diff --git a/.github/workflows/bats-test.yml b/.github/workflows/bats-test.yml
index b41795d..d49baea 100644
--- a/.github/workflows/bats-test.yml
+++ b/.github/workflows/bats-test.yml
@@ -3,24 +3,22 @@ on:
   push:
     paths:
       - AliyunOpenApiSDK.sh
-      - test.bats.sh
+      - test/test.bats.sh
   pull_request:
     paths:
       - AliyunOpenApiSDK.sh
-      - test.bats.sh
+      - test/test.bats.sh
 
 jobs:
   test:
     runs-on: ubuntu-18.04 # Test on old version bash
     steps:
-    - name: Setup BATS
-      uses: mig4/setup-bats@v1
-      with:
-        bats-version: 1.8.2
     - name: Check out code
       uses: actions/checkout@v3
+        with:
+          submodules: true
     - name: Run test
       env:
         AliAccessKeyId: ${{ secrets.ALIACCESSKEYID }}
         AliAccessKeySecret: ${{ secrets.ALIACCESSKEYSECRET }}
-      run: bats test.bats.sh
+        run: ./test/bats/bin/bats test/test.bats.sh
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..b7efcb4
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "test/bats"]
+	path = test/bats
+	url = https://github.com/bats-core/bats-core.git
+[submodule "test/test_helper/bats-support"]
+	path = test/test_helper/bats-support
+	url = https://github.com/bats-core/bats-support.git
+[submodule "test/test_helper/bats-assert"]
+	path = test/test_helper/bats-assert
+	url = https://github.com/bats-core/bats-assert.git
diff --git a/test/bats b/test/bats
new file mode 160000
index 0000000..e8c840b
--- /dev/null
+++ b/test/bats
@@ -0,0 +1 @@
+Subproject commit e8c840b58f0833e23461c682655fe540aa923f85
diff --git a/test.bats.sh b/test/test.bats.sh
similarity index 95%
rename from test.bats.sh
rename to test/test.bats.sh
index a78ee15..4b04eac 100755
--- a/test.bats.sh
+++ b/test/test.bats.sh
@@ -32,8 +32,7 @@ test_timestamp_rpc() { #@test
     run _aliapi_timestamp_rpc
     [[ $status -eq 0 ]]
     timestamp=$output
-
-    run grep -P "^\d{4}-(0[1-9]|1[0-2])-(0[1-9]|[12]\d|3[01])T(0\d|[1]\d|2[0-3]):[0-5]\d:[0-5]\d(Z|\+00:00)$" <<< "$timestamp"
+    run grep -E "^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])T(0[0-9]|[1][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9](Z|\+00:00)$" <<< "$timestamp"
     [[ $status -eq 0 ]]
     [[ $output == "$timestamp" ]]
 }
diff --git a/test/test_helper/bats-assert b/test/test_helper/bats-assert
new file mode 160000
index 0000000..78fa631
--- /dev/null
+++ b/test/test_helper/bats-assert
@@ -0,0 +1 @@
+Subproject commit 78fa631d1370562d2cd4a1390989e706158e7bf0
diff --git a/test/test_helper/bats-support b/test/test_helper/bats-support
new file mode 160000
index 0000000..24a72e1
--- /dev/null
+++ b/test/test_helper/bats-support
@@ -0,0 +1 @@
+Subproject commit 24a72e14349690bcbf7c151b9d2d1cdd32d36eb1