new test added

Author: davidsanfal

conan/tools/system/pip_manager.py

@@ -29,7 +29,10 @@ def _create_venv(self):
         python_interpreter = self._conanfile.conf.get("tools.system.pipenv:python_interpreter",
                                                       default=os.path.realpath(default_python) if default_python else None)
         if not python_interpreter:
-            raise ConanException("PipEnv could not find a Python executable path.")
+            raise ConanException("PipEnv could not find a Python executable path."
+                                 "Please set 'tools.system.pipenv:python_interpreter' to '</your/python/full/path>' "
+                                 "in the [conf] section of the profile, or in the command line using "
+                                 "'-c tools.system.pipenv:python_interpreter=</your/python/full/path>'")
 
         try:
             self._conanfile.run(cmd_args_to_string([python_interpreter, '-m', 'venv', self._env_dir]))

test/integration/tools/system/pip_manager_test.py

@@ -0,0 +1,38 @@
+from conan.tools.system import PipEnv
+from unittest.mock import patch
+import mock
+import pytest
+from unittest.mock import PropertyMock
+from conan.errors import ConanException
+from conan.internal.model.settings import Settings
+from conan.test.utils.mocks import ConanFileMock
+
+
+def test_pipenv_conf():
+    # https://github.com/conan-io/conan/issues/11661
+    conanfile = ConanFileMock()
+    conanfile.settings = Settings()
+    conanfile.conf.define("tools.system.pipenv:python_interpreter", "/python/interpreter/from/config")
+    result = "/python/interpreter/from/config -m venv /Users/davidsanfal/repos/github/conan-io/testenv/pip_venv_None"
+    pipenv = PipEnv(conanfile, "testenv")
+
+    def fake_run(command, win_bash=False, subsystem=None, env=None, ignore_errors=False, quiet=False):
+        assert command == result
+        return 100
+    conanfile.run = fake_run
+    pipenv._create_venv()
+
+
+@patch('shutil.which')
+def test_pipenv_error_message(mock_shutil_which):
+    # https://github.com/conan-io/conan/issues/11661
+    conanfile = ConanFileMock()
+    conanfile.settings = Settings()
+    mock_shutil_which.return_value = None
+    with pytest.raises(ConanException) as exc_info:
+        pipenv = PipEnv(conanfile, "testenv")
+        pipenv._create_venv()
+    assert exc_info.value.args[0] == "PipEnv could not find a Python executable path." \
+                                     "Please set 'tools.system.pipenv:python_interpreter' to '</your/python/full/path>' " \
+                                     "in the [conf] section of the profile, or in the command line using " \
+                                     "'-c tools.system.pipenv:python_interpreter=</your/python/full/path>'"