src/__init__.py tests/conftest.py: check no calls to log() when runni…

…ng tests.

Also changed exception_info() to call log() instead of writing directly to
_g_out_log, so that exception backtraces are also checked.

src/__init__.py

@@ -61,6 +61,8 @@ def _set_stream(name, default):
 _g_out_log = _set_stream('PYMUPDF_LOG', sys.stdout)
 _g_out_message = _set_stream('PYMUPDF_MESSAGE', sys.stdout)
 
+# Set to list() if we are in test suite.
+_g_log_items = None
 
 def log( text='', caller=1):
     '''
@@ -70,7 +72,10 @@ def log( text='', caller=1):
     filename    = os.path.relpath(frame_record.filename)
     line        = frame_record.lineno
     function    = frame_record.function
-    print( f'{filename}:{line}:{function}: {text}', file=_g_out_log)
+    text = f'{filename}:{line}:{function}: {text}'
+    if _g_log_items is not None:
+        _g_log_items.append(text)
+    print(text, file=_g_out_log)
     _g_out_log.flush()
 
 
@@ -85,7 +90,7 @@ def message(text=''):
 def exception_info():
     import traceback
     log(f'exception_info:')
-    traceback.print_exc(file=_g_out_log)
+    log(traceback.format_exc())
 
 
 # PDF names must not contain these characters:

tests/conftest.py

@@ -12,6 +12,8 @@ def wrap(*args, **kwargs):
     assert not wt, f'{wt=}'
     assert not pymupdf.TOOLS.set_small_glyph_heights()
 
+    pymupdf._g_log_items = list()
+
     # Run the test.
     rep = yield
 
@@ -23,3 +25,5 @@ def wrap(*args, **kwargs):
         assert not wt, f'Warnings text not empty: {wt=}'
 
     assert not pymupdf.TOOLS.set_small_glyph_heights()
+
+    assert not pymupdf._g_log_items, f'log() was called; {len(pymupdf._g_log_items)=}.'