python3Packages.pytestCheckHook: support enabledTestPaths

pkgs/development/interpreters/python/hooks/default.nix

@@ -204,6 +204,55 @@ in
               ] ++ previousPythonAttrs.disabledTestPaths or [ ];
             })
           );
+          enabledTestPaths = objprint.overridePythonAttrs (previousPythonAttrs: {
+            pname = "test-pytestCheckHook-enabledTestPaths-${previousPythonAttrs.pname}";
+            enabledTestPaths = [
+              "tests/test_basic.py"
+            ] ++ previousPythonAttrs.enabledTestPaths or [ ];
+          });
+          enabledTestPaths-nonexistent = testers.testBuildFailure (
+            objprint.overridePythonAttrs (previousPythonAttrs: {
+              pname = "test-pytestCheckHook-enabledTestPaths-nonexistent-${previousPythonAttrs.pname}";
+              enabledTestPaths = [
+                "tests/test_foo.py"
+              ] ++ previousPythonAttrs.enabledTestPaths or [ ];
+            })
+          );
+          enabledTestPaths-dir = objprint.overridePythonAttrs (previousPythonAttrs: {
+            pname = "test-pytestCheckHook-enabledTestPaths-dir-${previousPythonAttrs.pname}";
+            enabledTestPaths = [
+              "tests"
+            ] ++ previousPythonAttrs.enabledTestPaths or [ ];
+          });
+          enabledTestPaths-dir-disabledTestPaths = objprint.overridePythonAttrs (previousPythonAttrs: {
+            pname = "test-pytestCheckHook-enabledTestPaths-dir-disabledTestPaths-${previousPythonAttrs.pname}";
+            enabledTestPaths = [
+              "tests"
+            ] ++ previousPythonAttrs.enabledTestPaths or [ ];
+            disabledTestPaths = [
+              "tests/test_basic.py"
+            ] ++ previousPythonAttrs.disabledTestPaths or [ ];
+          });
+          enabledTestPaths-glob = objprint.overridePythonAttrs (previousPythonAttrs: {
+            pname = "test-pytestCheckHook-enabledTestPaths-glob-${previousPythonAttrs.pname}";
+            enabledTestPaths = [
+              "tests/test_obj*.py"
+            ] ++ previousPythonAttrs.enabledTestPaths or [ ];
+          });
+          enabledTestPaths-glob-nonexistent = testers.testBuildFailure (
+            objprint.overridePythonAttrs (previousPythonAttrs: {
+              pname = "test-pytestCheckHook-enabledTestPaths-glob-nonexistent-${previousPythonAttrs.pname}";
+              enabledTestPaths = [
+                "tests/test_foo*.py"
+              ] ++ previousPythonAttrs.enabledTestPaths or [ ];
+            })
+          );
+          enabledTestPaths-item = objprint.overridePythonAttrs (previousPythonAttrs: {
+            pname = "test-pytestCheckHook-enabledTestPaths-item-${previousPythonAttrs.pname}";
+            enabledTestPaths = [
+              "tests/test_basic.py::TestBasic"
+            ] ++ previousPythonAttrs.enabledTestPaths or [ ];
+          });
         };
       };
     } ./pytest-check-hook.sh

pkgs/development/interpreters/python/hooks/pytest-check-hook.sh

@@ -10,7 +10,33 @@ function pytestCheckPhase() {
     # Compose arguments
     local -a flagsArray=(-m pytest)
 
-    local -a _pathsArray=()
+    local -a _pathsArray
+    local path
+
+    _pathsArray=()
+    concatTo _pathsArray enabledTestPaths
+    for path in "${_pathsArray[@]}"; do
+        if [[ "$path" =~ "::" ]]; then
+            flagsArray+=("$path")
+        else
+            # The `|| kill "$$"` trick propagates the errors from the process substitutiton subshell,
+            # which is suggested by a StackOverflow answer: https://unix.stackexchange.com/a/217643
+            readarray -t -O"${#flagsArray[@]}" flagsArray < <(@pythonCheckInterpreter@ - "$path" <<EOF || kill "$$")
+import glob
+import sys
+path_glob=sys.argv[1]
+if not len(path_glob):
+    sys.exit('Got an empty enabled tests path glob. Aborting')
+path_expanded = glob.glob(path_glob)
+if not len(path_expanded):
+    sys.exit('Enabled tests path glob "{}" does not match any paths. Aborting'.format(path_glob))
+for path in path_expanded:
+    print(path)
+EOF
+        fi
+    done
+
+    _pathsArray=()
     concatTo _pathsArray disabledTestPaths
     for path in "${_pathsArray[@]}"; do
         if [[ "$path" =~ "::" ]]; then

pkgs/development/interpreters/python/mk-python-derivation.nix

@@ -108,6 +108,7 @@ let
     "format"
     "disabledTestPaths"
     "disabledTests"
+    "enabledTestPaths"
     "pytestFlags"
     "pytestFlagsArray"
     "unittestFlags"
@@ -446,6 +447,19 @@ let
         "unittestFlags"
         "unittestFlagsArray"
       ] attrs
+      //
+        lib.mapAttrs
+          (
+            name: value:
+            lib.throwIf (attrs.${name} == [ ])
+              "${lib.getName finalAttrs}: ${name} must be unspecified, null or a non-empty list."
+              attrs.${name}
+          )
+          (
+            getOptionalAttrs [
+              "enabledTestPaths"
+            ] attrs
+          )
     )
   );