Update the guidance for adding new tests to describe the subdirectory
structure instead of the numbering scheme.

Signed-off-by: Simon Glass <simon.glass@canonical.com>

Move the remaining 60 or so test files into an entry/ subdirectory.
These cover general entry types and features: entry args, fill, text,
env, compress, replace, template, collection, ELF, overlap, listing,
sections, symlink, TEE OS, and other miscellaneous entries. Drop the
numeric prefixes and update all references.

Signed-off-by: Simon Glass <simon.glass@canonical.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>

Move about 20 test files for vendor-specific platform support (TI, NXP
i.MX, Renesas R-Car, Rockchip, PowerPC MPC85xx) into a vendor/
subdirectory. Drop the numeric prefixes and update all references.

Signed-off-by: Simon Glass <simon.glass@canonical.com>

Move about 10 test files for ChromeOS entries (GBB, vblock, FMAP)
into a cros/ subdirectory. Drop the numeric prefixes and update all
references.

Signed-off-by: Simon Glass <simon.glass@canonical.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>

Move about 50 test files related to basic layout, packing, alignment,
sections, and image structure into a pack/ subdirectory. Drop the
numeric prefixes from the filenames and update all references in
ftest.py, entry_test.py, and binman_tests.rst

Signed-off-by: Simon Glass <simon.glass@canonical.com>
Reviewed-by: Quentin Schulz <quentin.schulz@cherry.de>

This function is sometimes useful outside tests. Also it can affect how
terminal output is done, e.g. whether ANSI characters should be emitted
or not.

Move it out of the test_util package and into terminal.

Signed-off-by: Simon Glass <sjg@chromium.org>

Provide a short description of how tests work, why they are so critical
and how to resolve gaps in Binman's test coverage.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>