Update the assertions to re-align with changed dependency trees.

Signed-off-by: Frank Viernau <[email protected]>

This fixes several test cases in e.g. `test_cli.py`, `test_apy.py`.

Signed-off-by: Frank Viernau <[email protected]>

`Distribution.from_link()` derives the version string of a package from
the given (percent encoded) `Link.url`. That derivation lacks the
decoding, so the resulting version string may also contain percent
encoded characters in which case the dependency resolution fails.

Fix the resolution by URL adding the missing unquoting.

Fixes aboutcode-org#143.

Signed-off-by: Frank Viernau <[email protected]>

Move the resolution to the from_filename() method in subclasses

Reference: aboutcode-org#143
Signed-off-by: Philippe Ombredanne <[email protected]>

These new test were missing originally and they excercise all the
corner cases of encoding.

Reference: aboutcode-org#143
Signed-off-by: Philippe Ombredanne <[email protected]>

* Ensure that we honor the --generic-paths option when converting to
plain mapping.

* Avoid recursive imports by moving remove_test_data_dir_variable_prefix
to utils.py

* Simplifify tests to bypass the creation of an output file when not
needed

* Some tests are also updated to account for package version updates.

Reference: aboutcode-org#143
Signed-off-by: Philippe Ombredanne <[email protected]>