added to test class for string to char array char array to string conversion

core-java/src/test/java/com/baeldung/java/conversion/StringCharArrayConversionTest.java

@@ -0,0 +1,25 @@
+package com.baeldung.java.conversion;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+
+public class StringCharArrayConversionTest {
+
+    @Test
+    public void stringToCharArray() throws Exception {
+        String beforeConvCharArr = "Text";
+        char[] afterConvCharArr = {'T','e','x','t'};
+
+        assertArrayEquals(beforeConvCharArr.toCharArray(),afterConvCharArr);
+    }
+
+    @Test
+    public void charArrayToString() throws Exception {
+        char[] beforeConvStr = {'T','e','x','t'};
+        String afterConvStr = "Text";
+
+        assertEquals(String.valueOf(beforeConvStr),afterConvStr);
+    }
+}