Adds test case for report generation failure

tests/conftest.py

@@ -3,6 +3,7 @@
 import pytest_codecov.codecov
 import pytest_codecov.git
 
+from coverage.misc import CoverageException
 from importlib import reload
 
 pytest_plugins = 'pytester'
@@ -113,13 +114,14 @@ class DummyUploader:
     #       more exhaustively.
 
     def __init__(self, slug, **kwargs):
-        pass
+        self.fail_report_generation = False
 
     def write_network_files(self, files):
         pass
 
     def add_coverage_report(self, cov, **kwargs):
-        pass
+        if self.fail_report_generation:
+            raise CoverageException('test exception')
 
     def get_payload(self):
         return 'stub'
@@ -131,12 +133,24 @@ def upload(self):
         pass
 
 
+class DummyUploaderFactory:
+
+    fail_report_generation = False
+
+    def __call__(self, slug, **kwargs):
+        inst = DummyUploader(slug, **kwargs)
+        inst.fail_report_generation = self.fail_report_generation
+        return inst
+
+
 @pytest.fixture
 def dummy_uploader(monkeypatch):
+    factory = DummyUploaderFactory()
     monkeypatch.setattr(
         'pytest_codecov.codecov.CodecovUploader',
-        DummyUploader
+        factory
     )
+    return factory
 
 
 # NOTE: Ensure modules are reloaded when coverage.py is looking.

tests/test_plugin.py

@@ -111,3 +111,22 @@ def test_upload_report(pytester, dummy_reporter, dummy_uploader,
         'Branch: master\n'
         'Commit: deadbeef\n'
     ) in dummy_reporter.text
+
+
+def test_upload_report_generation_failure(
+    pytester, dummy_reporter, dummy_uploader,
+    dummy_cov, no_gitpython
+):
+    dummy_uploader.fail_report_generation = True
+    config = pytester.parseconfig(
+        '--codecov',
+        '--codecov-token=12345678-1234-1234-1234-1234567890ab',
+        '--codecov-slug=foo/bar',
+        '--codecov-branch=master',
+        '--codecov-commit=deadbeef'
+    )
+    plugin = CodecovPlugin()
+    plugin.upload_report(dummy_reporter, config, dummy_cov)
+    assert (
+        'ERROR: Failed to generate XML report: test exception'
+    ) in dummy_reporter.text