factory: merge legacy dependencies and groups

This change ensures that existence of legacy "dev-dependency" section
does not break when "dev" group is added for new dependencies.

src/poetry/core/factory.py

@@ -5,6 +5,7 @@
 from typing import Any
 from typing import Dict
 from typing import List
+from typing import Mapping
 from typing import Optional
 from typing import Union
 from warnings import warn
@@ -14,12 +15,19 @@
 
 
 if TYPE_CHECKING:
+    from poetry.core.packages.dependency_group import DependencyGroup
     from poetry.core.packages.project_package import ProjectPackage
     from poetry.core.packages.types import DependencyTypes
     from poetry.core.poetry import Poetry
     from poetry.core.spdx.license import License
     from poetry.core.version.markers import BaseMarker
 
+    DependencyConstraint = Union[str, Dict[str, Any]]
+    DependencyConfig = Mapping[
+        str, Union[List[DependencyConstraint], DependencyConstraint]
+    ]
+
+
 logger = logging.getLogger(__name__)
 
 
@@ -62,6 +70,42 @@ def get_package(cls, name: str, version: str) -> "ProjectPackage":
 
         return ProjectPackage(name, version, version)
 
+    @classmethod
+    def _add_package_group_dependencies(
+        cls,
+        package: "ProjectPackage",
+        group: Union[str, "DependencyGroup"],
+        dependencies: "DependencyConfig",
+    ) -> None:
+        if isinstance(group, str):
+            if package.has_dependency_group(group):
+                group = package.dependency_group(group)
+            else:
+                from poetry.core.packages.dependency_group import DependencyGroup
+
+                group = DependencyGroup(group)
+
+        for name, constraints in dependencies.items():
+            _constraints = (
+                constraints if isinstance(constraints, list) else [constraints]
+            )
+            for _constraint in _constraints:
+                if name.lower() == "python":
+                    if group.name == "default":
+                        package.python_versions = _constraint
+                    continue
+
+                group.add_dependency(
+                    cls.create_dependency(
+                        name,
+                        _constraint,
+                        groups=[group.name],
+                        root_dir=package.root_dir,
+                    )
+                )
+
+        package.add_dependency_group(group)
+
     @classmethod
     def configure_package(
         cls,
@@ -105,81 +149,25 @@ def configure_package(
             package.platform = config["platform"]
 
         if "dependencies" in config:
-            group = DependencyGroup("default")
-            for name, constraint in config["dependencies"].items():
-                if name.lower() == "python":
-                    package.python_versions = constraint
-                    continue
-
-                if isinstance(constraint, list):
-                    for _constraint in constraint:
-                        group.add_dependency(
-                            cls.create_dependency(
-                                name, _constraint, root_dir=package.root_dir
-                            )
-                        )
-
-                    continue
-
-                group.add_dependency(
-                    cls.create_dependency(name, constraint, root_dir=package.root_dir)
-                )
-
-            package.add_dependency_group(group)
+            cls._add_package_group_dependencies(
+                package=package, group="default", dependencies=config["dependencies"]
+            )
 
         if with_groups and "group" in config:
             for group_name, group_config in config["group"].items():
                 group = DependencyGroup(
                     group_name, optional=group_config.get("optional", False)
                 )
-                for name, constraint in group_config["dependencies"].items():
-                    if isinstance(constraint, list):
-                        for _constraint in constraint:
-                            group.add_dependency(
-                                cls.create_dependency(
-                                    name,
-                                    _constraint,
-                                    groups=[group_name],
-                                    root_dir=package.root_dir,
-                                )
-                            )
-
-                        continue
-
-                    group.add_dependency(
-                        cls.create_dependency(
-                            name,
-                            constraint,
-                            groups=[group_name],
-                            root_dir=package.root_dir,
-                        )
-                    )
-
-                package.add_dependency_group(group)
-
-        if with_groups and "dev-dependencies" in config:
-            group = DependencyGroup("dev")
-            for name, constraint in config["dev-dependencies"].items():
-                if isinstance(constraint, list):
-                    for _constraint in constraint:
-                        group.add_dependency(
-                            cls.create_dependency(
-                                name,
-                                _constraint,
-                                groups=["dev"],
-                                root_dir=package.root_dir,
-                            )
-                        )
-
-                    continue
-
-                group.add_dependency(
-                    cls.create_dependency(
-                        name, constraint, groups=["dev"], root_dir=package.root_dir
-                    )
+                cls._add_package_group_dependencies(
+                    package=package,
+                    group=group,
+                    dependencies=group_config["dependencies"],
                 )
 
-            package.add_dependency_group(group)
+        if with_groups and "dev-dependencies" in config:
+            cls._add_package_group_dependencies(
+                package=package, group="dev", dependencies=config["dev-dependencies"]
+            )
 
         extras = config.get("extras", {})
         for extra_name, requirements in extras.items():
@@ -232,7 +220,7 @@ def configure_package(
     def create_dependency(
         cls,
         name: str,
-        constraint: Union[str, Dict[str, Any]],
+        constraint: "DependencyConstraint",
         groups: Optional[List[str]] = None,
         root_dir: Optional[Path] = None,
     ) -> "DependencyTypes":

src/poetry/core/packages/package.py

@@ -373,8 +373,11 @@ def is_root(self) -> bool:
     def add_dependency_group(self, group: "DependencyGroup") -> None:
         self._dependency_groups[group.name] = group
 
+    def has_dependency_group(self, name: str) -> bool:
+        return name in self._dependency_groups
+
     def dependency_group(self, name: str) -> "DependencyGroup":
-        if name not in self._dependency_groups:
+        if not self.has_dependency_group(name):
             raise ValueError(f'The dependency group "{name}" does not exist.')
 
         return self._dependency_groups[name]

tests/fixtures/project_with_groups_and_explicit_default/README.rst

@@ -0,0 +1,2 @@
+My Package
+==========

tests/fixtures/project_with_groups_and_explicit_default/pyproject.toml

@@ -0,0 +1,17 @@
+[tool.poetry]
+name = "simple-project"
+version = "0.1.0"
+description = ""
+authors = ["Your Name <you@example.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.7"
+
+[tool.poetry.group.default.dependencies]
+aiohttp = "^2.17.0"
+
+[tools.poetry]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"

tests/fixtures/project_with_groups_and_legacy_dev/README.rst

@@ -0,0 +1,2 @@
+My Package
+==========

tests/fixtures/project_with_groups_and_legacy_dev/pyproject.toml

@@ -0,0 +1,20 @@
+[tool.poetry]
+name = "simple-project"
+version = "0.1.0"
+description = ""
+authors = ["Your Name <you@example.com>"]
+
+[tool.poetry.dependencies]
+python = "^3.7"
+
+[tool.poetry.group.dev.dependencies]
+pre-commit = "^2.17.0"
+
+[tool.poetry.dev-dependencies]
+pytest = "^5.2"
+
+[tools.poetry]
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"

tests/test_factory.py

@@ -233,3 +233,29 @@ def test_create_poetry_fails_with_invalid_dev_dependencies_iff_with_dev_is_true(
     Factory().create_poetry(
         fixtures_dir / "project_with_invalid_dev_deps", with_groups=False
     )
+
+
+def test_create_poetry_with_groups_and_legacy_dev():
+    poetry = Factory().create_poetry(
+        fixtures_dir / "project_with_groups_and_legacy_dev"
+    )
+
+    package = poetry.package
+    dependencies = package.all_requires
+
+    assert len(dependencies) == 2
+    assert {dependency.name for dependency in dependencies} == {"pytest", "pre-commit"}
+
+
+def test_create_poetry_with_groups_and_explicit_default():
+    poetry = Factory().create_poetry(
+        fixtures_dir / "project_with_groups_and_explicit_default"
+    )
+
+    package = poetry.package
+    dependencies = package.requires
+
+    assert len(dependencies) == 1
+    assert {dependency.name for dependency in dependencies} == {
+        "aiohttp",
+    }