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MemoryOutStream derives from std::ostringstream. The later does not have a default (no argument) constructor before C++11. Apparently the single argument constructor with a default value does not count (didn't look into the standard, but that's what's GCC Version 5.4.0 says. Clang 7.0.0 seems to disagree, however).
Therefore later in GetText() when it calls this->str() I get a segmentation fault:
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff711c446 in std::string::assign(std::string const&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#0 0x00007ffff711c446 in std::string::assign(std::string const&) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#1 0x000000000046d18a in UnitTest::MemoryOutStream::GetText() const ()
#2 0x0000000000441131 in UnitTest::CheckClose<float, double, double> (results=..., expected=@0x7fffffffcb44: 1.00022995, actual=@0x7fffffffcb48: 1, tolerance=@0x7fffffffcb50: 0.0001, details=...) at /usr/include/unittest++/Checks.h:53
... more, but not relevant here
This was running in a Travis CI build on a Ubuntu 16.04.6 LTS, unittest++ used via apt-get:
Selecting previously unselected package libunittest++-dev.
Preparing to unpack .../libunittest++-dev_1.4.0-3_amd64.deb ...
Unpacking libunittest++-dev (1.4.0-3) ..
Suggested solution: Just call the base constructor without any arguments.
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