From 2f5a6c085d084c73c11017babb0de90c59044767 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 3 Jul 2026 14:48:27 +0100
Subject: Add upperCamelCaseToLowerCamelCase()

---
 .../java/org/zwobble/hobgoblin/compiler/util/Casing.java  |  4 ++++
 .../org/zwobble/hobgoblin/compiler/util/CasingTests.java  | 15 +++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/util/Casing.java b/src/main/java/org/zwobble/hobgoblin/compiler/util/Casing.java
index e99aec6..3705f99 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/util/Casing.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/util/Casing.java
@@ -9,6 +9,10 @@ public class Casing {
         return name.substring(0, 1).toUpperCase(Locale.ROOT) + name.substring(1);
     }
 
+    public static String upperCamelCaseToLowerCamelCase(String name) {
+        return name.substring(0, 1).toLowerCase(Locale.ROOT) + name.substring(1);
+    }
+
     public static String lowerCamelCaseToUpperCase(String lowerCamelCase) {
         var upperCase = new StringBuilder();
 
diff --git a/src/test/java/org/zwobble/hobgoblin/compiler/util/CasingTests.java b/src/test/java/org/zwobble/hobgoblin/compiler/util/CasingTests.java
index 561ec8a..5893335 100644
--- a/src/test/java/org/zwobble/hobgoblin/compiler/util/CasingTests.java
+++ b/src/test/java/org/zwobble/hobgoblin/compiler/util/CasingTests.java
@@ -1,5 +1,6 @@
 package org.zwobble.hobgoblin.compiler.util;
 
+import org.junit.jupiter.api.Test;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.CsvSource;
 
@@ -7,6 +8,20 @@ import static org.zwobble.precisely.AssertThat.assertThat;
 import static org.zwobble.precisely.Matchers.equalTo;
 
 public class CasingTests {
+    @Test
+    public void lowerCamelCaseToUpperCamelCase() {
+        var result = Casing.lowerCamelCaseToUpperCamelCase("abcDef");
+
+        assertThat(result, equalTo("AbcDef"));
+    }
+
+    @Test
+    public void upperCamelCaseToLowerCamelCase() {
+        var result = Casing.upperCamelCaseToLowerCamelCase("AbcDef");
+
+        assertThat(result, equalTo("abcDef"));
+    }
+
     @ParameterizedTest
     @CsvSource({
         "a,A",
-- 
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