Remove use of redundant String.substring() parameter.
diff --git a/src/test/java/org/apache/commons/exec/environment/EnvironmentUtilsTest.java b/src/test/java/org/apache/commons/exec/environment/EnvironmentUtilsTest.java
index b2e456b..f666bf5 100644
--- a/src/test/java/org/apache/commons/exec/environment/EnvironmentUtilsTest.java
+++ b/src/test/java/org/apache/commons/exec/environment/EnvironmentUtilsTest.java
@@ -18,7 +18,6 @@
 
 package org.apache.commons.exec.environment;
 
-import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;