t: Make variables one-test per line basis

Signed-off-by: Katsuyuki TATEISHI <kt@wheel.jp>
t: Add new tests for loading

Signed-off-by: Katsuyuki TATEISHI <kt@wheel.jp>
Fix 'exit' in test code exits test harness

Signed-off-by: Katsuyuki TATEISHI <kt@wheel.jp>
t: Add new tests for cmp_ok

Signed-off-by: Katsuyuki TATEISHI <kt@wheel.jp>
Fix skip_all output to comply TAP

Signed-off-by: Katsuyuki TATEISHI <kt@wheel.jp>
t: Add tests for skip_all

Signed-off-by: Katsuyuki TATEISHI <kt@wheel.jp>
t: Add tests for 'tests' and 'done_testing'

Signed-off-by: Katsuyuki TATEISHI <kt@wheel.jp>
README.md: Add SYNOPSIS and INSTALLATION
Merge branches 'update-readme' and 'enhance-tests' into pu