chore: warn if consumer/provider name has spaces

Discoeverd by user-reported issue in #850.

Signed-off-by: JP-Ellis <[email protected]>

src/pact/message_consumer.py

@@ -63,6 +63,12 @@ def __init__(
             PendingDeprecationWarning,
             stacklevel=2,
         )
+        if len(name.split()) > 1:
+            warnings.warn(
+                "Consumer name should not contain spaces.",
+                UserWarning,
+                stacklevel=2
+            )
         self.name = name
         self.service_cls = service_cls
         self.tags = tags

src/pact/provider.py

@@ -21,4 +21,10 @@ def __init__(self, name):
             PendingDeprecationWarning,
             stacklevel=2,
         )
+        if len(name.split()) > 1:
+            warnings.warn(
+                "Provider name should not contain spaces.",
+                UserWarning,
+                stacklevel=2,
+            )
         self.name = name

tests/test_issue.py

@@ -0,0 +1,67 @@
+"""
+Tests for user-reported issues.
+"""
+
+import os
+from pathlib import Path
+
+import pytest
+
+from pact import MessageConsumer, Provider, matchers
+
+
+def test_github_850_issue() -> None:
+    """
+    See https://github.com/pact-foundation/pact-python/issues/850.
+
+    User reported an issue with Pact files not being written when using consumer
+    and provider names with spaces. A warning was added to the code to alert the
+    user that the names should not contain spaces.
+    """
+    contract = MessageConsumer("My Consumer").has_pact_with(
+        Provider("My Provider"),
+        pact_dir="pacts",
+    )
+
+    # Define os dados do evento
+    event_data = {
+        "invoice_id": "12345",
+        "amount": 100.00,
+        "currency": "USD",
+        "created": matchers.Format().iso_8601_datetime(),
+    }
+
+    # Cria uma mensagem que representa o evento
+    contract.given("Create contract").expects_to_receive(
+        "An event of contract"
+    ).with_content(event_data)
+
+    with contract:
+        pass
+
+    pact_file = Path("pacts/my_consumer-my_provider.json")
+    # The file should only be created on non-Windows systems
+    assert pact_file.exists() == (os.name != "nt")
+
+
+def test_github_850_fix(recwarn: pytest.WarningsRecorder) -> None:
+    """
+    See https://github.com/pact-foundation/pact-python/issues/850.
+
+    User reported an issue with Pact files not being written when using consumer
+    and provider names with spaces. A warning was added to the code to alert the
+    user that the names should not contain spaces.
+    """
+    MessageConsumer("My Consumer").has_pact_with(
+        Provider("My Provider"),
+        pact_dir="pacts",
+    )
+
+    # Check for warnings
+    warnings = [str(warning.message) for warning in recwarn]
+    assert any(
+        "Consumer name should not contain spaces." in warning for warning in warnings
+    )
+    assert any(
+        "Provider name should not contain spaces." in warning for warning in warnings
+    )