Add a migration to add a version pin to pytest

[noissue]

plugin-template

@@ -15,6 +15,7 @@ import yaml
 from pathlib import Path
 
 from jinja2 import Environment, FileSystemLoader
+from packaging.requirements import Requirement
 
 
 DEFAULT_SETTINGS = {
@@ -329,11 +330,44 @@ def main():
         file_path = os.path.join(plugin_root_dir, "template_config.yml")
         print("\nAn updated plugin template config written to {path}.\n".format(path=file_path))
 
+    if "github" in sections:
+        migrate_pytest_pin(plugin_root_dir)
+
     if plugin_root_dir:
         print("\nDeprecation check:")
         check_for_deprecated_files(plugin_root_dir, sections)
 
 
+def migrate_pytest_pin(plugin_root_dir):
+    for item in ["func", "unit"]:
+        with open(f"{plugin_root_dir}/{item}test_requirements.txt", "r") as fp:
+            lines = fp.readlines()
+        modified = False
+        found = False
+        result = []
+        for line in lines:
+            try:
+                req = Requirement(line)
+            except ValueError:
+                result.append(line)
+                continue
+            if req.name == "pytest":
+                found = True
+                if not req.specifier:
+                    req.specifier = "<8"
+                    result.append(str(req) + "\n")
+                    modified = True
+                    continue
+            result.append(line)
+        if not found:
+            result.append("pytest<8\n")
+            modified = True
+
+        if modified:
+            with open(f"{plugin_root_dir}/{item}test_requirements.txt", "w") as fp:
+                fp.writelines(result)
+
+
 def to_nice_yaml(data):
     """Implement a filter for Jinja 2 templates to render human readable YAML."""
     return yaml.dump(data, indent=2, allow_unicode=True, default_flow_style=False)