This commit is related to BAEL-6825 (#15981)

* This commit is related to BAEL-6825

This commit aims to add a test class "IntegersBitLevelUnitTest.java".

* Update IntegersBitLevelUnitTest.java

* Update IntegersBitLevelUnitTest.java

* Update IntegersBitLevelUnitTest.java

* Update IntegersBitLevelUnitTest.java

core-java-modules/core-java-lang-operators-2/src/test/java/com/baeldung/integersatbitlevel/IntegersBitLevelUnitTest.java

@@ -0,0 +1,66 @@
+package com.baeldung.integersatbitlevel;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.Assert.assertEquals;
+
+class IntegersBitLevelUnitTest {
+
+    @Test
+    void givenNumbers_whenBitwiseAND_thenResultIsExpected() {
+        int result = 0b1100 & 0b0111;
+        assertEquals(0b0100, result);
+    }
+
+    @Test
+    void givenNumbers_whenBitwiseOR_thenResultIsExpected() {
+        int result = 0b1100 | 0b0111;
+        assertEquals(0b1111, result);
+    }
+
+    @Test
+    void givenNumbers_whenBitwiseXOR_thenResultIsExpected() {
+        int result = 0b1100 ^ 0b0111;
+        assertEquals(0b1011, result);
+    }
+
+    @Test
+    void givenNumber_whenBitwiseNOT_thenResultIsExpected() {
+        int result = ~0b0101;
+        assertEquals(-0b0110, result);
+    }
+
+    @Test
+    void givenNumber_whenBitwiseLeftShift_thenResultIsExpected() {
+        int result = 0b0101 << 2;
+        assertEquals(0b10100, result);
+    }
+
+    @Test
+    void givenNumber_whenBitwiseRightShift_thenResultIsExpected() {
+        int result = 0b0101 >> 1;
+        assertEquals(0b10, result);
+    }
+
+    @Test
+    void givenOriginalColor_whenApplyingMask_thenObtainModifiedColor() {
+        int originalColor = 0xFF336699;
+
+        int alphaMask = 0xFF000000;
+        int redMask = 0x00FF0000;
+        int greenMask = 0x0000FF00;
+        int blueMask = 0x000000FF;
+
+        int alpha = (originalColor & alphaMask) >>> 24;
+        int red = (originalColor & redMask) >>> 16;
+        int green = (originalColor & greenMask) >>> 8;
+        int blue = originalColor & blueMask;
+
+        red = Math.min(255, red + 50);
+        green = Math.min(255, green + 30);
+
+        int modifiedColor = (alpha << 24) | (red << 16) | (green << 8) | blue;
+
+        assertEquals(-10124135, modifiedColor);
+    }
+}