Fix Poetry optional dependency test

Signed-off-by: Adnan Raza <imadnanraza4@gmail.com>

Author: Mars-60

tests/packagedcode/data/pypi/poetry/optional-poetry.lock-expected.json

@@ -399,37 +399,10 @@ def test_parse_poetry_lock_univers(self):
         self.check_packages_data(package, expected_loc, regen=REGEN_TEST_FIXTURES)
 
     def test_parse_poetry_lock_package_optional(self):
-        test_file = self.get_temp_file('poetry.lock')
-        with open(test_file, 'w') as lockfile:
-            lockfile.write('''\
-[[package]]
-name = "required-dep"
-version = "1.0.0"
-description = "required dependency"
-optional = false
-python-versions = ">=3.8"
-
-[[package]]
-name = "optional-dep"
-version = "2.0.0"
-description = "optional dependency"
-optional = true
-python-versions = ">=3.8"
-
-[metadata]
-lock-version = "2.0"
-python-versions = ">=3.8"
-content-hash = "test"
-''')
-
-        package_data = list(pypi.PoetryLockHandler.parse(test_file))[0]
-        dependencies_by_purl = {
-            dependency['purl']: dependency
-            for dependency in package_data.dependencies
-        }
-
-        assert dependencies_by_purl['pkg:pypi/required-dep@1.0.0']['is_optional'] is False
-        assert dependencies_by_purl['pkg:pypi/optional-dep@2.0.0']['is_optional'] is True
+        test_file = self.get_test_loc('pypi/poetry/optional/poetry.lock')
+        package = pypi.PoetryLockHandler.parse(test_file)
+        expected_loc = self.get_test_loc('pypi/poetry/optional-poetry.lock-expected.json')
+        self.check_packages_data(package, expected_loc, regen=REGEN_TEST_FIXTURES)
 
     def test_parse_pyproject_toml_poetry_univers(self):
         test_file = self.get_test_loc('pypi/poetry/univers/pyproject.toml')