals(expected.length, actual.length);
+        for (int i = 0; i < actual.length; i += 1) {
+            assertEquals(expected[i], actual[i]);
+        }
+
+        // test delimiter multichar
+        input = "1::2:::3::::4";
+        expected = new String[]{"1", "2", ":3", "", "4"};
+
+        actual = StringUtils.splitByWholeSeparatorPreserveAllTokens(input, "::");
+        assertEquals(expected.length, actual.length);
+        for (int i = 0; i < actual.length; i += 1) {
+            assertEquals(expected[i], actual[i]);
+        }
+    }
+
     @Test
     public void testSplitByWholeSeparatorPreserveAllTokens_StringStringInt() {
         assertArrayEquals(null, StringUtils.splitByWholeSeparatorPreserveAllTokens(null, ".", -1));