Move the warnings to get them in more cases, and test one of those cases.

2 files changed, 18 insertions, 1 deletions

diff --git a/test/backtest.py b/test/backtest.py
index 05a1e142..e8d8366d 100644
--- a/test/backtest.py
+++ b/test/backtest.py
@@ -18,6 +18,7 @@ except ImportError:
         """
         _, stdouterr = os.popen4(cmd)
         return status, stdouterr.read()
+
 else:
     def run_command(cmd, status=0):
         """Run a command in a subprocess.
@@ -25,7 +26,6 @@ else:
         Returns the exit status code and the combined stdout and stderr.
 
         """
-
         proc = subprocess.Popen(cmd, shell=True,
                 stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                 stderr=subprocess.STDOUT
diff --git a/test/test_process.py b/test/test_process.py
index d59d0726..684a5de0 100644
--- a/test/test_process.py
+++ b/test/test_process.py
@@ -243,3 +243,20 @@ class ProcessTest(CoverageTest):
             data = coverage.CoverageData()
             data.read_file(".coverage")
             self.assertEqual(data.summary()['fork.py'], 9)
+
+    def test_warnings(self):
+        self.make_file("hello.py", """\
+            import sys, os
+            print("Hello")
+            """)
+        out = self.run_command("coverage run --source=sys,xyzzy hello.py")
+
+        # This output is not in the same order it appears in real command line
+        # output, but this is how it appears in the combined stdout/stderr that
+        # run_command gives us.
+        self.assertMultiLineEqual(out, textwrap.dedent("""\
+            Hello
+            Coverage.py warning: Module sys has no python source.
+            Coverage.py warning: Source module xyzzy was never encountered.
+            Coverage.py warning: No data was collected.
+            """))