Implement pdf renderer side of tess spoof

tests/spoof/tesseract_noop.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python3
 import sys
+import img2pdf
 
 
 VERSION_STRING = '''tesseract 3.04.00
@@ -42,6 +43,12 @@ def main():
         output = sys.argv[-2]
         with open(output + '.hocr', 'w', encoding='utf-8') as f:
             f.write(HOCR_TEMPLATE.format('1000', '1000'))
+    elif sys.argv[-1] == 'pdf':
+        inputf = sys.argv[-3]
+        output = sys.argv[-2]
+        pdf_bytes = img2pdf.convert([inputf], dpi=300)
+        with open(output + '.pdf', 'wb') as f:
+            f.write(pdf_bytes)
     else:
         print("Spoof doesn't understand arguments", file=sys.stderr)
         print(sys.argv, file=sys.stderr)

tests/test_main.py

@@ -83,18 +83,18 @@ def test_quick():
 
 
 @pytest.fixture
-def spoof_tesseract_hocr_empty():
+def spoof_tesseract_noop():
     env = os.environ.copy()
-    program = os.path.join(SPOOF_PATH, 'tesseract_hocr_empty.py')
+    program = os.path.join(SPOOF_PATH, 'tesseract_noop.py')
     check_call(['chmod', "+x", program])
     env['OCRMYPDF_TESSERACT'] = program
     return env
 
 
-def test_deskew(spoof_tesseract_hocr_empty):
+def test_deskew(spoof_tesseract_noop):
     # Run with deskew
     deskewed_pdf = check_ocrmypdf(
-        'skew.pdf', 'test_deskew.pdf', '-d', env=spoof_tesseract_hocr_empty)
+        'skew.pdf', 'test_deskew.pdf', '-d', env=spoof_tesseract_noop)
 
     # Now render as an image again and use Leptonica to find the skew angle
     # to confirm that it was deskewed