Merge pull request #12 from WindSoilder/exceptiongroup_init

Use *args to fit exception convention.

Author: njsmith

exceptiongroup/__init__.py

@@ -26,7 +26,7 @@ class ExceptionGroup(BaseException):
     """
 
     def __init__(self, message, exceptions, sources):
-        super().__init__(message)
+        super().__init__(message, exceptions, sources)
         self.exceptions = list(exceptions)
         for exc in self.exceptions:
             if not isinstance(exc, BaseException):
@@ -52,6 +52,12 @@ def __copy__(self):
         new_group.__cause__ = self.__cause__
         return new_group
 
+    def __str__(self):
+        return ", ".join(repr(exc) for exc in self.exceptions)
+
+    def __repr__(self):
+        return "<ExceptionGroup: {}>".format(self)
+
 
 from . import _monkeypatch
 from ._tools import split, catch

exceptiongroup/_tests/test_exceptiongroup.py

@@ -0,0 +1,49 @@
+import pytest
+
+from exceptiongroup import ExceptionGroup
+
+
+def test_exception_group_init():
+    memberA = ValueError("A")
+    memberB = RuntimeError("B")
+    group = ExceptionGroup(
+        "many error.", [memberA, memberB], [str(memberA), str(memberB)]
+    )
+    assert group.exceptions == [memberA, memberB]
+    assert group.message == "many error."
+    assert group.sources == [str(memberA), str(memberB)]
+    assert group.args == (
+        "many error.",
+        [memberA, memberB],
+        [str(memberA), str(memberB)],
+    )
+
+
+def test_exception_group_when_members_are_not_exceptions():
+    with pytest.raises(TypeError):
+        ExceptionGroup(
+            "error",
+            [RuntimeError("RuntimeError"), "error2"],
+            ["RuntimeError", "error2"],
+        )
+
+
+def test_exception_group_init_when_exceptions_messages_not_equal():
+    with pytest.raises(ValueError):
+        ExceptionGroup(
+            "many error.", [ValueError("A"), RuntimeError("B")], ["A"]
+        )
+
+
+def test_exception_group_str():
+    memberA = ValueError("memberA")
+    memberB = ValueError("memberB")
+    group = ExceptionGroup(
+        "many error.", [memberA, memberB], [str(memberA), str(memberB)]
+    )
+    assert "memberA" in str(group)
+    assert "memberB" in str(group)
+
+    assert "ExceptionGroup: " in repr(group)
+    assert "memberA" in repr(group)
+    assert "memberB" in repr(group)