diff --git a/clickhouse-client/src/test/java/com/clickhouse/client/config/ClickHouseConfigOptionTest.java b/clickhouse-client/src/test/java/com/clickhouse/client/config/ClickHouseConfigOptionTest.java
index e93f30889..c6e0fe8bc 100644
--- a/clickhouse-client/src/test/java/com/clickhouse/client/config/ClickHouseConfigOptionTest.java
+++ b/clickhouse-client/src/test/java/com/clickhouse/client/config/ClickHouseConfigOptionTest.java
@@ -8,110 +8,110 @@
 import com.clickhouse.client.ClickHouseFormat;
 
 public class ClickHouseConfigOptionTest {
-        static enum ClickHouseTestOption implements ClickHouseOption {
-                STR("string_option", "string", "string option"),
-                STR0("string_option0", "string0", "string option without environment variable support"),
-                STR1("string_option0", "string1",
-                                "string option without environment variable and system property support"),
-                INT("integer_option", 2333, "integer option"),
-                INT0("integer_option0", 23330, "integer option without environment variable support"),
-                INT1("integer_option1", 23331,
-                                "integer option without environment variable and system property support"),
-                BOOL("boolean_option", false, "boolean option"),
-                BOOL0("boolean_option0", true, "boolean option without environment variable support"),
-                BOOL1("boolean_option1", false,
-                                "boolean option without environment variable and system property support");
-
-                private final String key;
-                private final Serializable defaultValue;
-                private final Class<? extends Serializable> clazz;
-                private final String description;
-
-                <T extends Serializable> ClickHouseTestOption(String key, T defaultValue, String description) {
-                        this.key = ClickHouseChecker.nonNull(key, "key");
-                        this.defaultValue = defaultValue;
-                        this.clazz = defaultValue.getClass();
-                        this.description = ClickHouseChecker.nonNull(description, "description");
-                }
-
-                @Override
-                public String getKey() {
-                        return key;
-                }
-
-                @Override
-                public Serializable getDefaultValue() {
-                        return defaultValue;
-                }
-
-                @Override
-                public Class<? extends Serializable> getValueType() {
-                        return clazz;
-                }
-
-                @Override
-                public String getDescription() {
-                        return description;
-                }
+    static enum ClickHouseTestOption implements ClickHouseOption {
+        STR("string_option", "string", "string option"),
+        STR0("string_option0", "string0", "string option without environment variable support"),
+        STR1("string_option0", "string1",
+                "string option without environment variable and system property support"),
+        INT("integer_option", 2333, "integer option"),
+        INT0("integer_option0", 23330, "integer option without environment variable support"),
+        INT1("integer_option1", 23331,
+                "integer option without environment variable and system property support"),
+        BOOL("boolean_option", false, "boolean option"),
+        BOOL0("boolean_option0", true, "boolean option without environment variable support"),
+        BOOL1("boolean_option1", false,
+                "boolean option without environment variable and system property support");
+
+        private final String key;
+        private final Serializable defaultValue;
+        private final Class<? extends Serializable> clazz;
+        private final String description;
+
+        <T extends Serializable> ClickHouseTestOption(String key, T defaultValue, String description) {
+            this.key = ClickHouseChecker.nonNull(key, "key");
+            this.defaultValue = defaultValue;
+            this.clazz = defaultValue.getClass();
+            this.description = ClickHouseChecker.nonNull(description, "description");
         }
 
-        @Test(groups = { "unit" })
-        public void testFromString() {
-                Assert.assertThrows(IllegalArgumentException.class,
-                                () -> ClickHouseOption.fromString(null, String.class));
-                Assert.assertEquals(ClickHouseOption.fromString("", String.class), "");
-
-                Assert.assertEquals(ClickHouseOption.fromString("", Boolean.class), Boolean.FALSE);
-                Assert.assertEquals(ClickHouseOption.fromString("Yes", Boolean.class), Boolean.FALSE);
-                Assert.assertEquals(ClickHouseOption.fromString("1", Boolean.class), Boolean.TRUE);
-                Assert.assertEquals(ClickHouseOption.fromString("true", Boolean.class), Boolean.TRUE);
-                Assert.assertEquals(ClickHouseOption.fromString("True", Boolean.class), Boolean.TRUE);
-
-                Assert.assertEquals(ClickHouseOption.fromString("", Integer.class), Integer.valueOf(0));
-                Assert.assertEquals(ClickHouseOption.fromString("0", Integer.class), Integer.valueOf(0));
-                Assert.assertThrows(IllegalArgumentException.class,
-                                () -> ClickHouseOption.fromString(null, Integer.class));
-
-                Assert.assertEquals(ClickHouseOption.fromString("0.1", Float.class), Float.valueOf(0.1F));
-                Assert.assertEquals(ClickHouseOption.fromString("NaN", Float.class), Float.valueOf(Float.NaN));
-
-                Assert.assertEquals(ClickHouseOption.fromString("Map", ClickHouseDataType.class),
-                                ClickHouseDataType.Map);
-                Assert.assertEquals(ClickHouseOption.fromString("RowBinary", ClickHouseFormat.class),
-                                ClickHouseFormat.RowBinary);
-                Assert.assertThrows(IllegalArgumentException.class,
-                                () -> ClickHouseOption.fromString("NonExistFormat", ClickHouseFormat.class));
+        @Override
+        public String getKey() {
+            return key;
         }
 
-        @Test(groups = { "unit" })
-        public void testGetEffectiveDefaultValue() {
-                // environment variables are set in pom.xml
-                Assert.assertEquals(ClickHouseTestOption.STR.getEffectiveDefaultValue(),
-                                ClickHouseTestOption.STR.getDefaultValueFromEnvVar().get());
-                Assert.assertEquals(ClickHouseTestOption.INT.getEffectiveDefaultValue(),
-                                Integer.parseInt(ClickHouseTestOption.INT.getDefaultValueFromEnvVar().get()));
-                Assert.assertEquals(ClickHouseTestOption.BOOL.getEffectiveDefaultValue(),
-                                Boolean.valueOf(ClickHouseTestOption.BOOL.getDefaultValueFromEnvVar().get()));
-
-                String sv = "system.property";
-                int iv = 12345;
-                boolean bv = true;
-                System.setProperty(ClickHouseTestOption.STR0.getPrefix().toLowerCase() + "_"
-                                + ClickHouseTestOption.STR0.name().toLowerCase(), sv);
-                System.setProperty(ClickHouseTestOption.INT0.getPrefix().toLowerCase() + "_"
-                                + ClickHouseTestOption.INT0.name().toLowerCase(), String.valueOf(iv));
-                System.setProperty(ClickHouseTestOption.BOOL0.getPrefix().toLowerCase() + "_"
-                                + ClickHouseTestOption.BOOL0.name().toLowerCase(), String.valueOf(bv));
-
-                Assert.assertEquals(ClickHouseTestOption.STR0.getEffectiveDefaultValue(), sv);
-                Assert.assertEquals(ClickHouseTestOption.INT0.getEffectiveDefaultValue(), iv);
-                Assert.assertEquals(ClickHouseTestOption.BOOL0.getEffectiveDefaultValue(), bv);
-
-                Assert.assertEquals(ClickHouseTestOption.STR1.getEffectiveDefaultValue(),
-                                ClickHouseTestOption.STR1.getDefaultValue());
-                Assert.assertEquals(ClickHouseTestOption.INT1.getEffectiveDefaultValue(),
-                                ClickHouseTestOption.INT1.getDefaultValue());
-                Assert.assertEquals(ClickHouseTestOption.BOOL1.getEffectiveDefaultValue(),
-                                ClickHouseTestOption.BOOL1.getDefaultValue());
+        @Override
+        public Serializable getDefaultValue() {
+            return defaultValue;
         }
+
+        @Override
+        public Class<? extends Serializable> getValueType() {
+            return clazz;
+        }
+
+        @Override
+        public String getDescription() {
+            return description;
+        }
+    }
+
+    @Test(groups = { "unit" })
+    public void testFromString() {
+        Assert.assertThrows(IllegalArgumentException.class,
+                () -> ClickHouseOption.fromString(null, String.class));
+        Assert.assertEquals(ClickHouseOption.fromString("", String.class), "");
+
+        Assert.assertEquals(ClickHouseOption.fromString("", Boolean.class), Boolean.FALSE);
+        Assert.assertEquals(ClickHouseOption.fromString("Yes", Boolean.class), Boolean.FALSE);
+        Assert.assertEquals(ClickHouseOption.fromString("1", Boolean.class), Boolean.TRUE);
+        Assert.assertEquals(ClickHouseOption.fromString("true", Boolean.class), Boolean.TRUE);
+        Assert.assertEquals(ClickHouseOption.fromString("True", Boolean.class), Boolean.TRUE);
+
+        Assert.assertEquals(ClickHouseOption.fromString("", Integer.class), Integer.valueOf(0));
+        Assert.assertEquals(ClickHouseOption.fromString("0", Integer.class), Integer.valueOf(0));
+        Assert.assertThrows(IllegalArgumentException.class,
+                () -> ClickHouseOption.fromString(null, Integer.class));
+
+        Assert.assertEquals(ClickHouseOption.fromString("0.1", Float.class), Float.valueOf(0.1F));
+        Assert.assertEquals(ClickHouseOption.fromString("NaN", Float.class), Float.valueOf(Float.NaN));
+
+        Assert.assertEquals(ClickHouseOption.fromString("Map", ClickHouseDataType.class),
+                ClickHouseDataType.Map);
+        Assert.assertEquals(ClickHouseOption.fromString("RowBinary", ClickHouseFormat.class),
+                ClickHouseFormat.RowBinary);
+        Assert.assertThrows(IllegalArgumentException.class,
+                () -> ClickHouseOption.fromString("NonExistFormat", ClickHouseFormat.class));
+    }
+
+    @Test(groups = { "unit" })
+    public void testGetEffectiveDefaultValue() {
+        // environment variables are set in pom.xml
+        Assert.assertEquals(ClickHouseTestOption.STR.getEffectiveDefaultValue(),
+                ClickHouseTestOption.STR.getDefaultValueFromEnvVar().get());
+        Assert.assertEquals(ClickHouseTestOption.INT.getEffectiveDefaultValue(),
+                Integer.parseInt(ClickHouseTestOption.INT.getDefaultValueFromEnvVar().get()));
+        Assert.assertEquals(ClickHouseTestOption.BOOL.getEffectiveDefaultValue(),
+                Boolean.valueOf(ClickHouseTestOption.BOOL.getDefaultValueFromEnvVar().get()));
+
+        String sv = "system.property";
+        int iv = 12345;
+        boolean bv = true;
+        System.setProperty(ClickHouseTestOption.STR0.getPrefix().toLowerCase() + "_"
+                + ClickHouseTestOption.STR0.name().toLowerCase(), sv);
+        System.setProperty(ClickHouseTestOption.INT0.getPrefix().toLowerCase() + "_"
+                + ClickHouseTestOption.INT0.name().toLowerCase(), String.valueOf(iv));
+        System.setProperty(ClickHouseTestOption.BOOL0.getPrefix().toLowerCase() + "_"
+                + ClickHouseTestOption.BOOL0.name().toLowerCase(), String.valueOf(bv));
+
+        Assert.assertEquals(ClickHouseTestOption.STR0.getEffectiveDefaultValue(), sv);
+        Assert.assertEquals(ClickHouseTestOption.INT0.getEffectiveDefaultValue(), iv);
+        Assert.assertEquals(ClickHouseTestOption.BOOL0.getEffectiveDefaultValue(), bv);
+
+        Assert.assertEquals(ClickHouseTestOption.STR1.getEffectiveDefaultValue(),
+                ClickHouseTestOption.STR1.getDefaultValue());
+        Assert.assertEquals(ClickHouseTestOption.INT1.getEffectiveDefaultValue(),
+                ClickHouseTestOption.INT1.getDefaultValue());
+        Assert.assertEquals(ClickHouseTestOption.BOOL1.getEffectiveDefaultValue(),
+                ClickHouseTestOption.BOOL1.getDefaultValue());
+    }
 }