Add test runner

This patch adds a "magic" test runner which discovers all test cases in the
executable into which it is linked. This is achieved through the use of a
special macro used to declare tests, so that they are added onto a linker-
generated list. The linker list logic is largely taken from U-Boot source code,
with minor some tweaks made.

This linker-generated list is then used at runtime in order to pick out every
test case which can be run, resulting in a cross-file "suite" of unity unit
tests, rather than separate test executables per module. A sample test module,
test_test.c is provided to illustrate the test runner's ability to correctly
discover tests across multiple translation units.

1 files changed, 3 insertions, 1 deletions

diff --git a/Makefile b/Makefile
index e05f490..73d957d 100644
--- a/Makefile
+++ b/Makefile
@@ -51,9 +51,11 @@ clean:
 
 test: \
 	$(UNITY_O) \
+	build/native/test_runner.o \
 	build/native/test_util.o \
+	build/native/test_test.o \
 	build/native/util.o
-	$(CC) $(LDFLAGS) -o $@ $^
+	$(CC) $(LDFLAGS) -Wl,-T,linker_list.lds -o $@ $^
 	./$@
 
 # ELF for real hardware. No mock/sim hardware included (except barometer,