refactored unit tests.

Author: ritiktrianz

athena-vertica/src/test/java/com/amazonaws/athena/connectors/vertica/VerticaMetadataHandlerTest.java

@@ -156,7 +156,6 @@ public void setUp() throws Exception
         Mockito.when(this.jdbcConnectionFactory.getConnection(nullable(CredentialsProvider.class))).thenReturn(this.connection);
         this.verticaMetadataHandler = new VerticaMetadataHandler(databaseConnectionConfig, this.jdbcConnectionFactory,
                 com.google.common.collect.ImmutableMap.of(), amazonS3, verticaSchemaUtils);
-        verticaMetadataHandlerMocked = Mockito.spy(this.verticaMetadataHandler);
         this.allocator = new BlockAllocatorImpl();
         this.databaseMetaData = this.connection.getMetaData();
         verticaMetadataHandlerMocked = Mockito.spy(this.verticaMetadataHandler);
@@ -310,7 +309,7 @@ public void getPartitions() throws Exception {
                 ImmutableList.of(Range.equal(allocator, new ArrowType.FloatingPoint(org.apache.arrow.vector.types.FloatingPointPrecision.DOUBLE), 3.14159)), false));
         constraintsMap.put("decimal_col", SortedRangeSet.copyOf(new ArrowType.Decimal(10, 2, 128),
                 ImmutableList.of(Range.equal(allocator, new ArrowType.Decimal(10, 2, 128), new BigDecimal("123.45"))), false));
-        constraintsMap.put("varchar_col", SortedRangeSet.copyOf(new ArrowType.Utf8(), // No changes needed
+        constraintsMap.put("varchar_col", SortedRangeSet.copyOf(new ArrowType.Utf8(),
                 ImmutableList.of(Range.equal(allocator, new ArrowType.Utf8(), "test")), false));
 
         String[] schema = {"TABLE_SCHEM", "TABLE_NAME", "COLUMN_NAME", "TYPE_NAME"};