From 6ae5efd7c31e5dd9627eedc3ab93b809bfd90917 Mon Sep 17 00:00:00 2001
From: Johnny Lim <izeye@naver.com>
Date: Mon, 11 Mar 2019 20:25:40 +0900
Subject: [PATCH] Add a test for multiple registrations of the same name of
 gauge (#1266)

See gh-1176
---
 .../core/instrument/MeterRegistryTest.java       | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/micrometer-core/src/test/java/io/micrometer/core/instrument/MeterRegistryTest.java b/micrometer-core/src/test/java/io/micrometer/core/instrument/MeterRegistryTest.java
index 30a0b4ecb1..22d662f385 100644
--- a/micrometer-core/src/test/java/io/micrometer/core/instrument/MeterRegistryTest.java
+++ b/micrometer-core/src/test/java/io/micrometer/core/instrument/MeterRegistryTest.java
@@ -28,6 +28,12 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+/**
+ * Tests for {@link MeterRegistry}.
+ *
+ * @author Jon Schneider
+ * @author Johnny Lim
+ */
 class MeterRegistryTest {
     private MeterRegistry registry = new SimpleMeterRegistry();
 
@@ -45,7 +51,7 @@ public MeterFilterReply accept(Meter.Id id) {
     }
 
     @Test
-    void overidingAcceptMeterFilter() {
+    void overridingAcceptMeterFilter() {
         registry.config().meterFilter(MeterFilter.accept(m -> m.getName().startsWith("jvm.important")));
         registry.config().meterFilter(MeterFilter.deny(m -> m.getName().startsWith("jvm")));
 	
@@ -97,4 +103,12 @@ void noopMetersAfterRegistryClosed() {
         assertThat(registry.timer("my.timer.before")).isNotInstanceOf(NoopTimer.class);
         assertThat(registry.timer("my.timer.after")).isInstanceOf(NoopTimer.class);
     }
+
+    @Test
+    void gaugeRegistersGaugeOnceAndSubsequentGaugeCallsWillNotRegister() {
+        registry.gauge("my.gauge", 1d);
+        registry.gauge("my.gauge", 2d);
+
+        assertThat(registry.get("my.gauge").gauge().value()).isEqualTo(1d);
+    }
 }