Added extra edge cases

Author: tarunjgupta

src/test/java/com/thealgorithms/slidingwindow/CountNiceSubarraysTest.java

@@ -28,4 +28,29 @@ void testMultipleChoices() {
         int[] nums = {2, 2, 1, 2, 2, 1, 2};
         assertEquals(6, CountNiceSubarrays.countNiceSubarrays(nums, 2));
     }
+
+    @Test
+    void testTrailingEvenNumbers() {
+    int[] nums = {1, 2, 2, 2};
+    assertEquals(4, CountNiceSubarrays.countNiceSubarrays(nums, 1));
+    }
+
+    @Test
+    void testMultipleWindowShrinks() {
+    int[] nums = {1, 1, 1, 1};
+    assertEquals(3, CountNiceSubarrays.countNiceSubarrays(nums, 2));
+    }
+
+    @Test
+    void testEvensBetweenOdds() {
+    int[] nums = {2, 1, 2, 1, 2};
+    assertEquals(4, CountNiceSubarrays.countNiceSubarrays(nums, 2));
+    }
+
+    @Test
+    void testShrinkWithTrailingEvens() {
+        int[] nums = {2, 2, 1, 2, 2, 1, 2, 2};
+        assertEquals(9, CountNiceSubarrays.countNiceSubarrays(nums, 2));
+    }
+    
 }