coverage: test compile leptonica

src/ocrmypdf/lib/compile_leptonica.py

@@ -19,7 +19,6 @@
 from cffi import FFI
 
 ffibuilder = FFI()
-ffibuilder.set_source("ocrmypdf.lib._leptonica", None)
 ffibuilder.cdef("""
 typedef signed char             l_int8;
 typedef unsigned char           l_uint8;
@@ -324,5 +323,7 @@ lept_free(void *ptr);
 """)
 
 
+ffibuilder.set_source("ocrmypdf.lib._leptonica", None)
+
 if __name__ == '__main__':
     ffibuilder.compile(verbose=True)

tests/test_lept.py

@@ -78,3 +78,12 @@ def test_pickle(crom_pix):
     pickled = dumps(pix)
     pix2 = loads(pickled)
     assert pix.mode == pix2.mode
+
+
+def test_leptonica_compile(tmpdir):
+    from ocrmypdf.lib.compile_leptonica import ffibuilder
+
+    # Compile the library but build it somewhere that won't interfere with
+    # existing compiled library. Also compile in API mode so that we test
+    # the interfaces, even though we use it ABI mode.
+    ffibuilder.compile(tmpdir=tmpdir, target=(tmpdir /'lepttest.*'))