Added code examples for BAEL-4300 article.

core-java-modules/core-java-lang-3/src/test/java/com/baeldung/stringtoboolean/StringToBooleanUnitTest.java

@@ -0,0 +1,29 @@
+package com.baeldung.stringtoboolean;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+
+public class StringToBooleanUnitTest
+{
+    @Test
+    public void givenStringTrue_whenUsingParseBoolean_thenTrue() {
+        assertThat(Boolean.parseBoolean("true")).isTrue();
+    }
+
+    @Test
+    public void givenStringTrue_whenUsingValueOf_thenTrue() {
+        assertThat(Boolean.valueOf("true")).isTrue();
+    }
+
+    @Test
+    public void givenStringTrue_whenUsingGetBoolean_thenFalse() {
+        assertThat(Boolean.getBoolean("true")).isFalse();
+    }
+
+    @Test
+    public void givenSystemProperty_whenUsingGetBoolean_thenTrue() {
+        System.setProperty("CODING_IS_FUN", "true");
+        assertThat(Boolean.getBoolean("CODING_IS_FUN")).isTrue();
+    }
+}