com.google.fonts/check/missing_small_caps_glyphs ERROR Failed with AttributeError: mapping

[weiweihuanghuang]

I ran make test on my font here and got this error:

 >> Check:   com.google.fonts/check/missing_small_caps_glyphs
    Desc:    Check small caps glyphs are available.
    Files:   FragmentMono-Italic.ttf

    ERROR Failed with AttributeError: mapping                                   
          ↳ File                                                                
          "/Users/weihuang/type-build-projects/fragment-mono/venv/lib/python3.10
          /site-packages/fontbakery/checkrunner.py", line 194, in _exec_check   
          for sub_result in result:  # Might raise.                             
          ↳ File                                                                
          "/Users/weihuang/type-build-projects/fragment-mono/venv/lib/python3.10
          /site-packages/fontbakery/profiles/googlefonts.py", line 5728, in     
          com_google_fonts_check_missing_small_caps_glyphs                      
          smcp_glyphs = set(subtable.mapping.values())                          
          ↳ File                                                                
          "/Users/weihuang/type-build-projects/fragment-mono/venv/lib/python3.10
          /site-packages/fontTools/ttLib/tables/otBase.py", line 817, in getattr
          raise AttributeError(attr)                                            
    Result: ERROR

I'm not sure what it means. I have smallcaps glyphs in 'a.sc' format.

[weiweihuanghuang]

Just following up, it's unclear what the 'mapping' error means? Is there a certain format that smallcaps glyph names have to conform to?

[kalapi]

Hello! I get the following error during my test:

Failed with TypeError: unhashable type: 'list'                        
          ↳ File                                                                
          "/Users/UT-development/Documents/_Programming/testing_environments/FMa
          ke37/lib/python3.8/site-packages/fontbakery/checkrunner.py", line 183,
          in _exec_check                                                        
          for sub_result in result:  # Might raise.                             
          ↳ File                                                                
          "/Users/UT-development/Documents/_Programming/testing_environments/FMa
          ke37/lib/python3.8/site-packages/fontbakery/profiles/googlefonts.py", 
          line 6558, in com_google_fonts_check_missing_small_caps_glyphs        
          smcp_glyphs = set(subtable.mapping.values()) 

This is because in my c2sc code I use a one-to-many type substitution for the titlecase chars Dž, Lj, and Nj like so:

lookup LAT_dflt_smcp_Mixed {
	sub Dzcaron by d.sc zcaron.sc;
	sub Lj by l.sc j.alt.sc;
	sub Nj by n.sc j.alt.sc;
} LAT_dflt_smcp_Mixed;

The test is designed to check only one-to-one sub. rules, which I understand and i'm probably over-engineering. I fixed the error by reverting to one-to-one type subs. because the distributor we work with were keen on us fixing it.