[PATCH 1/3] tests: add a "env-bool" helper to test-tool

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

This new helper is a wrapper around the git_env_bool() function. There
are various GIT_TEST_* variables described in "Running tests with
special setups" in t/README that use git_env_bool().

A GIT_TEST_* variable implemented in shellscript won't have access to
the same semantics (historically we've used "test -n" for many of
these).

So let's add this helper so we can expose the same environment
variable behavior without exposing the implementation detail of
whether that variable happens to be checked in C or shellscript.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 Makefile                 | 1 +
 t/helper/test-env-bool.c | 9 +++++++++
 t/helper/test-tool.c     | 1 +
 t/helper/test-tool.h     | 1 +
 4 files changed, 12 insertions(+)
 create mode 100644 t/helper/test-env-bool.c

diff --git a/Makefile b/Makefile
index b08d5ea258..ca624c381f 100644
--- a/Makefile
+++ b/Makefile
@@ -723,6 +723,7 @@ TEST_BUILTINS_OBJS += test-dump-fsmonitor.o
 TEST_BUILTINS_OBJS += test-dump-split-index.o
 TEST_BUILTINS_OBJS += test-dump-untracked-cache.o
 TEST_BUILTINS_OBJS += test-example-decorate.o
+TEST_BUILTINS_OBJS += test-env-bool.o
 TEST_BUILTINS_OBJS += test-genrandom.o
 TEST_BUILTINS_OBJS += test-hashmap.o
 TEST_BUILTINS_OBJS += test-index-version.o
diff --git a/t/helper/test-env-bool.c b/t/helper/test-env-bool.c
new file mode 100644
index 0000000000..956b0aa88e
--- /dev/null
+++ b/t/helper/test-env-bool.c
@@ -0,0 +1,9 @@
+#include "test-tool.h"
+#include "cache.h"
+#include "config.h"
+
+int cmd__env_bool(int argc, const char **argv)
+{
+	assert(argc == 2);
+	return !git_env_bool(argv[1], 0);
+}
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index 5df8b682aa..c4481085c4 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -17,6 +17,7 @@ static struct test_cmd cmds[] = {
 	{ "dump-fsmonitor", cmd__dump_fsmonitor },
 	{ "dump-split-index", cmd__dump_split_index },
 	{ "dump-untracked-cache", cmd__dump_untracked_cache },
+	{ "env-bool", cmd__env_bool },
 	{ "example-decorate", cmd__example_decorate },
 	{ "genrandom", cmd__genrandom },
 	{ "hashmap", cmd__hashmap },
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index 71f470b871..f7845fbc56 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -13,6 +13,7 @@ int cmd__dump_cache_tree(int argc, const char **argv);
 int cmd__dump_fsmonitor(int argc, const char **argv);
 int cmd__dump_split_index(int argc, const char **argv);
 int cmd__dump_untracked_cache(int argc, const char **argv);
+int cmd__env_bool(int argc, const char **argv);
 int cmd__example_decorate(int argc, const char **argv);
 int cmd__genrandom(int argc, const char **argv);
 int cmd__hashmap(int argc, const char **argv);
-- 
2.19.1.899.g0250525e69