[gparted] Test that PipeCapture clears capture buffer before it starts (#777973)

[Curtis Gedak <gedakc src gnome org>]

commit 03c2be9b90e996efaab9663a1e6aa0c7df30be42
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Thu May 25 07:08:14 2017 +0100

    Test that PipeCapture clears capture buffer before it starts (#777973)
    
    Initialise capture string with sacrificial text before each test.
    Existing tests confirm this is cleared first by checking the captured
    string matches the input string.
    
    Bug 777973 - Segmentation fault on bad disk

 tests/test_PipeCapture.cc |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/tests/test_PipeCapture.cc b/tests/test_PipeCapture.cc
index ddced6c..332b38d 100644
--- a/tests/test_PipeCapture.cc
+++ b/tests/test_PipeCapture.cc
@@ -142,7 +142,8 @@ std::string BinaryStringToPrint( size_t offset, const char * s, size_t len )
 class PipeCaptureTest : public ::testing::Test
 {
 protected:
-       PipeCaptureTest() : eof_signalled( false ), update_signalled( 0U )  {};
+       PipeCaptureTest() : capturedstr( "text to be replaced" ),
+                           eof_signalled( false ), update_signalled( 0U )  {};
 
        virtual void SetUp();
        virtual void TearDown();