From 521d57d2ef7d9b05d527167fc18bd7fa38399ddb Mon Sep 17 00:00:00 2001
From: Johnny Lim <izeye@naver.com>
Date: Fri, 10 Jan 2025 09:24:43 +0900
Subject: [PATCH] Add a test verifying that a single character meter name is
 allowed for Prometheus (#5791)

---
 .../prometheusmetrics/PrometheusMeterRegistryTest.java      | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/implementations/micrometer-registry-prometheus/src/test/java/io/micrometer/prometheusmetrics/PrometheusMeterRegistryTest.java b/implementations/micrometer-registry-prometheus/src/test/java/io/micrometer/prometheusmetrics/PrometheusMeterRegistryTest.java
index ebb6bd26cf..860712e4f3 100644
--- a/implementations/micrometer-registry-prometheus/src/test/java/io/micrometer/prometheusmetrics/PrometheusMeterRegistryTest.java
+++ b/implementations/micrometer-registry-prometheus/src/test/java/io/micrometer/prometheusmetrics/PrometheusMeterRegistryTest.java
@@ -1016,6 +1016,12 @@ void doesNotCallConventionOnScrape() {
         assertThat(convention.tagKeyCount.get()).isEqualTo(expectedTagKeyCount);
     }
 
+    @Test
+    void scrapeWhenMeterNameContainsSingleCharacter() {
+        registry.counter("c").increment();
+        assertThatNoException().isThrownBy(() -> registry.scrape());
+    }
+
     private static class CountingPrometheusNamingConvention extends PrometheusNamingConvention {
 
         AtomicInteger nameCount = new AtomicInteger();