migrate some files to pytest

tests/scripts.py

@@ -0,0 +1,59 @@
+import pytest
+
+COPY_SCRIPT = """
+import os
+import shutil
+import sys
+
+if os.path.isfile(sys.argv[1]):
+    shutil.copyfile(sys.argv[1], sys.argv[2])
+else:
+    shutil.copytree(sys.argv[1], sys.argv[2])
+"""
+
+
+def _add_script(tmp_dir, path, contents=""):
+    script, *_ = tmp_dir.gen(path, contents)
+    if hasattr(tmp_dir, "scm"):
+        tmp_dir.scm_add(path, commit=f"add {path}")
+    return script.fs_path
+
+
+@pytest.fixture
+def append_foo_script(tmp_dir):
+    return _add_script(
+        tmp_dir,
+        "append_foo.py",
+        """
+import sys
+from pathlib import Path
+
+with Path(sys.argv[1]).open("a+", encoding="utf-8") as f:
+    f.write("foo")
+""",
+    )
+
+
+@pytest.fixture
+def copy_script(
+    tmp_dir,
+):
+    return _add_script(tmp_dir, "copy.py", COPY_SCRIPT)
+
+
+@pytest.fixture
+def head_script(tmp_dir):
+    """Output first line of each file to different file with '-1' appended.
+    Useful for tracking multiple outputs/dependencies which are not a copy
+    of each others.
+    """
+    return _add_script(
+        tmp_dir,
+        "head.py",
+        """
+import sys
+for file in sys.argv[1:]:
+    with open(file) as f, open(file +"-1","w+") as w:
+        w.write(f.readline())
+""",
+    )