integrate python tests

Add parts to configure.ac and Makefile.am. There is now an additional
flag --enable-python-tests. The tests require the pytest package.

The implementation of the test is a bit hacky because it takes
wrapper.so from .libs. This should probably improbed for better
portability.

Makefile.am

@@ -629,6 +629,18 @@ wrapper_la_CFLAGS = $(PYTHON_INCLUDE) $(NUMPY_INCLUDE) $(AM_CFLAGS)
 python/pyelpa/wrapper.c: python/pyelpa/wrapper.pyx
 	cython $<
 
+if WITH_PYTHON_TESTS
+check_SCRIPTS += check_python.sh
+endif
+
+check_python.sh:
+	@echo "#!/bin/bash" > $@
+	@echo "export PYTHONPATH=$$PYTHONPATH:$(top_srcdir)/python" >> $@
+# this is very hacky... is there a better way to get wrapper.so?
+	@echo "cp $(top_srcdir)/.libs/wrapper.so $(top_srcdir)/python" >> $@
+	@echo "pytest $(top_srcdir)/python" >> $@
+	@echo "rm $(top_srcdir)/python/wrapper.so" >> $@
+	@chmod +x $@
 
 # test scripts
 TASKS ?= 2
@@ -668,7 +680,8 @@ CLEANFILES = \
   complex* \
   double_instance* \
   *.i \
-  python/pyelpa/wrapper.c
+  python/pyelpa/wrapper.c \
+  check_python.sh
 
 clean-local:
 	-rm -rf modules/* private_modules/* test_modules/* .fortran_dependencies/*

configure.ac

@@ -1326,6 +1326,29 @@ if test x"${enable_python}" = x"yes"; then
         AS_IF([test "$NUMPY_INCLUDE" = "-I"], [AC_MSG_ERROR([cannot get numpy include path.])])
         AC_MSG_RESULT([$NUMPY_INCLUDE])
 fi
+AC_MSG_CHECKING(whether --enable-python-tests is specified)
+AC_ARG_ENABLE([python-tests],
+              AS_HELP_STRING([--enable-python-tests],
+                             [enable python tests, default no.]),
+              [
+	       if test x"$enableval" = x"yes"; then
+	         enable_python_tests=yes
+	       else
+	         enable_python_tests=no
+	       fi
+	       ],
+              [enable_python_tests=no])
+AC_MSG_RESULT([${enable_python_tests}])
+AM_CONDITIONAL([WITH_PYTHON_TESTS],[test x"$enable_python_tests" = x"yes"])
+if test x"${enable_python_tests}" = x"yes"; then
+        if test x"${enable_python}" = x"no"; then
+          AC_MSG_ERROR([Python tests can only be enabled it python is enabled.])
+        fi
+        AC_CHECK_PROG([pytest_found], [pytest], [yes], [no])
+        if test x"$pytest_found" != x"yes" ; then
+          AC_MSG_ERROR([pytest not found.])
+        fi
+fi
 
 
 AC_OUTPUT