diff --git a/core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/SwitchExpressionsWithYieldUnitTest.java b/core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/SwitchExpressionsWithYieldUnitTest.java
new file mode 100644
index 0000000000..be1fcfd167
--- /dev/null
+++ b/core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/SwitchExpressionsWithYieldUnitTest.java
@@ -0,0 +1,27 @@
+package com.baeldung.newfeatures;
+
+import static org.junit.Assert.assertEquals;
+
+import org.junit.Test;
+
+public class SwitchExpressionsWithYieldUnitTest {
+
+    @Test
+    @SuppressWarnings("preview")
+    public void whenSwitchingOnOperationSquareMe_thenWillReturnSquare() {
+        var me = 4;
+        var operation = "squareMe";
+        var result = switch (operation) {
+        case "doubleMe" -> {
+            yield me * 2;
+        }
+        case "squareMe" -> {
+            yield me * me;
+        }
+        default -> me;
+        };
+
+        assertEquals(16, result);
+    }
+
+}
diff --git a/core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/TextBlocksUnitTest.java b/core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/TextBlocksUnitTest.java
new file mode 100644
index 0000000000..1f8ddcbfb4
--- /dev/null
+++ b/core-java-modules/core-java-13/src/test/java/com/baeldung/newfeatures/TextBlocksUnitTest.java
@@ -0,0 +1,39 @@
+package com.baeldung.newfeatures;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+
+public class TextBlocksUnitTest {
+
+    private static final String JSON_STRING = "{\r\n" + "\"name\" : \"Baeldung\",\r\n" + "\"website\" : \"https://www.%s.com/\"\r\n" + "}";
+
+    @SuppressWarnings("preview")
+    private static final String TEXT_BLOCK_JSON = """
+            {
+            "name" : "Baeldung",
+            "website" : "https://www.%s.com/"
+            }
+        """;
+
+    @Test
+    public void whenTextBlocks_thenStringOperationsWork() {
+
+        assertThat(TEXT_BLOCK_JSON.contains("Baeldung")).isTrue();
+        assertThat(TEXT_BLOCK_JSON.indexOf("www")).isGreaterThan(0);
+        assertThat(TEXT_BLOCK_JSON.length()).isGreaterThan(0);
+
+    }
+
+    @SuppressWarnings("removal")
+    @Test
+    public void whenTextBlocks_thenFormattedWorksAsFormat() {
+        assertThat(TEXT_BLOCK_JSON.formatted("baeldung")
+            .contains("www.baeldung.com")).isTrue();
+
+        assertThat(String.format(JSON_STRING, "baeldung")
+            .contains("www.baeldung.com")).isTrue();
+
+    }
+   
+}