@@ -0,0 +1,317 @@
+package org.apache.commons.lang3.builder;%0A%0Aimport org.junit.Test;%0A%0Apublic class ReflectionToStringBuilderTest %7B%0A%0A    @Test(expected=IllegalArgumentException.class)%0A    public void testConstructorWithNullObject() %7B%0A        new ReflectionToStringBuilder(null, ToStringStyle.DEFAULT_STYLE, new StringBuffer());%0A    %7D%0A%0A%7D%0A

add testConstructorWithNullObject case in ReflectionToStringBuilderTest.java