fix: run installer tests from any directory

Locker will set package.source_url relative to lock path, this
made it so that tests were failing if run outside root directory
because lock path was set to Path(__file__).

With using project_root fixture as lock path now tests can be run
from any directory.

tests/conftest.py

@@ -405,3 +405,8 @@ def command_tester_factory(app, env):
 def do_lock(command_tester_factory, poetry):
     command_tester_factory("lock").execute()
     assert poetry.locker.lock.exists()
+
+
+@pytest.fixture
+def project_root():
+    return Path(__file__).parent.parent

tests/installation/test_installer.py

@@ -85,8 +85,8 @@ class CustomInstalledRepository(InstalledRepository):
 
 
 class Locker(BaseLocker):
-    def __init__(self):
-        self._lock = TOMLFile(Path.cwd().joinpath("poetry.lock"))
+    def __init__(self, lock_path):
+        self._lock = TOMLFile(Path(lock_path).joinpath("poetry.lock"))
         self._written_data = None
         self._locked = False
         self._content_hash = self._get_content_hash()
@@ -153,8 +153,8 @@ def installed():
 
 
 @pytest.fixture()
-def locker():
-    return Locker()
+def locker(project_root):
+    return Locker(lock_path=project_root)
 
 
 @pytest.fixture()

tests/installation/test_installer_old.py

@@ -41,8 +41,8 @@ class CustomInstalledRepository(InstalledRepository):
 
 
 class Locker(BaseLocker):
-    def __init__(self):
-        self._lock = TOMLFile(Path.cwd().joinpath("poetry.lock"))
+    def __init__(self, lock_path):
+        self._lock = TOMLFile(Path(lock_path).joinpath("poetry.lock"))
         self._written_data = None
         self._locked = False
         self._content_hash = self._get_content_hash()
@@ -109,8 +109,8 @@ def installed():
 
 
 @pytest.fixture()
-def locker():
-    return Locker()
+def locker(project_root):
+    return Locker(lock_path=project_root)
 
 
 @pytest.fixture()