add unit test for a simple CXX project

.gitignore

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+*.pyc
+__pycache__/
+
+# generated by unit tests
+test/*/CMakeLists.txt
+test/*/build/
+test/*/cmake/bootstrap.py*
+test/*/cmake/lib/
+test/*/cmake/modules/
+test/*/setup.py

test/cxx/cmake/autocmake.cfg

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+[project]
+name: example
+
+[cxx]
+source: https://github.com/scisoft/autocmake/raw/master/modules/UseCXX.cmake
+docopt: --cxx=<CXX> C++ compiler [default: g++].
+export: 'CXX=%s' % arguments['--cxx']
+
+[custom]
+source: custom/custom.cmake

test/cxx/cmake/custom/custom.cmake

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+add_executable(example example.cpp)

test/cxx/example.cpp

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+#include <iostream>
+
+int main()
+{
+    std::cout << "Hello World!";
+    return 0;
+}

test/test.py

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+import os
+import subprocess
+
+HERE = os.path.abspath(os.path.dirname(__file__))
+
+#-------------------------------------------------------------------------------
+
+def exe(command):
+    stdout, stderr = subprocess.Popen(command.split(),
+                                      stdout=subprocess.PIPE,
+                                      stderr=subprocess.PIPE).communicate()
+    return stdout, stderr
+
+#-------------------------------------------------------------------------------
+
+def test_cxx():
+    os.chdir(os.path.join(HERE, 'cxx', 'cmake'))
+    stdout, stderr = exe('wget https://github.com/scisoft/autocmake/raw/master/bootstrap.py')
+    stdout, stderr = exe('python bootstrap.py --init')
+    stdout, stderr = exe('python bootstrap.py ..')
+    os.chdir(os.path.join(HERE, 'cxx'))
+    stdout, stderr = exe('python setup.py --cxx=g++')
+    os.chdir(os.path.join(HERE, 'cxx', 'build'))
+    stdout, stderr = exe('make')
+    stdout, stderr = exe('./example')
+    assert 'Hello World!' in stdout