GH-1190: Add view vector null boundary coverage

Author: goutamadwant

vector/src/test/java/org/apache/arrow/vector/TestVariableWidthViewVector.java

@@ -560,6 +560,40 @@ public void testSetSafeEmptyValueAtViewBufferBoundary(
     }
   }
 
+  @ParameterizedTest
+  @MethodSource({"vectorCreatorProvider"})
+  public void testSetValueCountFillsEmptiesAtViewBufferBoundary(
+      Function<BufferAllocator, BaseVariableWidthViewVector> vectorCreator) {
+    try (final BaseVariableWidthViewVector vector = vectorCreator.apply(allocator)) {
+      vector.allocateNew();
+      final int valueCapacity = vector.getValueCapacity();
+
+      vector.setSafe(valueCapacity - 1, "x".getBytes(StandardCharsets.UTF_8));
+      vector.setValueCount(valueCapacity + 1);
+
+      assertTrue(vector.getValueCapacity() > valueCapacity);
+      assertTrue(vector.isNull(valueCapacity));
+    }
+  }
+
+  @ParameterizedTest
+  @MethodSource({"vectorCreatorProvider"})
+  public void testSetNullAtViewBufferBoundary(
+      Function<BufferAllocator, BaseVariableWidthViewVector> vectorCreator) {
+    try (final BaseVariableWidthViewVector vector = vectorCreator.apply(allocator)) {
+      vector.allocateNew();
+      final int valueCapacity = vector.getValueCapacity();
+
+      for (int i = 0; i <= valueCapacity; i++) {
+        vector.setNull(i);
+      }
+      vector.setValueCount(valueCapacity + 1);
+
+      assertTrue(vector.getValueCapacity() > valueCapacity);
+      assertTrue(vector.isNull(valueCapacity));
+    }
+  }
+
   @Test
   public void testNullableVarType1() {