Add reprs to wiring markers

src/dependency_injector/providers.pyx

@@ -1599,7 +1599,7 @@ cdef class ConfigurationOption(Provider):
         return self._root
 
     def get_name(self):
-        return ".".join((self._root.get_name(), self._get_self_name()))
+        return f"{self._root.get_name()}.{self._get_self_name()}"
 
     def get_name_segments(self):
         return self._name

src/dependency_injector/wiring.py

@@ -25,6 +25,7 @@ from typing import (
     Type,
     TypeVar,
     Union,
+    assert_never,
     cast,
 )
 from warnings import warn
@@ -791,6 +792,9 @@ class TypeModifier(Modifier):
     ) -> providers.Provider:
         return provider.as_(self.type_)
 
+    def __repr__(self) -> str:
+        return f"{self.__class__.__name__}({self.type_!r})"
+
 
 def as_int() -> TypeModifier:
     """Return int type modifier."""
@@ -809,8 +813,8 @@ def as_(type_: Type) -> TypeModifier:
 
 class RequiredModifier(Modifier):
 
-    def __init__(self) -> None:
+    def __init__(self, type_modifier: Optional[TypeModifier] = None) -> None:
-        self.type_modifier = None
+        self.type_modifier = type_modifier
 
     def as_int(self) -> Self:
         self.type_modifier = TypeModifier(int)
@@ -834,6 +838,11 @@ class RequiredModifier(Modifier):
             provider = provider.as_(self.type_modifier.type_)
         return provider
 
+    def __repr__(self) -> str:
+        if self.type_modifier:
+            return f"{self.__class__.__name__}({self.type_modifier!r})"
+        return f"{self.__class__.__name__}()"
+
 
 def required() -> RequiredModifier:
     """Return required modifier."""
@@ -853,6 +862,9 @@ class InvariantModifier(Modifier):
         invariant_segment = providers_map.resolve_provider(self.id)
         return provider[invariant_segment]
 
+    def __repr__(self) -> str:
+        return f"{self.__class__.__name__}({self.id!r})"
+
 
 def invariant(id: str) -> InvariantModifier:
     """Return invariant modifier."""
@@ -893,8 +905,28 @@ class ProvidedInstance(Modifier):
                 provider = provider[value]
             elif type_ == ProvidedInstance.TYPE_CALL:
                 provider = provider.call()
+            else:
+                assert_never(type_)
         return provider
 
+    def _format_segments(self) -> str:
+        segments = []
+        for type_, value in self.segments:
+            if type_ == ProvidedInstance.TYPE_ATTRIBUTE:
+                segments.append(f".{value}")
+            elif type_ == ProvidedInstance.TYPE_ITEM:
+                segments.append(f"[{value!r}]")
+            elif type_ == ProvidedInstance.TYPE_CALL:
+                segments.append(".call()")
+            else:
+                assert_never(type_)
+        return "".join(segments)
+
+    __str__ = _format_segments
+
+    def __repr__(self) -> str:
+        return f"{self.__class__.__name__}(){self._format_segments()}"
+
 
 def provided() -> ProvidedInstance:
     """Return provided instance modifier."""
@@ -910,7 +942,7 @@ MarkerItem = Union[
 ]
 
 
-if TYPE_CHECKING:
+if TYPE_CHECKING:  # noqa
 
     class _Marker(Protocol):
         __IS_MARKER__: bool
@@ -918,6 +950,7 @@ if TYPE_CHECKING:
         def __call__(self) -> Self: ...
         def __getattr__(self, item: str) -> Self: ...
         def __getitem__(self, item: Any) -> Any: ...
+        def __repr__(self) -> str: ...
 
     Provide: _Marker
     Provider: _Marker
@@ -946,6 +979,12 @@ else:
         def __call__(self) -> Self:
             return self
 
+        def __repr__(self) -> str:
+            cls_name = self.__class__.__name__
+            if self.modifier:
+                return f"{cls_name}[{self.provider!r}, {self.modifier!r}]"
+            return f"{cls_name}[{self.provider!r}]"
+
     class Provide(_Marker): ...
 
     class Provider(_Marker): ...

tests/unit/wiring/provider_ids/test_main_py36.py

@@ -1,5 +1,6 @@
 """Main wiring tests."""
 
+import re
 from decimal import Decimal
 
 from dependency_injector import errors
@@ -67,7 +68,7 @@ def test_module_attributes_wiring():
 
 def test_module_attribute_wiring_with_invalid_marker(container: Container):
     from samples.wiring import module_invalid_attr_injection
-    with raises(Exception, match="Unknown type of marker {0}".format(module_invalid_attr_injection.service)):
+    with raises(Exception, match=re.escape("Unknown type of marker {0}".format(module_invalid_attr_injection.service))):
         container.wire(modules=[module_invalid_attr_injection])
 
 

tests/unit/wiring/string_ids/test_main_py36.py

@@ -1,5 +1,6 @@
 """Main wiring tests."""
 
+import re
 from decimal import Decimal
 
 from pytest import fixture, mark, raises
@@ -68,7 +69,7 @@ def test_module_attributes_wiring():
 
 def test_module_attribute_wiring_with_invalid_marker(container: Container):
     from samples.wiringstringids import module_invalid_attr_injection
-    with raises(Exception, match="Unknown type of marker {0}".format(module_invalid_attr_injection.service)):
+    with raises(Exception, match=re.escape("Unknown type of marker {0}".format(module_invalid_attr_injection.service))):
         container.wire(modules=[module_invalid_attr_injection])
 
 

tests/unit/wiring/test_reprs.py

@@ -0,0 +1,42 @@
+from dependency_injector.wiring import (
+    Closing,
+    InvariantModifier,
+    Provide,
+    ProvidedInstance,
+    RequiredModifier,
+    TypeModifier,
+)
+
+
+def test_type_modifier_repr() -> None:
+    assert repr(TypeModifier(int)) == f"TypeModifier({int!r})"
+
+
+def test_required_modifier_repr() -> None:
+    assert repr(RequiredModifier()) == "RequiredModifier()"
+
+
+def test_required_modifier_with_type_repr() -> None:
+    type_modifier = TypeModifier(int)
+    required_modifier = RequiredModifier(type_modifier)
+    assert repr(required_modifier) == f"RequiredModifier({type_modifier!r})"
+
+
+def test_invariant_modifier_repr() -> None:
+    assert repr(InvariantModifier("test")) == "InvariantModifier('test')"
+
+
+def test_provided_instance_repr() -> None:
+    provided_instance = ProvidedInstance().test["attr"].call()
+
+    assert repr(provided_instance) == "ProvidedInstance().test['attr'].call()"
+
+
+def test_marker_repr() -> None:
+    assert repr(Closing[Provide["test"]]) == "Closing[Provide['test']]"
+
+
+def test_marker_with_modifier_repr() -> None:
+    marker = Provide["test", RequiredModifier()]
+
+    assert repr(marker) == "Provide['test', RequiredModifier()]"