diff --git a/core-java-modules/core-java-lang-6/src/test/java/com/baeldung/staticnonstatic/StaticReferenceNonStaticMethodUnitTest.java b/core-java-modules/core-java-lang-6/src/test/java/com/baeldung/staticnonstatic/StaticReferenceNonStaticMethodUnitTest.java
new file mode 100644
index 0000000000..11b8a5b87b
--- /dev/null
+++ b/core-java-modules/core-java-lang-6/src/test/java/com/baeldung/staticnonstatic/StaticReferenceNonStaticMethodUnitTest.java
@@ -0,0 +1,60 @@
+package com.baeldung.staticnonstatic;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+class ToolBox {
+
+    private String concat(String str1, String str2) {
+        return str1 + str2;
+    }
+
+    private static String concatStatic(String str1, String str2) {
+        return str1 + str2;
+    }
+
+    static String joinTwoStrings(String str1, String str2) {
+        // return concat(str1, str2); //<-- compilation error
+        return concatStatic(str1, str2);
+    }
+
+    static String creatingInstanceJoinTwoStrings(String str1, String str2) {
+        ToolBox toolBox = new ToolBox();
+        return toolBox.concat(str1, str2);
+    }
+
+    String instanceJoinTwoStrings(String str1, String str2) {
+        return concat(str1, str2);
+    }
+
+    String instanceCallStaticJoinTwoStrings(String str1, String str2) {
+        return concatStatic(str1, str2);
+    }
+}
+
+public class StaticReferenceNonStaticMethodUnitTest {
+
+    @Test
+    void whenCallingStaticMethodFromStaticContext_thenGetExpectedResult() {
+        assertEquals("ab", ToolBox.joinTwoStrings("a", "b"));
+    }
+
+    @Test
+    void whenCallingInstanceMethodByCreatingAnInstance_thenGetExpectedResult() {
+        assertEquals("ab", ToolBox.creatingInstanceJoinTwoStrings("a", "b"));
+    }
+
+    @Test
+    void whenCallingInstanceMethodFromAnInstance_thenGetExpectedResult() {
+        ToolBox toolBox = new ToolBox();
+        assertEquals("ab", toolBox.instanceJoinTwoStrings("a", "b"));
+    }
+
+    @Test
+    void whenCallingStaticMethodFromAnInstance_thenGetExpectedResult() {
+        ToolBox toolBox = new ToolBox();
+        assertEquals("ab", toolBox.instanceCallStaticJoinTwoStrings("a", "b"));
+    }
+
+}
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