diff --git a/analyzer/src/test/java/nl/basjes/parse/useragent/analyze/TestMatcherExpressions.java b/analyzer/src/test/java/nl/basjes/parse/useragent/analyze/TestMatcherExpressions.java
index 64422947d7..36b5af5ab3 100644
--- a/analyzer/src/test/java/nl/basjes/parse/useragent/analyze/TestMatcherExpressions.java
+++ b/analyzer/src/test/java/nl/basjes/parse/useragent/analyze/TestMatcherExpressions.java
@@ -63,4 +63,11 @@ public void runAllFieldsTests() {
         UserAgentAnalyzerTester uaa = new UserAgentAnalyzerTester("classpath*:AllFields-tests.yaml");
         Assert.assertTrue(uaa.runTests(false, true));
     }
+
+    @Test
+    public void runDebugOutputTest() {
+        UserAgentAnalyzerTester uaa = new UserAgentAnalyzerTester("classpath*:DebugOutput-tests.yaml");
+        Assert.assertTrue(uaa.runTests(false, true));
+    }
+
 }
diff --git a/analyzer/src/test/resources/DebugOutput-tests.yaml b/analyzer/src/test/resources/DebugOutput-tests.yaml
new file mode 100644
index 0000000000..764525949a
--- /dev/null
+++ b/analyzer/src/test/resources/DebugOutput-tests.yaml
@@ -0,0 +1,41 @@
+#
+# Yet Another UserAgent Analyzer
+# Copyright (C) 2013-2016 Niels Basjes
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an AS IS BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+config:
+- lookup:
+    name: 'Dummy'
+    map:
+      "Nothing": "to see here"
+
+- matcher:
+    options:
+    - 'verbose'
+    require:
+    - 'LookUp[Dummy;agent.(1)product.(1)name;"Fake"]'
+    - 'IsNull[agent.(1)product.(1)name^.name="Word"!="Other"^.name[1]@{"Start"}"End"@@[-1][2-3][3-]<><]'
+    - 'IsNull[agent.(1)product.(1)name^.name="Bla"]'
+    extract:
+    - 'WordMatchFlipFlop: 1:agent.(1)product.(1)comments.(1-3)entry.(1)text[-1]="One"@[3]="Three"@[2]'
+
+- test:
+    options:
+    - 'verbose'
+    input:
+      name: 'Validate Debug Output looks good'
+      user_agent_string: 'Word/1 ( One Two Three )'
+    expected:
+      WordMatchFlipFlop: 'Two'