From be6693a25123d8e8cf80aca5cb9a73a8f81dd584 Mon Sep 17 00:00:00 2001
From: Ned Batchelder <ned@nedbatchelder.com>
Date: Sat, 8 Dec 2012 22:00:49 -0500
Subject: A blunt instrument for tracking down problems during testing.

---
 Makefile             | 2 +-
 coverage/control.py  | 7 +++++++
 test/coveragetest.py | 4 ++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 89685498..031a14fe 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,7 @@ tests:
 	tox -e py27
 
 metacov: 
-	COVERAGE_COVERAGE=yes tox
+	COVERAGE_COVERAGE=yes tox -e py27
 
 metahtml:
 	python igor.py combine_html
diff --git a/coverage/control.py b/coverage/control.py
index fa441cd1..44837f14 100644
--- a/coverage/control.py
+++ b/coverage/control.py
@@ -439,6 +439,10 @@ class coverage(object):
                 socket.gethostname(), os.getpid(),
                 random.randint(0, 999999)
                 )
+            if _TEST_NAME_FILE:
+                with open(_TEST_NAME_FILE) as f:
+                    test_name = f.read()
+                    data_suffix += "." + test_name
 
         self._harvest_data()
         self.data.write(suffix=data_suffix)
@@ -701,3 +705,6 @@ def process_startup():
             cov.cover_dir = "Please measure coverage.py!"
         cov.start()
         cov._warn_no_data = False
+
+
+_TEST_NAME_FILE = "" # r"c:\foo\covtest.txt"
diff --git a/test/coveragetest.py b/test/coveragetest.py
index 73284638..7dee7ebb 100644
--- a/test/coveragetest.py
+++ b/test/coveragetest.py
@@ -40,6 +40,10 @@ class CoverageTest(TestCase):
     def setUp(self):
         super(CoverageTest, self).setUp()
 
+        if coverage._TEST_NAME_FILE:
+            with open(coverage._TEST_NAME_FILE, "w") as f:
+                f.write("%s_%s" % (self.__class__.__name__, self._testMethodName))
+
         # Tell newer unittest implementations to print long helpful messages.
         self.longMessage = True
 
-- 
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