diff --git a/core-java/src/main/java/com/baeldung/string/CodePointAtTest.java b/core-java/src/main/java/com/baeldung/string/CodePointAtTest.java
deleted file mode 100644
index bce0e1af18..0000000000
--- a/core-java/src/main/java/com/baeldung/string/CodePointAtTest.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package com.baeldung.string;
-
-import static org.junit.Assert.assertEquals;
-import org.junit.Test;
-
-public class CodePointAtTest {
-
-    @Test
-    public void whenCallCodePointAt_thenDecimalUnicodeReturned() {
-        assertEquals(97, "abcd".codePointAt(0));
-    }
-}
diff --git a/core-java/src/main/java/com/baeldung/string/ConcatTest.java b/core-java/src/main/java/com/baeldung/string/ConcatTest.java
deleted file mode 100644
index 4a7362b513..0000000000
--- a/core-java/src/main/java/com/baeldung/string/ConcatTest.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package com.baeldung.string;
-
-import static org.junit.Assert.assertEquals;
-import org.junit.Test;
-
-public class ConcatTest {
-    
-    @Test
-    public void whenCallConcat_thenCorrect() {
-        assertEquals("elephant", "elep".concat("hant"));
-    }
-}
diff --git a/core-java/src/main/java/com/baeldung/string/GetBytesTest.java b/core-java/src/main/java/com/baeldung/string/GetBytesTest.java
deleted file mode 100644
index 22011678f0..0000000000
--- a/core-java/src/main/java/com/baeldung/string/GetBytesTest.java
+++ /dev/null
@@ -1,14 +0,0 @@
-package com.baeldung.string;
-
-import static org.junit.Assert.assertArrayEquals;
-import org.junit.Test;
-
-public class GetBytesTest {
-
-    @Test
-    public void whenGetBytes_thenCorrect() {
-        byte[] byteArray = "abcd".getBytes();
-        byte[] expected = new byte[] { 97, 98, 99, 100 };
-        assertArrayEquals(expected, byteArray);
-    }
-}