[gstreamermm] Tests: fix test run in parallel mode

[Marcin Kolny <mkolny src gnome org>]

commit f27bf4cb5ff218eca236c62807267cfa78582761
Author: Marcin Kolny <marcin kolny gmail com>
Date:   Tue Sep 27 21:40:19 2016 +0200

    Tests: fix test run in parallel mode

 tests/regression/test-regression-rewritefile.cc   |    4 ++--
 tests/regression/test-regression-seekonstartup.cc |    2 +-
 tests/regression/test-regression-videoduration.cc |    2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/tests/regression/test-regression-rewritefile.cc b/tests/regression/test-regression-rewritefile.cc
index 7d577be..964fcda 100644
--- a/tests/regression/test-regression-rewritefile.cc
+++ b/tests/regression/test-regression-rewritefile.cc
@@ -35,8 +35,8 @@ bool on_bus_message(const RefPtr<Bus>&, const Glib::RefPtr<Message>& message)
 
 TEST(RegressionRewriteFileTest, CreateAndRewriteFile)
 {
-  Glib::ustring input_filename = "test.ogg",
-          output_filename = "output.ogg";
+  Glib::ustring input_filename = "rewrite-file-test.ogg",
+          output_filename = "rewrite-file-output.ogg";
 
   GenerateSampleOggFile(20, input_filename);
 
diff --git a/tests/regression/test-regression-seekonstartup.cc 
b/tests/regression/test-regression-seekonstartup.cc
index a93b0a4..f44dae7 100644
--- a/tests/regression/test-regression-seekonstartup.cc
+++ b/tests/regression/test-regression-seekonstartup.cc
@@ -108,7 +108,7 @@ void no_more_pads()
 
 TEST(RegressionSeekOnStartupTest, SeekToPositionWhenPipelineStarts)
 {
-  Glib::ustring input_filename = "test.ogg";
+  Glib::ustring input_filename = "seek-on-startup-test.ogg";
 
   GenerateSampleOggFile(100, input_filename);
 
diff --git a/tests/regression/test-regression-videoduration.cc 
b/tests/regression/test-regression-videoduration.cc
index 0e9a254..d8621b5 100644
--- a/tests/regression/test-regression-videoduration.cc
+++ b/tests/regression/test-regression-videoduration.cc
@@ -59,7 +59,7 @@ bool on_timeout()
 
 TEST(RegressionVideodurationTest, CreateVideoAndCheckDuration)
 {
-  Glib::ustring input_filename = "test.ogg";
+  Glib::ustring input_filename = "videoduration-test.ogg";
 
   GenerateSampleOggFile(10, input_filename);