unit-tests: add if_test

The macro TEST only allows defining a test that consists of a single
expression.  Add a new macro, if_test, which provides a way to define
unit tests that are made up of one or more statements.

if_test allows defining self-contained tests en bloc, a bit like
test_expect_success does for regular tests.  It acts like a conditional;
the test body is executed if test_skip_all() had not been called before.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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