fix: if only single compiler error, avoid wrapping in a new error

src/ape/managers/compilers.py

@@ -157,11 +157,18 @@ def compile(
                 errors.append(err)
                 continue
 
-        if errors:
+        if len(errors) == 1:
+            # If only 1 error, just raise that.
+            raise errors[0]
+
+        elif len(errors) > 1:
+            # Raise a combined error.
             formatted_errors = [f"{e}" for e in errors]
             error_message = "\n\n".join(formatted_errors)
             raise CompilerError(error_message)
 
+        # else: successfully compiled everything!
+
     def compile_source(
         self,
         compiler_name: str,

tests/functional/conftest.py

@@ -634,45 +634,53 @@ def method_abi_with_struct_input():
 
 
 @pytest.fixture
-def mock_compiler(mocker):
-    mock = mocker.MagicMock()
-    mock.name = "mock"
-    mock.ext = ".__mock__"
-    mock.tracked_settings = []
-    mock.ast = None
-    mock.pcmap = None
-
-    def mock_compile(paths, project=None, settings=None):
-        settings = settings or {}
-        mock.tracked_settings.append(settings)
-        result = []
-        for path in paths:
-            if path.suffix == mock.ext:
-                name = path.stem
-                code = to_hex(123)
-                data = {
-                    "contractName": name,
-                    "abi": mock.abi,
-                    "deploymentBytecode": code,
-                    "sourceId": f"{project.contracts_folder.name}/{path.name}",
-                }
-                if ast := mock.ast:
-                    data["ast"] = ast
-                if pcmap := mock.pcmap:
-                    data["pcmap"] = pcmap
-
-                # Check for mocked overrides
-                overrides = mock.overrides
-                if isinstance(overrides, dict):
-                    data = {**data, **overrides}
-
-                contract_type = ContractType.model_validate(data)
-                result.append(contract_type)
-
-        return result
-
-    mock.compile.side_effect = mock_compile
-    return mock
+def mock_compiler(make_mock_compiler):
+    return make_mock_compiler()
+
+
+@pytest.fixture
+def make_mock_compiler(mocker):
+    def fn(name="mock"):
+        mock = mocker.MagicMock()
+        mock.name = "mock"
+        mock.ext = f".__{name}__"
+        mock.tracked_settings = []
+        mock.ast = None
+        mock.pcmap = None
+
+        def mock_compile(paths, project=None, settings=None):
+            settings = settings or {}
+            mock.tracked_settings.append(settings)
+            result = []
+            for path in paths:
+                if path.suffix == mock.ext:
+                    name = path.stem
+                    code = to_hex(123)
+                    data = {
+                        "contractName": name,
+                        "abi": mock.abi,
+                        "deploymentBytecode": code,
+                        "sourceId": f"{project.contracts_folder.name}/{path.name}",
+                    }
+                    if ast := mock.ast:
+                        data["ast"] = ast
+                    if pcmap := mock.pcmap:
+                        data["pcmap"] = pcmap
+
+                    # Check for mocked overrides
+                    overrides = mock.overrides
+                    if isinstance(overrides, dict):
+                        data = {**data, **overrides}
+
+                    contract_type = ContractType.model_validate(data)
+                    result.append(contract_type)
+
+            return result
+
+        mock.compile.side_effect = mock_compile
+        return mock
+
+    return fn
 
 
 @pytest.fixture

tests/functional/test_compilers.py

@@ -71,7 +71,18 @@ def test_flatten_contract(compilers, project_with_contract):
         compilers.flatten_contract(Path("contract.foo"))
 
 
-def test_contract_type_collision(compilers, project_with_contract, mock_compiler):
+@pytest.mark.parametrize("factory", (str, Path))
+def test_compile(compilers, project_with_contract, factory):
+    """
+    Testing both stringified paths and path-object paths.
+    """
+    path = next(iter(project_with_contract.sources.paths))
+    actual = compilers.compile((factory(path),))
+    contract_name = path.stem
+    assert contract_name in [x.name for x in actual]
+
+
+def test_compile_contract_type_collision(compilers, project_with_contract, mock_compiler):
     _ = compilers.registered_compilers  # Ensures cached property is set.
 
     # Hack in our mock compiler.
@@ -98,13 +109,16 @@ def test_contract_type_collision(compilers, project_with_contract, mock_compiler
             del compilers.__dict__["registered_compilers"][mock_compiler.ext]
 
 
+def test_compile_empty(compilers):
+    # Also, we are asserting it does no fail.
+    assert list(compilers.compile([])) == []
+
+
 def test_compile_with_settings(mock_compiler, compilers, project_with_contract):
     new_contract = project_with_contract.path / f"AMockContract{mock_compiler.ext}"
     new_contract.write_text("foobar", encoding="utf8")
     settings = {"mock": {"foo": "bar"}}
-
     _ = compilers.registered_compilers  # Ensures cached property is set.
-
     # Hack in our mock compiler.
     compilers.__dict__["registered_compilers"][mock_compiler.ext] = mock_compiler
 
@@ -119,11 +133,66 @@ def test_compile_with_settings(mock_compiler, compilers, project_with_contract):
     assert actual == settings["mock"]
 
 
-def test_compile_str_path(compilers, project_with_contract):
-    path = next(iter(project_with_contract.sources.paths))
-    actual = compilers.compile((str(path),))
-    contract_name = path.stem
-    assert contract_name in [x.name for x in actual]
+def test_compile_errors(mock_compiler, compilers, project_with_contract):
+    new_contract = project_with_contract.path / f"AMockContract{mock_compiler.ext}"
+    new_contract.write_text("foobar", encoding="utf8")
+
+    class MyCustomCompilerError(CompilerError):
+        pass
+
+    mock_compiler.compile.side_effect = MyCustomCompilerError
+    _ = compilers.registered_compilers  # Ensures cached property is set.
+    # Hack in our mock compiler.
+    compilers.__dict__["registered_compilers"][mock_compiler.ext] = mock_compiler
+
+    try:
+        with pytest.raises(MyCustomCompilerError):
+            list(compilers.compile([new_contract], project=project_with_contract))
+
+    finally:
+        if mock_compiler.ext in compilers.__dict__.get("registered_compilers", {}):
+            del compilers.__dict__["registered_compilers"][mock_compiler.ext]
+
+
+def test_compile_multiple_errors(
+    mock_compiler, make_mock_compiler, compilers, project_with_contract
+):
+    """
+    Simulating getting errors from multiple compilers.
+    We should get all the errors.
+    """
+    second_mock_compiler = make_mock_compiler("mock2")
+    new_contract_0 = project_with_contract.path / f"AMockContract{mock_compiler.ext}"
+    new_contract_0.write_text("foobar", encoding="utf8")
+    new_contract_1 = project_with_contract.path / f"AMockContract{second_mock_compiler.ext}"
+    new_contract_1.write_text("foobar2", encoding="utf8")
+
+    expected_0 = "this is expected message 0"
+    expected_1 = "this is expected message 1"
+
+    class MyCustomCompilerError0(CompilerError):
+        def __init__(self):
+            super().__init__(expected_0)
+
+    class MyCustomCompilerError1(CompilerError):
+        def __init__(self):
+            super().__init__(expected_1)
+
+    mock_compiler.compile.side_effect = MyCustomCompilerError0
+    second_mock_compiler.compile.side_effect = MyCustomCompilerError1
+    _ = compilers.registered_compilers  # Ensures cached property is set.
+    # Hack in our mock compilers.
+    compilers.__dict__["registered_compilers"][mock_compiler.ext] = mock_compiler
+    compilers.__dict__["registered_compilers"][second_mock_compiler.ext] = second_mock_compiler
+
+    try:
+        match = rf"{expected_0}\n\n{expected_1}"
+        with pytest.raises(CompilerError, match=match):
+            list(compilers.compile([new_contract_0, new_contract_1], project=project_with_contract))
+
+    finally:
+        if mock_compiler.ext in compilers.__dict__.get("registered_compilers", {}):
+            del compilers.__dict__["registered_compilers"][mock_compiler.ext]
 
 
 def test_compile_source(compilers):