diff --git a/common/functions/Cargo.toml b/common/functions/Cargo.toml
index 7e20b4b085d17..842682a31d3e2 100644
--- a/common/functions/Cargo.toml
+++ b/common/functions/Cargo.toml
@@ -6,6 +6,10 @@ license = "Apache-2.0"
 publish = false
 edition = "2021"
 
+[lib]
+doctest = false
+test = false
+
 [dependencies] # In alphabetical order
 # Workspace dependencies
 common-arrow = {path = "../arrow"}
diff --git a/common/functions/src/aggregates/mod.rs b/common/functions/src/aggregates/mod.rs
index 1d41a46682715..ba8eeea5b1f32 100644
--- a/common/functions/src/aggregates/mod.rs
+++ b/common/functions/src/aggregates/mod.rs
@@ -12,11 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(test)]
-mod aggregate_combinator_test;
-#[cfg(test)]
-mod aggregate_function_test;
-
 mod aggregate_arg_min_max;
 mod aggregate_avg;
 mod aggregate_combinator_distinct;
diff --git a/common/functions/src/scalars/arithmetics/mod.rs b/common/functions/src/scalars/arithmetics/mod.rs
index 4a3996c8c071a..414ea976d0de5 100644
--- a/common/functions/src/scalars/arithmetics/mod.rs
+++ b/common/functions/src/scalars/arithmetics/mod.rs
@@ -12,9 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(test)]
-mod arithmetic_test;
-
 mod arithmetic;
 mod arithmetic_div;
 mod arithmetic_minus;
diff --git a/common/functions/src/scalars/comparisons/mod.rs b/common/functions/src/scalars/comparisons/mod.rs
index 0f424484d4432..ef93b44493cb2 100644
--- a/common/functions/src/scalars/comparisons/mod.rs
+++ b/common/functions/src/scalars/comparisons/mod.rs
@@ -12,9 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(test)]
-mod comparison_test;
-
 mod comparison;
 mod comparison_eq;
 mod comparison_gt;
diff --git a/common/functions/src/scalars/conditionals/mod.rs b/common/functions/src/scalars/conditionals/mod.rs
index 3f9aa7dbb11f3..0eda1b71e34cf 100644
--- a/common/functions/src/scalars/conditionals/mod.rs
+++ b/common/functions/src/scalars/conditionals/mod.rs
@@ -14,8 +14,6 @@
 
 mod conditional;
 mod r#if;
-#[cfg(test)]
-mod if_test;
 
 pub use conditional::ConditionalFunction;
 pub use r#if::IfFunction;
diff --git a/common/functions/src/scalars/dates/mod.rs b/common/functions/src/scalars/dates/mod.rs
index 0cb0ab80217f9..3019f7a963c37 100644
--- a/common/functions/src/scalars/dates/mod.rs
+++ b/common/functions/src/scalars/dates/mod.rs
@@ -13,14 +13,6 @@
 // limitations under the License.
 
 mod date;
-#[cfg(test)]
-mod date_function_test;
-#[cfg(test)]
-mod date_test;
-
-#[cfg(test)]
-mod interval_function_test;
-
 mod interval_function;
 mod now;
 mod number_function;
@@ -38,6 +30,7 @@ pub use number_function::ToDayOfWeekFunction;
 pub use number_function::ToDayOfYearFunction;
 pub use number_function::ToHourFunction;
 pub use number_function::ToMinuteFunction;
+pub use number_function::ToMondayFunction;
 pub use number_function::ToMonthFunction;
 pub use number_function::ToSecondFunction;
 pub use number_function::ToStartOfISOYearFunction;
diff --git a/common/functions/src/scalars/expressions/mod.rs b/common/functions/src/scalars/expressions/mod.rs
index c695136c3f131..8478c5ce8a9e3 100644
--- a/common/functions/src/scalars/expressions/mod.rs
+++ b/common/functions/src/scalars/expressions/mod.rs
@@ -12,11 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(test)]
-mod cast_test;
-mod expression;
-
 mod cast;
+mod expression;
 
 pub use cast::CastFunction;
 pub use expression::ToCastFunction;
diff --git a/common/functions/src/scalars/hashes/mod.rs b/common/functions/src/scalars/hashes/mod.rs
index 86834ffb015f8..7522d0653e5d5 100644
--- a/common/functions/src/scalars/hashes/mod.rs
+++ b/common/functions/src/scalars/hashes/mod.rs
@@ -12,9 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(test)]
-mod siphash_test;
-
 mod hash;
 mod siphash;
 
diff --git a/common/functions/src/scalars/logics/mod.rs b/common/functions/src/scalars/logics/mod.rs
index 60c81cf652fb7..663bd8c92bafb 100644
--- a/common/functions/src/scalars/logics/mod.rs
+++ b/common/functions/src/scalars/logics/mod.rs
@@ -12,9 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(test)]
-mod logic_test;
-
 mod logic;
 mod logic_and;
 mod logic_not;
diff --git a/common/functions/src/scalars/maths/mod.rs b/common/functions/src/scalars/maths/mod.rs
index b8a3b452b2b9c..ccf55018c54e8 100644
--- a/common/functions/src/scalars/maths/mod.rs
+++ b/common/functions/src/scalars/maths/mod.rs
@@ -12,15 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(test)]
-mod abs_test;
-#[cfg(test)]
-mod crc32_test;
-#[cfg(test)]
-mod pi_test;
-#[cfg(test)]
-mod trigonometric_test;
-
 mod abs;
 mod crc32;
 mod math;
diff --git a/common/functions/src/scalars/mod.rs b/common/functions/src/scalars/mod.rs
index 70dd0c4fd1892..91d0960b98025 100644
--- a/common/functions/src/scalars/mod.rs
+++ b/common/functions/src/scalars/mod.rs
@@ -20,8 +20,6 @@ mod expressions;
 mod function;
 mod function_alias;
 mod function_column;
-#[cfg(test)]
-mod function_column_test;
 mod function_factory;
 mod function_literal;
 mod hashes;
diff --git a/common/functions/src/scalars/nullables/mod.rs b/common/functions/src/scalars/nullables/mod.rs
index edbf28a818374..68a16ce0272b3 100644
--- a/common/functions/src/scalars/nullables/mod.rs
+++ b/common/functions/src/scalars/nullables/mod.rs
@@ -15,8 +15,6 @@
 mod is_not_null;
 mod is_null;
 mod nullable;
-#[cfg(test)]
-mod nullable_test;
 
 pub use is_not_null::IsNotNullFunction;
 pub use is_null::IsNullFunction;
diff --git a/common/functions/src/scalars/others/mod.rs b/common/functions/src/scalars/others/mod.rs
index 3124ae1d142c1..9eaca1136107a 100644
--- a/common/functions/src/scalars/others/mod.rs
+++ b/common/functions/src/scalars/others/mod.rs
@@ -11,10 +11,9 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-#[cfg(test)]
-mod running_difference_function_test;
 
 mod other;
 mod running_difference_function;
+
 pub use other::OtherFunction;
 pub use running_difference_function::RunningDifferenceFunction;
diff --git a/common/functions/src/scalars/strings/mod.rs b/common/functions/src/scalars/strings/mod.rs
index ec56e0a59a6a9..7b8127bbfc820 100644
--- a/common/functions/src/scalars/strings/mod.rs
+++ b/common/functions/src/scalars/strings/mod.rs
@@ -12,9 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(test)]
-mod substring_test;
-
 mod string;
 mod substring;
 
diff --git a/common/functions/src/scalars/udfs/mod.rs b/common/functions/src/scalars/udfs/mod.rs
index be7386dc9d2b7..1cc353c96ad22 100644
--- a/common/functions/src/scalars/udfs/mod.rs
+++ b/common/functions/src/scalars/udfs/mod.rs
@@ -12,15 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#[cfg(test)]
-mod database_test;
-#[cfg(test)]
-mod to_type_name_test;
-#[cfg(test)]
-mod udf_example_test;
-#[cfg(test)]
-mod version_test;
-
 mod crash_me;
 mod database;
 mod exists;
diff --git a/common/functions/src/aggregates/aggregate_combinator_test.rs b/common/functions/tests/it/aggregates/aggregate_combinator.rs
similarity index 99%
rename from common/functions/src/aggregates/aggregate_combinator_test.rs
rename to common/functions/tests/it/aggregates/aggregate_combinator.rs
index 5bc502118c36d..9a6af974f0cc8 100644
--- a/common/functions/src/aggregates/aggregate_combinator_test.rs
+++ b/common/functions/tests/it/aggregates/aggregate_combinator.rs
@@ -15,10 +15,9 @@
 use bumpalo::Bump;
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::aggregates::AggregateFunctionFactory;
 use pretty_assertions::assert_eq;
 
-use crate::aggregates::aggregate_function_factory::AggregateFunctionFactory;
-
 #[test]
 fn test_aggregate_combinator_function() -> Result<()> {
     struct Test {
diff --git a/common/functions/src/aggregates/aggregate_function_test.rs b/common/functions/tests/it/aggregates/aggregate_function.rs
similarity index 99%
rename from common/functions/src/aggregates/aggregate_function_test.rs
rename to common/functions/tests/it/aggregates/aggregate_function.rs
index acd18a6adc594..a4bb1f4c2c40f 100644
--- a/common/functions/src/aggregates/aggregate_function_test.rs
+++ b/common/functions/tests/it/aggregates/aggregate_function.rs
@@ -15,11 +15,10 @@
 use bumpalo::Bump;
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::aggregates::*;
 use float_cmp::approx_eq;
 use pretty_assertions::assert_eq;
 
-use crate::aggregates::*;
-
 #[test]
 fn test_aggregate_function() -> Result<()> {
     struct Test {
diff --git a/common/functions/tests/it/aggregates/mod.rs b/common/functions/tests/it/aggregates/mod.rs
new file mode 100644
index 0000000000000..dec21f80b874f
--- /dev/null
+++ b/common/functions/tests/it/aggregates/mod.rs
@@ -0,0 +1,16 @@
+// Copyright 2020 Datafuse Labs.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+mod aggregate_combinator;
+mod aggregate_function;
diff --git a/common/functions/tests/it/main.rs b/common/functions/tests/it/main.rs
new file mode 100644
index 0000000000000..10fb3b2916a8a
--- /dev/null
+++ b/common/functions/tests/it/main.rs
@@ -0,0 +1,16 @@
+// Copyright 2020 Datafuse Labs.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+mod aggregates;
+mod scalars;
diff --git a/common/functions/src/scalars/arithmetics/arithmetic_test.rs b/common/functions/tests/it/scalars/arithmetics.rs
similarity index 99%
rename from common/functions/src/scalars/arithmetics/arithmetic_test.rs
rename to common/functions/tests/it/scalars/arithmetics.rs
index 5b7e13736c3d5..6501d08bb907f 100644
--- a/common/functions/src/scalars/arithmetics/arithmetic_test.rs
+++ b/common/functions/tests/it/scalars/arithmetics.rs
@@ -15,10 +15,9 @@
 use common_datavalues::chrono;
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::*;
-
 #[test]
 fn test_arithmetic_function() -> Result<()> {
     #[allow(dead_code)]
diff --git a/common/functions/src/scalars/comparisons/comparison_test.rs b/common/functions/tests/it/scalars/comparisons.rs
similarity index 99%
rename from common/functions/src/scalars/comparisons/comparison_test.rs
rename to common/functions/tests/it/scalars/comparisons.rs
index 05e947a491918..1f8e00e138f99 100644
--- a/common/functions/src/scalars/comparisons/comparison_test.rs
+++ b/common/functions/tests/it/scalars/comparisons.rs
@@ -14,10 +14,9 @@
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::*;
-
 #[test]
 fn test_comparison_function() -> Result<()> {
     #[allow(dead_code)]
diff --git a/common/functions/src/scalars/conditionals/if_test.rs b/common/functions/tests/it/scalars/conditionals.rs
similarity index 98%
rename from common/functions/src/scalars/conditionals/if_test.rs
rename to common/functions/tests/it/scalars/conditionals.rs
index 5ca4cc876f26a..9084eea6e0f6e 100644
--- a/common/functions/src/scalars/conditionals/if_test.rs
+++ b/common/functions/tests/it/scalars/conditionals.rs
@@ -15,10 +15,9 @@
 use common_datavalues::prelude::*;
 use common_datavalues::DataType;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::*;
-
 #[test]
 fn test_if_function() -> Result<()> {
     #[allow(dead_code)]
diff --git a/common/functions/src/scalars/dates/date_test.rs b/common/functions/tests/it/scalars/dates/date.rs
similarity index 98%
rename from common/functions/src/scalars/dates/date_test.rs
rename to common/functions/tests/it/scalars/dates/date.rs
index 14e71f465e172..25b2056dc373b 100644
--- a/common/functions/src/scalars/dates/date_test.rs
+++ b/common/functions/tests/it/scalars/dates/date.rs
@@ -11,13 +11,12 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
+
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use super::RoundFunction;
-use crate::scalars::*;
-
 #[allow(dead_code)]
 struct Test {
     name: &'static str,
diff --git a/common/functions/src/scalars/dates/date_function_test.rs b/common/functions/tests/it/scalars/dates/date_function.rs
similarity index 98%
rename from common/functions/src/scalars/dates/date_function_test.rs
rename to common/functions/tests/it/scalars/dates/date_function.rs
index 8a0e9bd2f32f7..bdb29f8e80ea3 100644
--- a/common/functions/src/scalars/dates/date_function_test.rs
+++ b/common/functions/tests/it/scalars/dates/date_function.rs
@@ -14,19 +14,7 @@
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
-
-use crate::scalars::dates::number_function::ToDayOfMonthFunction;
-use crate::scalars::dates::number_function::ToDayOfWeekFunction;
-use crate::scalars::dates::number_function::ToDayOfYearFunction;
-use crate::scalars::dates::number_function::ToMinuteFunction;
-use crate::scalars::dates::number_function::ToMondayFunction;
-use crate::scalars::dates::number_function::ToMonthFunction;
-use crate::scalars::Function;
-use crate::scalars::ToHourFunction;
-use crate::scalars::ToSecondFunction;
-use crate::scalars::ToYYYYMMDDFunction;
-use crate::scalars::ToYYYYMMDDhhmmssFunction;
-use crate::scalars::ToYYYYMMFunction;
+use common_functions::scalars::*;
 
 #[allow(dead_code)]
 struct Test {
diff --git a/common/functions/src/scalars/dates/interval_function_test.rs b/common/functions/tests/it/scalars/dates/interval_function.rs
similarity index 98%
rename from common/functions/src/scalars/dates/interval_function_test.rs
rename to common/functions/tests/it/scalars/dates/interval_function.rs
index 6e7a0f935a279..eda3bd2452b9d 100644
--- a/common/functions/src/scalars/dates/interval_function_test.rs
+++ b/common/functions/tests/it/scalars/dates/interval_function.rs
@@ -16,9 +16,8 @@ use common_datablocks::DataBlock;
 use common_datavalues::chrono::DateTime;
 use common_datavalues::prelude::*;
 use common_exception::Result;
-
-use crate::scalars::MonthsArithmeticFunction;
-use crate::scalars::SecondsArithmeticFunction;
+use common_functions::scalars::MonthsArithmeticFunction;
+use common_functions::scalars::SecondsArithmeticFunction;
 
 #[test]
 fn test_add_months() -> Result<()> {
diff --git a/common/functions/tests/it/scalars/dates/mod.rs b/common/functions/tests/it/scalars/dates/mod.rs
new file mode 100644
index 0000000000000..0e9291bbb4186
--- /dev/null
+++ b/common/functions/tests/it/scalars/dates/mod.rs
@@ -0,0 +1,17 @@
+// Copyright 2020 Datafuse Labs.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+mod date;
+mod date_function;
+mod interval_function;
diff --git a/common/functions/src/scalars/expressions/cast_test.rs b/common/functions/tests/it/scalars/expressions.rs
similarity index 99%
rename from common/functions/src/scalars/expressions/cast_test.rs
rename to common/functions/tests/it/scalars/expressions.rs
index 640860d4f6a9c..b4ec6131ee777 100644
--- a/common/functions/src/scalars/expressions/cast_test.rs
+++ b/common/functions/tests/it/scalars/expressions.rs
@@ -14,10 +14,9 @@
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::*;
-
 #[test]
 fn test_cast_function() -> Result<()> {
     #[allow(dead_code)]
diff --git a/common/functions/src/scalars/function_column_test.rs b/common/functions/tests/it/scalars/function_column.rs
similarity index 97%
rename from common/functions/src/scalars/function_column_test.rs
rename to common/functions/tests/it/scalars/function_column.rs
index 754b2cae4dcec..7cd47bc05cb2b 100644
--- a/common/functions/src/scalars/function_column_test.rs
+++ b/common/functions/tests/it/scalars/function_column.rs
@@ -15,8 +15,7 @@
 use common_datablocks::*;
 use common_datavalues::prelude::*;
 use common_exception::Result;
-
-use crate::scalars::*;
+use common_functions::scalars::*;
 
 #[test]
 fn test_column_function() -> Result<()> {
diff --git a/common/functions/src/scalars/hashes/siphash_test.rs b/common/functions/tests/it/scalars/hashes.rs
similarity index 99%
rename from common/functions/src/scalars/hashes/siphash_test.rs
rename to common/functions/tests/it/scalars/hashes.rs
index bb1732c7fbc9a..1caf64f9b8d93 100644
--- a/common/functions/src/scalars/hashes/siphash_test.rs
+++ b/common/functions/tests/it/scalars/hashes.rs
@@ -15,8 +15,7 @@
 use common_datavalues::columns::DataColumn;
 use common_datavalues::prelude::*;
 use common_exception::Result;
-
-use crate::scalars::SipHashFunction;
+use common_functions::scalars::SipHashFunction;
 
 #[test]
 fn test_siphash_function() -> Result<()> {
diff --git a/common/functions/src/scalars/logics/logic_test.rs b/common/functions/tests/it/scalars/logics.rs
similarity index 99%
rename from common/functions/src/scalars/logics/logic_test.rs
rename to common/functions/tests/it/scalars/logics.rs
index 80c23d253ae7c..3488cb254bd33 100644
--- a/common/functions/src/scalars/logics/logic_test.rs
+++ b/common/functions/tests/it/scalars/logics.rs
@@ -14,10 +14,9 @@
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::*;
-
 #[test]
 fn test_logic_function() -> Result<()> {
     #[allow(dead_code)]
diff --git a/common/functions/src/scalars/maths/abs_test.rs b/common/functions/tests/it/scalars/maths/abs.rs
similarity index 98%
rename from common/functions/src/scalars/maths/abs_test.rs
rename to common/functions/tests/it/scalars/maths/abs.rs
index 6c7f571ad9890..02b6c5edaee1e 100644
--- a/common/functions/src/scalars/maths/abs_test.rs
+++ b/common/functions/tests/it/scalars/maths/abs.rs
@@ -15,8 +15,7 @@
 use common_datavalues::prelude::*;
 use common_exception::ErrorCode;
 use common_exception::Result;
-
-use crate::scalars::*;
+use common_functions::scalars::*;
 
 #[test]
 fn test_abs_function() -> Result<()> {
diff --git a/common/functions/src/scalars/maths/crc32_test.rs b/common/functions/tests/it/scalars/maths/crc32.rs
similarity index 98%
rename from common/functions/src/scalars/maths/crc32_test.rs
rename to common/functions/tests/it/scalars/maths/crc32.rs
index d694f219bd0e8..409e9b3a1b079 100644
--- a/common/functions/src/scalars/maths/crc32_test.rs
+++ b/common/functions/tests/it/scalars/maths/crc32.rs
@@ -14,8 +14,7 @@
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
-
-use crate::scalars::*;
+use common_functions::scalars::*;
 
 #[test]
 fn test_crc32_function() -> Result<()> {
diff --git a/common/functions/tests/it/scalars/maths/mod.rs b/common/functions/tests/it/scalars/maths/mod.rs
new file mode 100644
index 0000000000000..7c63be17a2510
--- /dev/null
+++ b/common/functions/tests/it/scalars/maths/mod.rs
@@ -0,0 +1,18 @@
+// Copyright 2020 Datafuse Labs.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+mod abs;
+mod crc32;
+mod pi;
+mod trigonometric;
diff --git a/common/functions/src/scalars/maths/pi_test.rs b/common/functions/tests/it/scalars/maths/pi.rs
similarity index 97%
rename from common/functions/src/scalars/maths/pi_test.rs
rename to common/functions/tests/it/scalars/maths/pi.rs
index 81c9299ea939d..5ec0ee66822e5 100644
--- a/common/functions/src/scalars/maths/pi_test.rs
+++ b/common/functions/tests/it/scalars/maths/pi.rs
@@ -16,8 +16,7 @@ use std::f64::consts::PI;
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
-
-use crate::scalars::*;
+use common_functions::scalars::*;
 
 #[test]
 fn test_pi_function() -> Result<()> {
diff --git a/common/functions/src/scalars/maths/trigonometric_test.rs b/common/functions/tests/it/scalars/maths/trigonometric.rs
similarity index 99%
rename from common/functions/src/scalars/maths/trigonometric_test.rs
rename to common/functions/tests/it/scalars/maths/trigonometric.rs
index 94ee40ac5ea14..a2a16c8c3d715 100644
--- a/common/functions/src/scalars/maths/trigonometric_test.rs
+++ b/common/functions/tests/it/scalars/maths/trigonometric.rs
@@ -16,8 +16,7 @@ use std::f64::consts::PI;
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
-
-use crate::scalars::*;
+use common_functions::scalars::*;
 
 #[test]
 fn test_trigonometic_function() -> Result<()> {
diff --git a/common/functions/tests/it/scalars/mod.rs b/common/functions/tests/it/scalars/mod.rs
new file mode 100644
index 0000000000000..45c0f6b737409
--- /dev/null
+++ b/common/functions/tests/it/scalars/mod.rs
@@ -0,0 +1,26 @@
+// Copyright 2020 Datafuse Labs.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+mod arithmetics;
+mod comparisons;
+mod conditionals;
+mod dates;
+mod expressions;
+mod function_column;
+mod hashes;
+mod logics;
+mod maths;
+mod nullables;
+mod others;
+mod udfs;
diff --git a/common/functions/src/scalars/nullables/nullable_test.rs b/common/functions/tests/it/scalars/nullables.rs
similarity index 98%
rename from common/functions/src/scalars/nullables/nullable_test.rs
rename to common/functions/tests/it/scalars/nullables.rs
index 0ae0dee4a0bdd..4c3b81bf1ff37 100644
--- a/common/functions/src/scalars/nullables/nullable_test.rs
+++ b/common/functions/tests/it/scalars/nullables.rs
@@ -15,10 +15,9 @@
 use common_datavalues::prelude::*;
 use common_datavalues::DataType;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::*;
-
 #[test]
 fn test_nullable_function() -> Result<()> {
     #[allow(dead_code)]
diff --git a/common/functions/src/scalars/others/running_difference_function_test.rs b/common/functions/tests/it/scalars/others.rs
similarity index 99%
rename from common/functions/src/scalars/others/running_difference_function_test.rs
rename to common/functions/tests/it/scalars/others.rs
index 897904aae4b3e..6598cc0b32a01 100644
--- a/common/functions/src/scalars/others/running_difference_function_test.rs
+++ b/common/functions/tests/it/scalars/others.rs
@@ -19,8 +19,7 @@ use common_arrow::arrow::array::Int64Array;
 use common_datablocks::*;
 use common_datavalues::prelude::*;
 use common_exception::Result;
-
-use crate::scalars::RunningDifferenceFunction;
+use common_functions::scalars::RunningDifferenceFunction;
 
 macro_rules! run_difference_constant_test {
     ($method_name:ident, $primitive_type:ty, $logic_type:ident, $result_primitive_type:ty, $result_logic_type:ident, $array_type:ident) => {
diff --git a/common/functions/src/scalars/strings/substring_test.rs b/common/functions/tests/it/scalars/strings.rs
similarity index 98%
rename from common/functions/src/scalars/strings/substring_test.rs
rename to common/functions/tests/it/scalars/strings.rs
index ea93f98f1cba9..aba3c93c3a0b7 100644
--- a/common/functions/src/scalars/strings/substring_test.rs
+++ b/common/functions/tests/it/scalars/strings.rs
@@ -16,8 +16,8 @@ use common_datavalues::prelude::*;
 use common_exception::Result;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::Function;
-use crate::scalars::SubstringFunction;
+use common_functions::scalars::Function;
+use common_functions::scalars::SubstringFunction;
 
 #[test]
 fn test_substring_function() -> Result<()> {
diff --git a/common/functions/src/scalars/udfs/database_test.rs b/common/functions/tests/it/scalars/udfs/database.rs
similarity index 98%
rename from common/functions/src/scalars/udfs/database_test.rs
rename to common/functions/tests/it/scalars/udfs/database.rs
index 5e9ef4b48d09e..65077eeaca300 100644
--- a/common/functions/src/scalars/udfs/database_test.rs
+++ b/common/functions/tests/it/scalars/udfs/database.rs
@@ -14,10 +14,9 @@
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::*;
-
 #[test]
 fn test_database_function() -> Result<()> {
     #[allow(dead_code)]
diff --git a/common/functions/tests/it/scalars/udfs/mod.rs b/common/functions/tests/it/scalars/udfs/mod.rs
new file mode 100644
index 0000000000000..b9aba2569b3c1
--- /dev/null
+++ b/common/functions/tests/it/scalars/udfs/mod.rs
@@ -0,0 +1,18 @@
+// Copyright 2020 Datafuse Labs.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+mod database;
+mod to_type_name;
+mod udf_example;
+mod version;
diff --git a/common/functions/src/scalars/udfs/to_type_name_test.rs b/common/functions/tests/it/scalars/udfs/to_type_name.rs
similarity index 98%
rename from common/functions/src/scalars/udfs/to_type_name_test.rs
rename to common/functions/tests/it/scalars/udfs/to_type_name.rs
index d34ab5fe629ac..01374e57707c4 100644
--- a/common/functions/src/scalars/udfs/to_type_name_test.rs
+++ b/common/functions/tests/it/scalars/udfs/to_type_name.rs
@@ -14,10 +14,9 @@
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::*;
-
 #[test]
 fn test_to_type_name_function() -> Result<()> {
     #[allow(dead_code)]
diff --git a/common/functions/src/scalars/udfs/udf_example_test.rs b/common/functions/tests/it/scalars/udfs/udf_example.rs
similarity index 98%
rename from common/functions/src/scalars/udfs/udf_example_test.rs
rename to common/functions/tests/it/scalars/udfs/udf_example.rs
index 04f4110af3377..7209ac565800f 100644
--- a/common/functions/src/scalars/udfs/udf_example_test.rs
+++ b/common/functions/tests/it/scalars/udfs/udf_example.rs
@@ -18,8 +18,7 @@ use common_datavalues::DataField;
 use common_datavalues::DataSchemaRefExt;
 use common_datavalues::DataType;
 use common_exception::Result;
-
-use crate::scalars::*;
+use common_functions::scalars::*;
 
 #[test]
 fn test_udf_example_function() -> Result<()> {
diff --git a/common/functions/src/scalars/udfs/version_test.rs b/common/functions/tests/it/scalars/udfs/version.rs
similarity index 98%
rename from common/functions/src/scalars/udfs/version_test.rs
rename to common/functions/tests/it/scalars/udfs/version.rs
index 560f6fdce6860..599499d22e22c 100644
--- a/common/functions/src/scalars/udfs/version_test.rs
+++ b/common/functions/tests/it/scalars/udfs/version.rs
@@ -14,10 +14,9 @@
 
 use common_datavalues::prelude::*;
 use common_exception::Result;
+use common_functions::scalars::*;
 use pretty_assertions::assert_eq;
 
-use crate::scalars::*;
-
 #[test]
 fn test_version_function() -> Result<()> {
     #[allow(dead_code)]