add test for julia version support

.github/workflows/languages.yaml

@@ -67,7 +67,10 @@ jobs:
       if: matrix.language == 'haskell'
     - uses: r-lib/actions/setup-r@v2
       if: matrix.os == 'ubuntu-latest' && matrix.language == 'r'
-
+    - uses: julia-actions/install-juliaup@v2
+      if: matrix.language == 'julia'
+    - run: juliaup add 1.10.10
+      if: matrix.language == 'julia'
     - name: install deps
       run: python -mpip install -e . -r requirements-dev.txt
     - name: run tests

pre_commit/languages/julia.py

@@ -106,7 +106,10 @@ def install_environment(
         # copy `src` files if they exist
         src_dir = prefix.path('src')
         if os.path.isdir(src_dir):
-            shutil.copytree(src_dir, os.path.join(envdir, 'src'))
+            shutil.copytree(
+                src_dir, os.path.join(envdir, 'src'),
+                dirs_exist_ok=True,
+            )
 
         # Julia code to instantiate the hook environment
         julia_code = """

tests/languages/julia_test.py

@@ -28,6 +28,22 @@ def test_julia_hook(tmp_path):
     assert run_language(tmp_path, julia, 'src/main.jl') == expected
 
 
+def test_julia_hook_version(tmp_path):
+    code = """
+    using Example
+    function main()
+        println("Hello, Julia $(VERSION)!")
+    end
+    main()
+    """
+    _make_hook(tmp_path, code)
+    expected = (0, b'Hello, Julia 1.10.10!\n')
+    assert run_language(
+        tmp_path, julia, 'src/main.jl',
+        version='1.10.10',
+    ) == expected
+
+
 def test_julia_hook_manifest(tmp_path):
     code = """
     using Example