Change the test environment construction method

Author: manta1130

.github/workflows/ci.yml

@@ -103,13 +103,29 @@ jobs:
         toolchain:
           - 1.42.0-x86_64-unknown-linux-gnu
           - stable-x86_64-unknown-linux-gnu
+        python-version:
+          - '3.6' # https://packages.ubuntu.com/bionic/python3
+          - '3.8' # https://packages.ubuntu.com/focal/python3
 
-    name: Expand_test (${{ matrix.toolchain }})
+    name: Expand_test (${{ matrix.toolchain }}, ${{ matrix.python-version }})
     runs-on: ubuntu-18.04
 
     steps:
       - name: Checkout
         uses: actions/checkout@v2
 
+      - name: 'Setup `${{ matrix.toolchain }}`'
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ matrix.toolchain }}
+          override: true
+          profile: minimal
+          components: rustfmt
+
+      - name: Setup Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+
       - name: expand.py tests
         run: bash ./.github/workflows/test-expand.sh

.github/workflows/test-expand.sh

@@ -6,10 +6,6 @@ SCRIPT_DIR=$(cd $(dirname $0); pwd)
 TEST_FILE="test.rs"
 FILE_HEAD="fn main() {}"
 
-if [ -v CI ];then
-    rustup component add rustfmt 
-fi
-
 for MODULE in ${TEST_MODULES[@]};do
      echo Test module $MODULE 
      python3 $SCRIPT_DIR/../../expand.py $MODULE > $TMP_PATH/$TEST_FILE