4 files changed, 12 insertions, 10 deletions
diff --git a/t/helper/test-hashmap.c b/t/helper/test-hashmap.c
index 0eb0b3d49c..2912899558 100644
--- a/t/helper/test-hashmap.c
+++ b/t/helper/test-hashmap.c
@@ -36,7 +36,8 @@ static int test_entry_cmp(const void *cmp_data,
 }
 
 static struct test_entry *alloc_test_entry(unsigned int hash,
-					   char *key, char *value)
+					   const char *key,
+					   const char *value)
 {
 	size_t klen = strlen(key);
 	size_t vlen = strlen(value);
diff --git a/t/helper/test-json-writer.c b/t/helper/test-json-writer.c
index afe393f597..ed52eb76bf 100644
--- a/t/helper/test-json-writer.c
+++ b/t/helper/test-json-writer.c
@@ -174,7 +174,7 @@ static void make_arr4(int pretty)
 	jw_end(&arr4);
 }
 
-static char *expect_nest1 =
+static const char *expect_nest1 =
 	"{\"obj1\":{\"a\":\"abc\",\"b\":42,\"c\":true},\"arr1\":[\"abc\",42,true]}";
 
 static struct json_writer nest1 = JSON_WRITER_INIT;
@@ -195,10 +195,10 @@ static void make_nest1(int pretty)
 	jw_release(&arr1);
 }
 
-static char *expect_inline1 =
+static const char *expect_inline1 =
 	"{\"obj1\":{\"a\":\"abc\",\"b\":42,\"c\":true},\"arr1\":[\"abc\",42,true]}";
 
-static char *pretty_inline1 =
+static const char *pretty_inline1 =
 	("{\n"
 	 "  \"obj1\": {\n"
 	 "    \"a\": \"abc\",\n"
@@ -236,10 +236,10 @@ static void make_inline1(int pretty)
 	jw_end(&inline1);
 }
 
-static char *expect_inline2 =
+static const char *expect_inline2 =
 	"[[1,2],[3,4],{\"a\":\"abc\"}]";
 
-static char *pretty_inline2 =
+static const char *pretty_inline2 =
 	("[\n"
 	 "  [\n"
 	 "    1,\n"
diff --git a/t/helper/test-regex.c b/t/helper/test-regex.c
index 80042eafc2..366bd70976 100644
--- a/t/helper/test-regex.c
+++ b/t/helper/test-regex.c
@@ -20,8 +20,8 @@ static struct reg_flag reg_flags[] = {
 
 static int test_regex_bug(void)
 {
-	char *pat = "[^={} \t]+";
-	char *str = "={}\nfred";
+	const char *pat = "[^={} \t]+";
+	const char *str = "={}\nfred";
 	regex_t r;
 	regmatch_t m[1];
 
diff --git a/t/helper/test-rot13-filter.c b/t/helper/test-rot13-filter.c
index f8d564c622..7e1d9e0ee4 100644
--- a/t/helper/test-rot13-filter.c
+++ b/t/helper/test-rot13-filter.c
@@ -136,7 +136,7 @@ static void free_delay_entries(void)
 	strmap_clear(&delay, 0);
 }
 
-static void add_delay_entry(char *pathname, int count, int requested)
+static void add_delay_entry(const char *pathname, int count, int requested)
 {
 	struct delay_entry *entry = xcalloc(1, sizeof(*entry));
 	entry->count = count;
@@ -189,7 +189,8 @@ static void reply_list_available_blobs_cmd(void)
 static void command_loop(void)
 {
 	for (;;) {
-		char *buf, *output;
+		char *buf;
+		const char *output;
 		char *pathname;
 		struct delay_entry *entry;
 		struct strbuf input = STRBUF_INIT;