test: remove test code that support tess3 or tess4 testing

tests/test_tess4.py

@@ -27,85 +27,17 @@ from ocrmypdf.exceptions import MissingDependencyError
 from ocrmypdf.exec import tesseract
 
 # pylint: disable=no-member,w0621
-spoof = pytest.helpers.spoof
-
-
-def _ensure_tess4():
-    if tesseract.v4():
-        # "tesseract" on $PATH is already v4
-        return os.environ.copy()
-
-    if os.environ.get('OCRMYPDF_TESS4'):
-        # OCRMYPDF_TESS4 is a hint environment variable that tells us to look
-        # somewhere special for tess4 if and only if we need it. This allows
-        # setting OCRMYPDF_TESS4 to test tess4 and PATH to point to tess3
-        # on a system with both installed.
-        env = os.environ.copy()
-        tess4 = Path(os.environ['OCRMYPDF_TESS4'])
-        assert tess4.is_file()
-        env['PATH'] = tess4.parent + ':' + env['PATH']
-        env['OCRMYPDF_TESS4'] = os.environ['OCRMYPDF_TESS4']
-        return env
-
-    raise EnvironmentError("Can't find Tesseract 4")
-
-
-@pytest.fixture
-def ensure_tess4():
-    return _ensure_tess4()
-
-
-@contextmanager
-def modified_os_environ(env):
-    old_env = os.environ.copy()
-    os.environ.update(env)
-    yield
-    for key in env:
-        del os.environ[key]
-        if key in old_env:
-            os.environ[key] = old_env[key]
-
-
-def tess4_available():
-    """Check if a tesseract 4 binary is available, even if it's not the
-    official "tesseract" on PATH
-
-    """
-    try:
-        # _ensure_tess4 locates the tess4 binary we are going to check
-        env = _ensure_tess4()
-        with modified_os_environ(env):
-            # Now jump into this environment and make sure it really is Tess4
-            return tesseract.v4() and tesseract.has_textonly_pdf()
-    except EnvironmentError:
-        pass
-
-    return False
-
-
-# Skip all tests in this file if not tesseract 4
-pytestmark = pytest.mark.skipif(
-    not tess4_available(), reason="tesseract 4.0 with textonly_pdf feature required"
-)
 
 check_ocrmypdf = pytest.helpers.check_ocrmypdf
 run_ocrmypdf = pytest.helpers.run_ocrmypdf
 spoof = pytest.helpers.spoof
 
 
-def test_textonly_pdf(ensure_tess4, resources, outdir):
-    check_ocrmypdf(
-        resources / 'linn.pdf',
-        outdir / 'linn_textonly.pdf',
-        '--pdf-renderer',
-        'sandwich',
-        '--sidecar',
-        outdir / 'foo.txt',
-        env=ensure_tess4,
-    )
+def test_tesseract_v4():
+    assert tesseract.v4()
 
 
-def test_pagesize_consistency_tess4(ensure_tess4, resources, outpdf):
+def test_pagesize_consistency_tess4(resources, outpdf):
     from math import isclose
 
     infile = resources / 'linn.pdf'
@@ -121,7 +53,6 @@ def test_pagesize_consistency_tess4(ensure_tess4, resources, outpdf):
         '--deskew',
         '--remove-background',
         '--clean-final' if pytest.helpers.have_unpaper() else None,
-        env=ensure_tess4,
     )
 
     after_dims = pytest.helpers.first_page_dimensions(outpdf)
@@ -131,7 +62,7 @@ def test_pagesize_consistency_tess4(ensure_tess4, resources, outpdf):
 
 
 @pytest.mark.parametrize('basename', ['graph_ocred.pdf', 'cardinal.pdf'])
-def test_skip_pages_does_not_replicate(ensure_tess4, resources, basename, outdir):
+def test_skip_pages_does_not_replicate(resources, basename, outdir):
     infile = resources / basename
     outpdf = outdir / basename
 
@@ -143,7 +74,6 @@ def test_skip_pages_does_not_replicate(ensure_tess4, resources, basename, outdir
         '--force-ocr',
         '--tesseract-timeout',
         '0',
-        env=ensure_tess4,
     )
 
     info_in = pdfinfo.PdfInfo(infile)
@@ -156,17 +86,11 @@ def test_skip_pages_does_not_replicate(ensure_tess4, resources, basename, outdir
         assert info[n].width_inches == info_in[n].width_inches
 
 
-def test_content_preservation(ensure_tess4, resources, outpdf):
+def test_content_preservation(resources, outpdf):
     infile = resources / 'masks.pdf'
 
     check_ocrmypdf(
-        infile,
-        outpdf,
-        '--pdf-renderer',
-        'sandwich',
-        '--tesseract-timeout',
-        '0',
-        env=ensure_tess4,
+        infile, outpdf, '--pdf-renderer', 'sandwich', '--tesseract-timeout', '0'
     )
 
     info = pdfinfo.PdfInfo(outpdf)
@@ -174,12 +98,10 @@ def test_content_preservation(ensure_tess4, resources, outpdf):
     assert len(page.images) > 1, "masks were rasterized"
 
 
-def test_no_languages(ensure_tess4, tmp_path):
-    env = ensure_tess4
+def test_no_languages(tmp_path):
+    env = os.environ.copy()
     (tmp_path / 'tessdata').mkdir()
     env['TESSDATA_PREFIX'] = fspath(tmp_path)
 
-    with modified_os_environ(env):
-        with pytest.raises(MissingDependencyError):
-            tesseract.languages.cache_clear()
-            tesseract.languages()
+    with pytest.raises(MissingDependencyError):
+        tesseract.languages(tesseract_env=env)