diff --git a/4Week_Mission/mutbooks/src/test/java/com/example/mutbooks/util/UtTest.java b/4Week_Mission/mutbooks/src/test/java/com/example/mutbooks/util/UtTest.java
new file mode 100644
index 0000000..f35223f
--- /dev/null
+++ b/4Week_Mission/mutbooks/src/test/java/com/example/mutbooks/util/UtTest.java
@@ -0,0 +1,21 @@
+package com.example.mutbooks.util;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.Map;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class UtTest {
+    @Test
+    @DisplayName("Ut.mapOf() 인자값을 map 으로 변환")
+     void t1() {
+        Map<String, Integer> ages = Ut.mapOf("영수", 22, "철수", 33, "영희", 44, "민수", 55);
+
+        assertThat(ages.get("영수")).isEqualTo(22);
+        assertThat(ages.get("철수")).isEqualTo(33);
+        assertThat(ages.get("영희")).isEqualTo(44);
+        assertThat(ages.get("민수")).isEqualTo(55);
+    }
+}
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