Add a single test project and set to build on travis/appveyor

.travis.yml

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+matrix:
+  include:
+    - sudo: required
+      services:
+        - docker
+    - os: osx
+
+script:
+  - pip install .
+  - python ./run_tests.py

appveyor.yml

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+build_script:
+  - pip install .
+  - python ./run_tests.py

run_tests.py

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+from __future__ import print_function
+import os, sys, subprocess
+from glob import glob
+
+# move cwd to the project root
+os.chdir(os.path.dirname(os.path.abspath(__file__)))
+
+test_projects = glob('test/??_*')
+
+if len(test_projects) == 0:
+    print('No test projects found. Aborting.', file=sys.stderr)
+    exit(2)
+
+print('Testing projects:', test_projects)
+
+for project_path in test_projects:
+    subprocess.check_call(['cibuildwheel', project_path])
+    print('%s built successfully.' % project_path)
+
+print('%d projects built successfully.' % len(test_projects))

test/01_basic/setup.py

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+from setuptools import setup, Extension
+
+setup(
+    name="spam",
+    ext_modules=[Extension('spam', sources=['spam.c'])],
+    version="0.1.0",
+)

test/01_basic/spam.c

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+#include <Python.h>
+
+static PyObject *
+spam_system(PyObject *self, PyObject *args)
+{
+    const char *command;
+    int sts;
+
+    if (!PyArg_ParseTuple(args, "s", &command))
+        return NULL;
+    sts = system(command);
+    return PyLong_FromLong(sts);
+}
+
+/* Module initialization */
+
+#if PY_MAJOR_VERSION >= 3
+    #define MOD_INIT(name) PyMODINIT_FUNC PyInit_##name(void)
+    #define MOD_DEF(m, name, doc, methods, module_state_size) \
+        static struct PyModuleDef moduledef = { \
+            PyModuleDef_HEAD_INIT, name, doc, module_state_size, methods, }; \
+        m = PyModule_Create(&moduledef);
+    #define MOD_RETURN(m) return m;
+#else
+    #define MOD_INIT(name) PyMODINIT_FUNC init##name(void)
+    #define MOD_DEF(m, name, doc, methods, module_state_size) \
+        m = Py_InitModule3(name, methods, doc);
+    #define MOD_RETURN(m) return;
+#endif
+
+static PyMethodDef module_methods[] = {
+    {"system", (PyCFunction)spam_system, METH_VARARGS, 
+     "Execute a shell command."},
+    {NULL}  /* Sentinel */
+};
+
+MOD_INIT(pyinstrument_cext)
+{
+    PyObject* m;
+
+    MOD_DEF(m, 
+            "spam", 
+            "Example module", 
+            module_methods,
+            -1)
+
+    MOD_RETURN(m)
+}

test/README.md

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+This folder contains repos that are built by cibuildwheel to test cibuildwheel. Confusing, I know.
+
+Basically, if cibuildwheel can build these projects, we're good.