[gparted] Add 1 MiB ASCII PipeCapture test (#777973)

[Curtis Gedak <gedakc src gnome org>]

commit eb2d571a6c5c8d5108e5dd2a7e7bf3f1c913cb35
Author: Mike Fleetwood <mike fleetwood googlemail com>
Date:   Sun May 21 10:52:01 2017 +0100

    Add 1 MiB ASCII PipeCapture test (#777973)
    
    Add test sending 1 MiB of ASCII test into PipeCapture to read.  This
    requires multiple reads and rewites through the pipe.
    
    This is as much a check of the threading in the PipeCaptureTest class as
    it is of PipeCapture itself.  This is because a single thread might
    block reading from a pipe waiting for itself to write to the pipe.
    Deadlock.  Hence the requirement to use a separate thread for reading
    and writing.
    
    Bug 777973 - Segmentation fault on bad disk

 tests/test_PipeCapture.cc |   21 +++++++++++++++++++++
 1 files changed, 21 insertions(+), 0 deletions(-)
---
diff --git a/tests/test_PipeCapture.cc b/tests/test_PipeCapture.cc
index 05ede91..7b49649 100644
--- a/tests/test_PipeCapture.cc
+++ b/tests/test_PipeCapture.cc
@@ -37,6 +37,15 @@
 namespace GParted
 {
 
+// Repeat a C++ string count times, where count >= 0.
+static std::string repeat( const std::string & str, size_t count )
+{
+       std::string result = "";
+       while ( count -- > 0 )
+               result += str;
+       return result;
+}
+
 // Explicit test fixture class with common variables and methods used in each test.
 // Reference:
 //     Google Test, Primer, Test Fixtures: Using the Same Data Configuration for Multiple Tests
@@ -159,6 +168,18 @@ TEST_F( PipeCaptureTest, ShortASCIIText )
        EXPECT_TRUE( eof_signalled );
 }
 
+TEST_F( PipeCaptureTest, LongASCIIText )
+{
+       // Test capturing 1 MiB of ASCII text (requiring multiple reads in PipeCapture).
+       inputstr = repeat( "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_\n", 16384 );
+       PipeCapture pc( pipefds[ReaderFD], capturedstr );
+       pc.signal_eof.connect( sigc::mem_fun( *this, &PipeCaptureTest::eof_callback ) );
+       pc.connect_signal();
+       run_writer_thread();
+       EXPECT_STREQ( inputstr.c_str(), capturedstr.c_str() );
+       EXPECT_TRUE( eof_signalled );
+}
+
 }  // namespace GParted
 
 // Custom Google Test main() which also initialises the Glib threading system for