tolerate missing project name in validation

src/poetry/factory.py

@@ -370,9 +370,10 @@ def validate(
 
         dependencies = {canonicalize_name(d) for d in dependencies}
 
-        if canonicalize_name(config["name"]) in dependencies:
+        project_name = config.get("name")
+        if project_name is not None and canonicalize_name(project_name) in dependencies:
             results["errors"].append(
-                f"Project name ({config['name']}) is same as one of its dependencies"
+                f"Project name ({project_name}) is same as one of its dependencies"
             )
 
         return results

tests/fixtures/nameless_pyproject/pyproject.toml

@@ -0,0 +1,8 @@
+[tool.poetry]
+version = "0.1.0"
+description = ""
+authors = ["Foo <foo@bar.com>"]
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = "^3.10"

tests/test_factory.py

@@ -524,20 +524,27 @@ def test_create_poetry_fails_on_invalid_configuration(
     with pytest.raises(RuntimeError) as e:
         Factory().create_poetry(fixture_dir("invalid_pyproject") / "pyproject.toml")
 
-    jsonschema_error = "'description' is a required property"
-    fastjsonschema_error = "data must contain ['description'] properties"
-
-    expected_template = """\
+    expected = """\
 The Poetry configuration is invalid:
-  - {schema_error}
+  - data must contain ['description'] properties
   - Project name (invalid) is same as one of its dependencies
 """
-    expected = {
-        expected_template.format(schema_error=schema_error)
-        for schema_error in (jsonschema_error, fastjsonschema_error)
-    }
 
-    assert str(e.value) in expected
+    assert str(e.value) == expected
+
+
+def test_create_poetry_fails_on_nameless_project(
+    fixture_dir: FixtureDirGetter,
+) -> None:
+    with pytest.raises(RuntimeError) as e:
+        Factory().create_poetry(fixture_dir("nameless_pyproject") / "pyproject.toml")
+
+    expected = """\
+The Poetry configuration is invalid:
+  - data must contain ['name'] properties
+"""
+
+    assert str(e.value) == expected
 
 
 def test_create_poetry_with_local_config(fixture_dir: FixtureDirGetter) -> None: