tests: fix problems with ghostscript spoofers

tests/spoof/gs_raster_failure.py

@@ -35,13 +35,13 @@ def main():
         print('SPOOFED: ' + os.path.basename(__file__))
         sys.exit(0)
 
-    # For any rendering calls (device == pdfwrite) call real ghostscript
-    if '-sDEVICE=pdfwrite' in sys.argv:
+    # For non-image rastering calls, use real ghostscript
+    if '-sDEVICE=pdfwrite' in sys.argv or '-sDEVICE=txtwrite' in sys.argv:
         real_ghostscript(sys.argv)
         return
 
     # Fail
-    print("ERROR: Ghost story archive not found")
+    print("ERROR: Ghost story archive not found", file=sys.stderr)
     sys.exit(1)
 
 

tests/spoof/gs_render_failure.py

@@ -40,7 +40,7 @@ def main():
         return
 
     # Fail
-    print("ERROR: Casper is not a friendly ghost")
+    print("ERROR: Casper is not a friendly ghost", file=sys.stderr)
     sys.exit(1)
 
 

tests/test_ghostscript.py

@@ -119,7 +119,7 @@ def test_gs_render_failure(spoof_no_tess_gs_render_fail, resources, outpdf):
     p, out, err = run_ocrmypdf(
         resources / 'blank.pdf', outpdf, env=spoof_no_tess_gs_render_fail
     )
-    print(err)
+    assert 'Casper is not a friendly ghost' in err
     assert p.returncode == ExitCode.child_process_error
 
 
@@ -127,7 +127,7 @@ def test_gs_raster_failure(spoof_no_tess_gs_raster_fail, resources, outpdf):
     p, out, err = run_ocrmypdf(
         resources / 'ccitt.pdf', outpdf, env=spoof_no_tess_gs_raster_fail
     )
-    print(err)
+    assert 'Ghost story archive not found' in err
     assert p.returncode == ExitCode.child_process_error