ENH: Tests: Test that we have added /ActualText with RTL appearance streams

Author: PJBrs

tests/test_appearance_stream.py

@@ -66,7 +66,8 @@ def test_scale_text():
 
     layout.rectangle = (0, 0, 160, 360)
     font_size = 0.0
-    text = """Welcome to pypdf
+    text = """Welcome to pypdf!
+أهلاً بكم في pypdf!
 pypdf is a free and open source pure-python PDF library capable of splitting, merging, cropping, and
 transforming the pages of PDF files. It can also add custom data, viewing options, and passwords to PDF
 files. pypdf can retrieve text and metadata from PDFs as well.
@@ -79,12 +80,13 @@ def test_scale_text():
     )
     assert b"12 Tf" in appearance_stream.get_data()
     assert b"pypdf is a free and open" in appearance_stream.get_data()
+    assert b"/Span << /ActualText" in appearance_stream.get_data()
 
     layout.rectangle = (0, 0, 160, 160)
     appearance_stream = TextStreamAppearance(
         layout=layout, text=text, font_size=font_size, is_multiline=is_multiline
     )
-    assert b"9.8 Tf" in appearance_stream.get_data()
+    assert b"9.6 Tf" in appearance_stream.get_data()
 
     layout.rectangle = (0, 0, 160, 12)
     appearance_stream = TextStreamAppearance(
@@ -142,7 +144,12 @@ def test_appearance_stream_rtl():
         font_color="0 g",
         is_multiline=False
     )
-    hex_glyphs_rtl_enabled = re.findall("<(.+?)>", appearance.get_data().decode())[0]
+    # The regex returns two groups. The first matches the text in /Span << /ActualText <[group 0]> >> BDC
+    # The second matches the encoded text data.
+    decoded_data = re.findall("<([a-zA-Z0-9]+?)> ", appearance.get_data().decode())
+    actual_text = bytes.fromhex(decoded_data[0]).decode("utf-16-be")
+    assert actual_text == "\ufeff" + test_string
+    hex_glyphs_rtl_enabled = decoded_data[1]
     assert hex_shaped_test_glyphs == hex_glyphs_rtl_enabled
 
     # RTL support disabled
@@ -157,7 +164,7 @@ def test_appearance_stream_rtl():
             font_color="0 g",
             is_multiline=False
         )
-        hex_glyphs_rtl_disabled = re.findall("<(.+?)>", appearance.get_data().decode())[0]
+        hex_glyphs_rtl_disabled = re.findall("<(.+?)>", appearance.get_data().decode())[1]
     assert hex_unshaped_test_glyphs == hex_glyphs_rtl_disabled
     # The hex glyph sequences should be different when RTL support is enabled vs disabled
     assert hex_glyphs_rtl_enabled != hex_glyphs_rtl_disabled