Write to file and file-like objects

[EnricoMi]

Method fromfile already supports reading file objects, file-like objects and urls. This is now tested and documented.

Similarly, methods write_xml and write now support writing to file objects and file-like objects. This makes to_console argument redundant.

Asserts the actual written XML content.

[github-actions]

Test Results

  4 files  ± 0    4 suites  ±0   1s ⏱️ -1s
101 tests + 5  101 ✅ + 5  0 💤 ±0  0 ❌ ±0 
404 runs  +20  395 ✅ +17  9 💤 +3  0 ❌ ±0 

Results for commit 1e246e4. ± Comparison against base commit 260ef3d.

This pull request removes 6 and adds 11 tests. Note that renamed tests count towards both.

tests.test_fromfile ‑ test_read_written_xml
tests.test_fromfile ‑ test_write
tests.test_fromfile ‑ test_write_noarg
tests.test_fromfile ‑ test_write_nonascii
tests.test_fromfile ‑ test_write_pretty
tests.test_fromfile ‑ test_write_xml_without_testsuite_tag

tests.test_fromfile ‑ test_fromfile_file_obj
tests.test_fromfile ‑ test_fromfile_filelike_obj
tests.test_fromfile ‑ test_fromfile_url
tests.test_write ‑ test_read_written_xml
tests.test_write ‑ test_write
tests.test_write ‑ test_write_file_obj
tests.test_write ‑ test_write_filelike_obj
tests.test_write ‑ test_write_noarg
tests.test_write ‑ test_write_nonascii
tests.test_write ‑ test_write_pretty
…

♻️ This comment has been updated with latest results.