diff --git a/Makefile b/Makefile
index abfe5cc29b..dc356ce4dd 100644
--- a/Makefile
+++ b/Makefile
@@ -738,7 +738,7 @@ TEST_BUILTINS_OBJS += test-run-command.o
 TEST_BUILTINS_OBJS += test-scrap-cache-tree.o
 TEST_BUILTINS_OBJS += test-serve-v2.o
 TEST_BUILTINS_OBJS += test-sha1.o
-TEST_BUILTINS_OBJS += test-sha1-array.o
+TEST_BUILTINS_OBJS += test-oid-array.o
 TEST_BUILTINS_OBJS += test-sha256.o
 TEST_BUILTINS_OBJS += test-sigchain.o
 TEST_BUILTINS_OBJS += test-strcmp-offset.o
diff --git a/t/helper/test-sha1-array.c b/t/helper/test-oid-array.c
similarity index 85%
rename from t/helper/test-sha1-array.c
rename to t/helper/test-oid-array.c
index 6f7d3b939e..ce9fd5f091 100644
--- a/t/helper/test-sha1-array.c
+++ b/t/helper/test-oid-array.c
@@ -8,7 +8,7 @@ static int print_oid(const struct object_id *oid, void *data)
 	return 0;
 }
 
-int cmd__sha1_array(int argc, const char **argv)
+int cmd__oid_array(int argc, const char **argv)
 {
 	struct oid_array array = OID_ARRAY_INIT;
 	struct strbuf line = STRBUF_INIT;
@@ -19,11 +19,11 @@ int cmd__sha1_array(int argc, const char **argv)
 
 		if (skip_prefix(line.buf, "append ", &arg)) {
 			if (get_oid_hex(arg, &oid))
-				die("not a hexadecimal SHA1: %s", arg);
+				die("not a hexadecimal oid: %s", arg);
 			oid_array_append(&array, &oid);
 		} else if (skip_prefix(line.buf, "lookup ", &arg)) {
 			if (get_oid_hex(arg, &oid))
-				die("not a hexadecimal SHA1: %s", arg);
+				die("not a hexadecimal oid: %s", arg);
 			printf("%d\n", oid_array_lookup(&array, &oid));
 		} else if (!strcmp(line.buf, "clear"))
 			oid_array_clear(&array);
diff --git a/t/helper/test-tool.c b/t/helper/test-tool.c
index 31eedcd241..c1b320c24c 100644
--- a/t/helper/test-tool.c
+++ b/t/helper/test-tool.c
@@ -37,6 +37,7 @@ static struct test_cmd cmds[] = {
 	{ "match-trees", cmd__match_trees },
 	{ "mergesort", cmd__mergesort },
 	{ "mktemp", cmd__mktemp },
+	{ "oid-array", cmd__oid_array },
 	{ "oidmap", cmd__oidmap },
 	{ "online-cpus", cmd__online_cpus },
 	{ "parse-options", cmd__parse_options },
@@ -57,7 +58,6 @@ static struct test_cmd cmds[] = {
 	{ "scrap-cache-tree", cmd__scrap_cache_tree },
 	{ "serve-v2", cmd__serve_v2 },
 	{ "sha1", cmd__sha1 },
-	{ "sha1-array", cmd__sha1_array },
 	{ "sha256", cmd__sha256 },
 	{ "sigchain", cmd__sigchain },
 	{ "strcmp-offset", cmd__strcmp_offset },
diff --git a/t/helper/test-tool.h b/t/helper/test-tool.h
index 4eb5e6609e..1cbaec02f3 100644
--- a/t/helper/test-tool.h
+++ b/t/helper/test-tool.h
@@ -47,7 +47,7 @@ int cmd__run_command(int argc, const char **argv);
 int cmd__scrap_cache_tree(int argc, const char **argv);
 int cmd__serve_v2(int argc, const char **argv);
 int cmd__sha1(int argc, const char **argv);
-int cmd__sha1_array(int argc, const char **argv);
+int cmd__oid_array(int argc, const char **argv);
 int cmd__sha256(int argc, const char **argv);
 int cmd__sigchain(int argc, const char **argv);
 int cmd__strcmp_offset(int argc, const char **argv);
diff --git a/t/t0064-sha1-array.sh b/t/t0064-sha1-array.sh
index 5dda570b9a..45685af2fd 100755
--- a/t/t0064-sha1-array.sh
+++ b/t/t0064-sha1-array.sh
@@ -18,7 +18,7 @@ test_expect_success 'ordered enumeration' '
 	{
 		echoid append 88 44 aa 55 &&
 		echo for_each_unique
-	} | test-tool sha1-array >actual &&
+	} | test-tool oid-array >actual &&
 	test_cmp expect actual
 '
 
@@ -28,15 +28,15 @@ test_expect_success 'ordered enumeration with duplicate suppression' '
 		echoid append 88 44 aa 55 &&
 		echoid append 88 44 aa 55 &&
 		echo for_each_unique
-	} | test-tool sha1-array >actual &&
+	} | test-tool oid-array >actual &&
 	test_cmp expect actual
 '
 
 test_expect_success 'lookup' '
 	{
 		echoid append 88 44 aa 55 &&
 		echoid lookup 55
-	} | test-tool sha1-array >actual &&
+	} | test-tool oid-array >actual &&
 	n=$(cat actual) &&
 	test "$n" -eq 1
 '
@@ -45,7 +45,7 @@ test_expect_success 'lookup non-existing entry' '
 	{
 		echoid append 88 44 aa 55 &&
 		echoid lookup 33
-	} | test-tool sha1-array >actual &&
+	} | test-tool oid-array >actual &&
 	n=$(cat actual) &&
 	test "$n" -lt 0
 '
@@ -55,7 +55,7 @@ test_expect_success 'lookup with duplicates' '
 		echoid append 88 44 aa 55 &&
 		echoid append 88 44 aa 55 &&
 		echoid lookup 55
-	} | test-tool sha1-array >actual &&
+	} | test-tool oid-array >actual &&
 	n=$(cat actual) &&
 	test "$n" -ge 2 &&
 	test "$n" -le 3
@@ -66,7 +66,7 @@ test_expect_success 'lookup non-existing entry with duplicates' '
 		echoid append 88 44 aa 55 &&
 		echoid append 88 44 aa 55 &&
 		echoid lookup 66
-	} | test-tool sha1-array >actual &&
+	} | test-tool oid-array >actual &&
 	n=$(cat actual) &&
 	test "$n" -lt 0
 '
@@ -81,7 +81,7 @@ test_expect_success 'lookup with almost duplicate values' '
 		echo "append $id1" &&
 		echo "append $id2" &&
 		echoid lookup 55
-	} | test-tool sha1-array >actual &&
+	} | test-tool oid-array >actual &&
 	n=$(cat actual) &&
 	test "$n" -eq 0
 '
@@ -90,7 +90,7 @@ test_expect_success 'lookup with single duplicate value' '
 	{
 		echoid append 55 55 &&
 		echoid lookup 55
-	} | test-tool sha1-array >actual &&
+	} | test-tool oid-array >actual &&
 	n=$(cat actual) &&
 	test "$n" -ge 0 &&
 	test "$n" -le 1
