https://jira.baeldung.com/browse/BAEL-5871 added sample code used in article (#12986)

core-java-modules/core-java-lang-5/src/test/java/com/baeldung/convertinttochar/ConvertCharToIntUnitTest.java

@@ -0,0 +1,47 @@
+package com.baeldung.convertinttochar;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class ConvertCharToIntUnitTest {
+
+    @Test
+    public void givenAChar_whenUsingGetNumericValue_thenExpectedNumericType() {
+        //char value
+        char c = '7';
+        // using getNumericValue
+        int n = Character.getNumericValue(c);
+
+        assertEquals(7, n);
+    }
+
+    @Test
+    public void givenAChar_whenSubtracting0_thenExpectedNumericType() {
+        //char value
+        char c = '7';
+        // subtract '0' from the char
+        int n = c - '0';
+
+        assertEquals(7, n);
+    }
+
+    @Test
+    public void givenAChar_whenUsingParseInt_thenExpectedNumericType() {
+        //char value
+        char c = '7';
+        // using parseInt
+        int n = Integer.parseInt(String.valueOf(c));
+
+        assertEquals(7, n);
+    }
+
+    @Test
+    public void givenAChar_whenCastingFromCharToInt_thenExpectedUnicodeRepresentation() {
+        //char value
+        char c = '7';
+        //cast to int
+        assertEquals(55, (int) c);
+    }
+
+}

core-java-modules/core-java-lang-5/src/test/java/com/baeldung/convertinttochar/ConvertIntToCharUnitTest.java

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+package com.baeldung.convertinttochar;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class ConvertIntToCharUnitTest {
+
+    @Test
+    public void givenAnInt_whenAdding0_thenExpectedCharType() {
+        int num = 7;
+        //add '0' to convert int to char
+        char c = (char) ('0' + num);
+
+        assertEquals('7', c);
+    }
+
+    @Test
+    public void givenAnInt_whenUsingForDigit_thenExpectedCharType() {
+        int num = 7;
+        // Convert using forDigit() method
+        char c = Character.forDigit(num, 10);
+
+        assertEquals('7', c);
+    }
+
+    @Test
+    public void givenAnInt_whenUsingToString_thenExpectedCharType() {
+        int num = 7;
+        //convert int to char using toString()
+        char c = Integer.toString(num)
+          .charAt(0);
+
+        assertEquals('7', c);
+    }
+}