[BAEL-8232] - Moved java string related code and github links into new module java-strings

java-strings/src/test/java/com/baeldung/string/StringToCharStreamUnitTest.java

@@ -0,0 +1,59 @@
+package com.baeldung.string;
+
+import org.junit.Test;
+
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+import static org.hamcrest.CoreMatchers.instanceOf;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertThat;
+
+public class StringToCharStreamUnitTest {
+
+    private String testString = "Tests";
+
+    @Test
+    public void givenTestString_whenChars_thenReturnIntStream() {
+        assertThat(testString.chars(), instanceOf(IntStream.class));
+    }
+
+    @Test
+    public void givenTestString_whenCodePoints_thenReturnIntStream() {
+        assertThat(testString.codePoints(), instanceOf(IntStream.class));
+    }
+
+    @Test
+    public void givenTestString_whenCodePoints_thenShowOccurences() throws Exception {
+        Map<Character, Integer> map = testString.codePoints()
+          .mapToObj(c -> (char) c)
+          .filter(Character::isLetter)
+          .collect(Collectors.toMap(c -> c, c -> 1, Integer::sum));
+
+        System.out.println(map);
+    }
+
+    @Test
+    public void givenIntStream_whenMapToObj_thenReturnCharacterStream() {
+        Stream<Character> characterStream = testString.chars()
+          .mapToObj(c -> (char) c);
+        Stream<Character> characterStream1 = testString.codePoints()
+          .mapToObj(c -> (char) c);
+        assertNotNull("IntStream returned by chars() did not map to Stream<Character>", characterStream);
+        assertNotNull("IntStream returned by codePoints() did not map to Stream<Character>", characterStream1);
+    }
+
+    @Test
+    public void givenIntStream_whenMapToObj_thenReturnStringStream() {
+        List<String> strings = testString.codePoints()
+          .mapToObj(c -> String.valueOf((char) c))
+          .collect(Collectors.toList());
+
+        assertEquals(strings.size(), 5);
+    }
+
+}