t/unit-tests: convert mem-pool test to use clar test framework

Adapt the mem-pool test script to use clar framework by using clar
assertions where necessary.Test functions are created as a standalone to
test different test cases.

Mentored-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Seyi Kuforiji <kuforiji98@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -1338,6 +1338,7 @@ THIRD_PARTY_SOURCES += $(UNIT_TEST_DIR)/clar/%
 THIRD_PARTY_SOURCES += $(UNIT_TEST_DIR)/clar/clar/%
 
 CLAR_TEST_SUITES += u-ctype
+CLAR_TEST_SUITES += u-mem-pool
 CLAR_TEST_SUITES += u-strvec
 CLAR_TEST_PROG = $(UNIT_TEST_BIN)/unit-tests$(X)
 CLAR_TEST_OBJS = $(patsubst %,$(UNIT_TEST_DIR)/%.o,$(CLAR_TEST_SUITES))
@@ -1347,7 +1348,6 @@ CLAR_TEST_OBJS += $(UNIT_TEST_DIR)/unit-test.o
 UNIT_TEST_PROGRAMS += t-example-decorate
 UNIT_TEST_PROGRAMS += t-hash
 UNIT_TEST_PROGRAMS += t-hashmap
-UNIT_TEST_PROGRAMS += t-mem-pool
 UNIT_TEST_PROGRAMS += t-oid-array
 UNIT_TEST_PROGRAMS += t-oidmap
 UNIT_TEST_PROGRAMS += t-oidtree

t/meson.build

@@ -1,5 +1,6 @@
 clar_test_suites = [
   'unit-tests/u-ctype.c',
+  'unit-tests/u-mem-pool.c',
   'unit-tests/u-strvec.c',
 ]
 
@@ -43,7 +44,6 @@ unit_test_programs = [
   'unit-tests/t-example-decorate.c',
   'unit-tests/t-hash.c',
   'unit-tests/t-hashmap.c',
-  'unit-tests/t-mem-pool.c',
   'unit-tests/t-oid-array.c',
   'unit-tests/t-oidmap.c',
   'unit-tests/t-oidtree.c',

t/unit-tests/u-mem-pool.c

@@ -0,0 +1,25 @@
+#include "unit-test.h"
+#include "mem-pool.h"
+
+static void test_many_pool_allocations(size_t block_alloc)
+{
+	struct mem_pool pool = { .block_alloc = block_alloc };
+	size_t size = 100;
+	char *buffer = mem_pool_calloc(&pool, 1, size);
+	for (size_t i = 0; i < size; i++)
+		cl_assert_equal_i(0, buffer[i]);
+	cl_assert(pool.mp_block != NULL);
+	cl_assert(pool.mp_block->next_free != NULL);
+	cl_assert(pool.mp_block->end != NULL);
+	mem_pool_discard(&pool, 0);
+}
+
+void test_mem_pool__big_block(void)
+{
+	test_many_pool_allocations(1024 * 1024);
+}
+
+void test_mem_pool__tiny_block(void)
+{
+	test_many_pool_allocations(1);
+}