Support custom coverage data locations

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Revision History
 
+## 2.1 (unreleased)
+
+- Added support for custom `coverage.py` data locations.
+
 ## 2.0 (2018-09-08)
 
 - BREAKING: Renamed PyPI project to `coveragespace`.

coveragespace/plugins.py

@@ -84,7 +84,7 @@ def _find_plugin(cwd, allow_missing=False):
     if allow_missing:
         return None
 
-    raise RuntimeError(msg + '.')
+    raise RuntimeError(msg)
 
 
 def _launched_recently(path):
@@ -100,7 +100,10 @@ class CoveragePy(BasePlugin):  # pylint: disable=no-init
     """Coverage extractor for the coverage.py format."""
 
     def matches(self, cwd):
-        return '.coverage' in os.listdir(cwd)
+        return any((
+            '.coverage' in os.listdir(cwd),
+            '.coveragerc' in os.listdir(cwd),
+        ))
 
     def get_coverage(self, cwd):
         os.chdir(cwd)

coveragespace/tests/test_plugins.py

@@ -1,4 +1,6 @@
 # pylint: disable=missing-docstring,unused-variable,unused-argument,expression-not-assigned,singleton-comparison
+
+import os
 import time
 
 import pytest
@@ -23,6 +25,23 @@ def coveragepy_data(tmpdir):
         with open("foobar.py", 'w') as stream:
             pass
         with open(".coverage", 'w') as stream:
+            stream.write("""
+            !coverage.py: This is a private format, don\'t read it directly!
+            {"arcs":{"foobar.py": [[-1, 2]]}}
+            """.strip())
+
+    @pytest.fixture
+    def coveragepy_data_custom(tmpdir):
+        cwd = tmpdir.chdir()
+        with open("foobar.py", 'w') as stream:
+            pass
+        with open(".coveragerc", 'w') as stream:
+            stream.write("""
+            [run]
+            data_file = .cache/coverage
+            """.strip())
+        os.makedirs('.cache')
+        with open(".cache/coverage", 'w') as stream:
             stream.write("""
             !coverage.py: This is a private format, don\'t read it directly!
             {"arcs":{"foobar.py": [[-1, 3]]}}
@@ -32,6 +51,10 @@ def coveragepy_data(tmpdir):
     def it_supports_coveragepy(coveragepy_data):
         expect(get_coverage()) == 42.5
 
+    @patch('coverage.Coverage', MockCoverage)
+    def it_supports_coveragepy_with_custom_location(coveragepy_data_custom):
+        expect(get_coverage()) == 42.5
+
 
 def describe_launched_recently():
 

pyproject.toml

@@ -1,7 +1,7 @@
 [tool.poetry]
 
 name = "coveragespace"
-version = "2.0.0"
+version = "2.1.0b1"
 description = "A place to track your code coverage metrics."
 
 license = "MIT"