Add XClib unit tests.

XClib/CMakeLists.txt

@@ -63,5 +63,15 @@ if(QE_ENABLE_TEST)
             qe_mpi_fortran
             qe_external_libxc
             qe_xclib)
-    #add_test(NAME test_qe_xclib COMMAND $<TARGET_FILE:qe_xclib_test>)
+
+    find_program(BASH_PROGRAM bash)
+
+    file(GLOB test_input_file_names
+         RELATIVE ${CMAKE_CURRENT_SOURCE_DIR}/test_input_files
+         test_input_files/*.in)
+
+    foreach(test_input_file IN LISTS test_input_file_names)
+      string(REGEX REPLACE ".in$" "" test_input_file_name_no_extension ${test_input_file})
+      add_test(NAME test_qe_xclib_${test_input_file_name_no_extension} COMMAND ${BASH_PROGRAM} -c "$<TARGET_FILE:qe_xclib_test> < ${CMAKE_CURRENT_SOURCE_DIR}/test_input_files/${test_input_file}")
+    endforeach()
 endif(QE_ENABLE_TEST)

XClib/test_input_files/dft-comparison.in

@@ -0,0 +1,8 @@
+&INPUT_NAMELIST
+   test='dft-comparison',
+   nspin=2,
+   family='LDA',
+   DF_OK=.FALSE.,
+   dft1='sla pz',
+   dft2='lda_x lda_c_pz'
+/

XClib/test_input_files/dft-info.in

@@ -0,0 +1,4 @@
+&INPUT_NAMELIST
+    test='dft-info'
+    dft1='mgga_x_scan mgga_c_scan'
+/