2 files changed, 65 insertions, 0 deletions
diff --git a/test/farm/run/run_timid.py b/test/farm/run/run_timid.py
new file mode 100644
index 00000000..bbc322e2
--- /dev/null
+++ b/test/farm/run/run_timid.py
@@ -0,0 +1,50 @@
+# Test that the --timid command line argument properly swaps the tracer function
+# for a simpler one.
+#
+# This is complicated by the fact that alltests.cmd will run the test suite
+# twice for each version: once with a compiled C-based trace function, and once
+# without it, to also test the Python trace function.  So this test has to
+# examine an environment variable set in alltests.cmd to know whether to expect
+# to see the C trace function or not.
+
+import os
+
+copy("src", "out")
+run("""
+    coverage -e -x showtrace.py regular
+    coverage -e -x --timid showtrace.py timid
+    """, rundir="out", outfile="showtraceout.txt")
+
+# When running timidly, the trace function is always Python.
+contains("out/showtraceout.txt", "timid coverage.collector.PyTracer")
+
+if os.environ.get('COVERAGE_TEST_TRACER', 'c') == 'c':
+    # If the C trace function is being tested, then regular running should have
+    # the C function (shown as None in f_trace since it isn't a Python
+    # function).
+    contains("out/showtraceout.txt", "regular None")
+else:
+    # If the Python trace function is being tested, then regular running will
+    # also show the Python function.
+    contains("out/showtraceout.txt", "regular coverage.collector.PyTracer")
+
+# Try the environment variable.
+old_opts = os.environ.get('COVERAGE_OPTIONS')
+os.environ['COVERAGE_OPTIONS'] = '--timid'
+
+run("""
+    coverage -e -x showtrace.py regular
+    coverage -e -x --timid showtrace.py timid
+    """, rundir="out", outfile="showtraceout.txt")
+
+contains("out/showtraceout.txt",
+        "timid coverage.collector.PyTracer",
+        "regular coverage.collector.PyTracer"
+        )
+
+if old_opts:
+    os.environ['COVERAGE_OPTIONS'] = old_opts
+else:
+    del os.environ['COVERAGE_OPTIONS']
+
+clean("out")
diff --git a/test/farm/run/src/showtrace.py b/test/farm/run/src/showtrace.py
new file mode 100644
index 00000000..49e212e8
--- /dev/null
+++ b/test/farm/run/src/showtrace.py
@@ -0,0 +1,15 @@
+# Show the current frame's trace function, so that we can test what the
+# command-line options do to the trace function used.
+
+import sys
+
+# Print the argument as a label for the output.
+print sys.argv[1],
+
+# Show what the trace function is.  If a C-based function is used, then f_trace
+# is None.
+trace_fn = sys._getframe(0).f_trace
+if trace_fn is None:
+    print "None"
+else:
+    print trace_fn.im_class