From dc202cb4b67e811dc7c21b98416dcd41a867bacc Mon Sep 17 00:00:00 2001
From: Bartosz Spyrko-Smietanko <bspyrkos@redhat.com>
Date: Fri, 14 May 2021 14:28:37 +0100
Subject: [PATCH] Verify that HELP lines are not duplicated

---
 .../metrics/test/MetricAppBean.java           | 10 +++++
 .../metrics/test/MpMetricTest.java            | 40 ++++++++++++++++++-
 2 files changed, 49 insertions(+), 1 deletion(-)

diff --git a/tck/rest/src/main/java/org/eclipse/microprofile/metrics/test/MetricAppBean.java b/tck/rest/src/main/java/org/eclipse/microprofile/metrics/test/MetricAppBean.java
index da7bd670..74319854 100644
--- a/tck/rest/src/main/java/org/eclipse/microprofile/metrics/test/MetricAppBean.java
+++ b/tck/rest/src/main/java/org/eclipse/microprofile/metrics/test/MetricAppBean.java
@@ -190,6 +190,16 @@ public long countMeB() {
         return 666666;
     }
 
+    @Counted(name = "counter.with.desc", tags={"number=one"}, description = "description")
+    public void counterWithDesc1() {
+
+    }
+
+    @Counted(name = "counter.with.desc", tags={"number=two"}, description = "description")
+    public void counterWithDesc2() {
+
+    }
+
     public void gaugeMe() {
 
         @SuppressWarnings("unchecked")
diff --git a/tck/rest/src/main/java/org/eclipse/microprofile/metrics/test/MpMetricTest.java b/tck/rest/src/main/java/org/eclipse/microprofile/metrics/test/MpMetricTest.java
index cc865107..665fab12 100644
--- a/tck/rest/src/main/java/org/eclipse/microprofile/metrics/test/MpMetricTest.java
+++ b/tck/rest/src/main/java/org/eclipse/microprofile/metrics/test/MpMetricTest.java
@@ -47,6 +47,7 @@
 import java.util.Map;
 import java.util.Set;
 import java.util.TreeMap;
+import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
 import javax.inject.Inject;
@@ -55,7 +56,9 @@
 import javax.xml.parsers.ParserConfigurationException;
 
 import org.eclipse.microprofile.metrics.MetricRegistry;
+import org.hamcrest.Description;
 import org.hamcrest.Matcher;
+import org.hamcrest.BaseMatcher;
 import org.jboss.arquillian.container.test.api.Deployment;
 import org.jboss.arquillian.container.test.api.RunAsClient;
 import org.jboss.arquillian.junit.Arquillian;
@@ -1274,7 +1277,42 @@ public void testApplicationSimpleTimerUnitOpenMetrics() {
         ;
     }
     
-    
+    @Test
+    @RunAsClient
+    public void testApplicationContainsHelpMessageOnce() {
+        given().header("Accept", TEXT_PLAIN).when().get("/metrics/application")
+            .then().statusCode(200)
+            .and()
+            .body(containsLineOnce("HELP application_org_eclipse_microprofile_metrics_test_MetricAppBean_counter_with_desc_total description"));
+    }
+
+    /**
+     * Checks that given line appears in the body only once.
+     *
+     * @param expected
+     * @return
+     */
+    private Matcher<String> containsLineOnce(String expected) {
+        return new BaseMatcher<String>() {
+            @Override
+            public void describeTo(Description description) {
+                description.appendText("Body should contain line [" + expected + "] only once.");
+            }
+
+            @Override
+            public boolean matches(Object o) {
+                String body = (String) o;
+                Pattern pattern = Pattern.compile(expected);
+                java.util.regex.Matcher matcher = pattern.matcher(body);
+                int count = 0;
+                while (matcher.find()) {
+                    count++;
+                }
+                return count == 1;
+            }
+        };
+    }
+
     /**
      * Checks that the value is within tolerance of the expected value
      *