BAEL-3928 Comparing Long values in Java

core-java-modules/core-java-lang-2/src/test/java/com/baeldung/comparelong/CompareLongUnitTest.java

@@ -0,0 +1,53 @@
+package com.baeldung.comparelong;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import org.junit.Test;
+
+public class CompareLongUnitTest {
+
+    @Test
+    public void givenLongValuesLessThan128_whenUsingReferenceComparater_thenSuccess() {
+
+        Long l1 = 127L;
+        Long l2 = 127L;
+
+        assertThat(l1 == l2).isTrue();
+    }
+
+    @Test
+    public void givenLongValuesGreaterOrEqualsThan128_whenUsingReferenceComparater_thenFails() {
+
+        Long l1 = 128L;
+        Long l2 = 128L;
+
+        assertThat(l1 == l2).isFalse();
+    }
+
+    @Test
+    public void givenLongValuesGreaterOrEqualsThan128_whenUsingEquals_thenSuccess() {
+
+        Long l1 = 128L;
+        Long l2 = 128L;
+
+        assertThat(l1.equals(l2)).isTrue();
+    }
+
+    @Test
+    public void givenLongValuesGreaterOrEqualsThan128_whenUsingComparisonOperator_andLongValue_thenSuccess() {
+
+        Long l1 = 128L;
+        Long l2 = 128L;
+
+        assertThat(l1.longValue() == l2.longValue()).isTrue();
+    }
+
+    @Test
+    public void givenLongValuesGreaterOrEqualsThan128_whenUsingCasting_thenSuccess() {
+
+        Long l1 = 128L;
+        Long l2 = 128L;
+
+        assertThat((long) l1 == (long) l2).isTrue();
+    }
+
+}