diff --git a/src/test/java/emissary/test/util/RegularExpressionTestUtil.java b/src/test/java/emissary/test/util/RegularExpressionTestUtil.java
index 3391c766a5..3dd41f3d99 100644
--- a/src/test/java/emissary/test/util/RegularExpressionTestUtil.java
+++ b/src/test/java/emissary/test/util/RegularExpressionTestUtil.java
@@ -1,11 +1,13 @@
 package emissary.test.util;
 
+import org.apache.commons.collections4.CollectionUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import javax.annotation.Nullable;
 
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
@@ -26,9 +28,9 @@ public class RegularExpressionTestUtil {
      * @param shouldMatch - Optional. The list of strings that should match the regular expression.
      * @param shouldNotMatch - Optional. The list of strings that should not match the regular expression.
      */
-    public static void testRegexPattern(String regexPatternString, List<String> shouldMatch, List<String> shouldNotMatch) {
+    public static void testRegexPattern(String regexPatternString, @Nullable List<String> shouldMatch, @Nullable List<String> shouldNotMatch) {
 
-        if (regexPatternString.isBlank()) {
+        if (regexPatternString == null || regexPatternString.isBlank()) {
             fail("The test lacks required parameters.");
         }
 
@@ -40,29 +42,34 @@ public static void testRegexPattern(String regexPatternString, List<String> shou
 
     /**
      * A method to test a list of values that should and should not match a particular regular expression. One of the two
-     * lists may be empty, but not both.
+     * lists may be empty or null, but not both.
      * 
      * @param patternUnderTest - Required. The pre-compiled pattern used to test against the provided values. Must not be
      *        null.
      * @param shouldMatch - Optional. The list of strings that should match the regular expression.
      * @param shouldNotMatch - Optional. The list of strings that should not match the regular expression.
      */
-    public static void testRegexPattern(Pattern patternUnderTest, List<String> shouldMatch, List<String> shouldNotMatch) {
+    public static void testRegexPattern(Pattern patternUnderTest, @Nullable List<String> shouldMatch, @Nullable List<String> shouldNotMatch) {
         int fineGrainTestCount = 0;
-        if (patternUnderTest == null || (shouldMatch.isEmpty() && shouldNotMatch.isEmpty())) {
+        if (patternUnderTest == null || (CollectionUtils.isEmpty(shouldMatch) && CollectionUtils.isEmpty(shouldNotMatch))) {
             fail("The test lacks required parameters.");
         }
-        for (String matchMe : shouldMatch) {
-            Matcher mm = patternUnderTest.matcher(matchMe);
-            assertTrue(mm.find(), String.format(" -- Pattern SHOULD match the regex [%s], but did not: %s", patternUnderTest.pattern(), matchMe));
-            fineGrainTestCount++;
+
+        if (!CollectionUtils.isEmpty(shouldMatch)) {
+            for (String matchMe : shouldMatch) {
+                Matcher mm = patternUnderTest.matcher(matchMe);
+                assertTrue(mm.find(), String.format(" -- Pattern SHOULD match the regex [%s], but did not: %s", patternUnderTest.pattern(), matchMe));
+                fineGrainTestCount++;
+            }
         }
 
-        for (String dontMatchMe : shouldNotMatch) {
-            Matcher dmm = patternUnderTest.matcher(dontMatchMe);
-            assertFalse(dmm.find(),
-                    String.format(" -- Pattern SHOULD NOT match the regex[%s], but did: %s", patternUnderTest.pattern(), dontMatchMe));
-            fineGrainTestCount++;
+        if (!CollectionUtils.isEmpty(shouldNotMatch)) {
+            for (String dontMatchMe : shouldNotMatch) {
+                Matcher dmm = patternUnderTest.matcher(dontMatchMe);
+                assertFalse(dmm.find(),
+                        String.format(" -- Pattern SHOULD NOT match the regex[%s], but did: %s", patternUnderTest.pattern(), dontMatchMe));
+                fineGrainTestCount++;
+            }
         }
         if (fineGrainTestCount == 0) {
             fail("Didn't test anything.");