Turn feature test into a proper unit test

test cases/fortran/7 generated/meson.build

@@ -4,15 +4,19 @@
 project('generated', 'fortran')
 
 conf_data = configuration_data()
+conf_data.set('ONE', 1)
+conf_data.set('TWO', 2)
 
-sources_fortran_basenames = ['mod2', 'mod1']
-preproc_sources_fortran = []
-foreach fsource_basename : sources_fortran_basenames
-  infilename = '@0@.fpp'.format(fsource_basename)
-  outfilename = '@0@.f90'.format(fsource_basename)
+templates_basenames = ['mod2', 'mod1']
+generated_sources = []
+foreach template_basename : templates_basenames
+  infilename = '@0@.fpp'.format(template_basename)
+  outfilename = '@0@.f90'.format(template_basename)
   outfile = configure_file(
       input : infilename, output : outfilename, configuration : conf_data)
-  preproc_sources_fortran += [outfile]
+  generated_sources += [outfile]
 endforeach
 
-mylib = static_library('mylib', preproc_sources_fortran)
+sources = ['prog.f90'] + generated_sources
+exe = executable('generated', sources)
+test('generated', exe)

test cases/fortran/7 generated/mod1.fpp

@@ -1,6 +1,6 @@
 module mod1
   implicit none
 
-  integer, parameter :: modval1 = 1
+  integer, parameter :: modval1 = @ONE@
 
 end module mod1

test cases/fortran/7 generated/mod2.fpp

@@ -2,6 +2,6 @@ module mod2
   use mod1
   implicit none
 
-  integer, parameter :: modval2 = 2
+  integer, parameter :: modval2 = @TWO@
 
 end module mod2

test cases/fortran/7 generated/prog.f90

@@ -0,0 +1,9 @@
+program prog
+  use mod2
+  implicit none
+
+  if (modval1 + modval2 /= 3) then
+    stop 1
+  end if
+
+end program prog