diff --git a/Makefile b/Makefile
index 732d765f1c..358193597f 100644
--- a/Makefile
+++ b/Makefile
@@ -1344,6 +1344,7 @@ CLAR_TEST_SUITES += u-hashmap
 CLAR_TEST_SUITES += u-mem-pool
 CLAR_TEST_SUITES += u-prio-queue
 CLAR_TEST_SUITES += u-reftable-tree
+CLAR_TEST_SUITES += u-strbuf
 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))
@@ -1361,7 +1362,6 @@ UNIT_TEST_PROGRAMS += t-reftable-reader
 UNIT_TEST_PROGRAMS += t-reftable-readwrite
 UNIT_TEST_PROGRAMS += t-reftable-record
 UNIT_TEST_PROGRAMS += t-reftable-stack
-UNIT_TEST_PROGRAMS += t-strbuf
 UNIT_TEST_PROGRAMS += t-strcmp-offset
 UNIT_TEST_PROGRAMS += t-trailer
 UNIT_TEST_PROGRAMS += t-urlmatch-normalization
diff --git a/t/meson.build b/t/meson.build
index c7e08eca6f..6cb72842b1 100644
--- a/t/meson.build
+++ b/t/meson.build
@@ -6,6 +6,7 @@ clar_test_suites = [
   'unit-tests/u-mem-pool.c',
   'unit-tests/u-prio-queue.c',
   'unit-tests/u-reftable-tree.c',
+  'unit-tests/u-strbuf.c',
   'unit-tests/u-strvec.c',
 ]
 
@@ -57,7 +58,6 @@ unit_test_programs = [
   'unit-tests/t-reftable-readwrite.c',
   'unit-tests/t-reftable-record.c',
   'unit-tests/t-reftable-stack.c',
-  'unit-tests/t-strbuf.c',
   'unit-tests/t-strcmp-offset.c',
   'unit-tests/t-trailer.c',
   'unit-tests/t-urlmatch-normalization.c',
diff --git a/t/unit-tests/t-strbuf.c b/t/unit-tests/t-strbuf.c
deleted file mode 100644
index 3f4044d697..0000000000
--- a/t/unit-tests/t-strbuf.c
+++ /dev/null
@@ -1,122 +0,0 @@
-#include "test-lib.h"
-#include "strbuf.h"
-
-/* wrapper that supplies tests with an empty, initialized strbuf */
-static void setup(void (*f)(struct strbuf*, const void*),
-		  const void *data)
-{
-	struct strbuf buf = STRBUF_INIT;
-
-	f(&buf, data);
-	strbuf_release(&buf);
-	check_uint(buf.len, ==, 0);
-	check_uint(buf.alloc, ==, 0);
-}
-
-/* wrapper that supplies tests with a populated, initialized strbuf */
-static void setup_populated(void (*f)(struct strbuf*, const void*),
-			    const char *init_str, const void *data)
-{
-	struct strbuf buf = STRBUF_INIT;
-
-	strbuf_addstr(&buf, init_str);
-	check_uint(buf.len, ==, strlen(init_str));
-	f(&buf, data);
-	strbuf_release(&buf);
-	check_uint(buf.len, ==, 0);
-	check_uint(buf.alloc, ==, 0);
-}
-
-static int assert_sane_strbuf(struct strbuf *buf)
-{
-	/* Initialized strbufs should always have a non-NULL buffer */
-	if (!check(!!buf->buf))
-		return 0;
-	/* Buffers should always be NUL-terminated */
-	if (!check_char(buf->buf[buf->len], ==, '\0'))
-		return 0;
-	/*
-	 * Freshly-initialized strbufs may not have a dynamically allocated
-	 * buffer
-	 */
-	if (buf->len == 0 && buf->alloc == 0)
-		return 1;
-	/* alloc must be at least one byte larger than len */
-	return check_uint(buf->len, <, buf->alloc);
-}
-
-static void t_static_init(void)
-{
-	struct strbuf buf = STRBUF_INIT;
-
-	check_uint(buf.len, ==, 0);
-	check_uint(buf.alloc, ==, 0);
-	check_char(buf.buf[0], ==, '\0');
-}
-
-static void t_dynamic_init(void)
-{
-	struct strbuf buf;
-
-	strbuf_init(&buf, 1024);
-	check(assert_sane_strbuf(&buf));
-	check_uint(buf.len, ==, 0);
-	check_uint(buf.alloc, >=, 1024);
-	check_char(buf.buf[0], ==, '\0');
-	strbuf_release(&buf);
-}
-
-static void t_addch(struct strbuf *buf, const void *data)
-{
-	const char *p_ch = data;
-	const char ch = *p_ch;
-	size_t orig_alloc = buf->alloc;
-	size_t orig_len = buf->len;
-
-	if (!check(assert_sane_strbuf(buf)))
-		return;
-	strbuf_addch(buf, ch);
-	if (!check(assert_sane_strbuf(buf)))
-		return;
-	if (!(check_uint(buf->len, ==, orig_len + 1) &&
-	      check_uint(buf->alloc, >=, orig_alloc)))
-		return; /* avoid de-referencing buf->buf */
-	check_char(buf->buf[buf->len - 1], ==, ch);
-	check_char(buf->buf[buf->len], ==, '\0');
-}
-
-static void t_addstr(struct strbuf *buf, const void *data)
-{
-	const char *text = data;
-	size_t len = strlen(text);
-	size_t orig_alloc = buf->alloc;
-	size_t orig_len = buf->len;
-
-	if (!check(assert_sane_strbuf(buf)))
-		return;
-	strbuf_addstr(buf, text);
-	if (!check(assert_sane_strbuf(buf)))
-		return;
-	if (!(check_uint(buf->len, ==, orig_len + len) &&
-	      check_uint(buf->alloc, >=, orig_alloc) &&
-	      check_uint(buf->alloc, >, orig_len + len) &&
-	      check_char(buf->buf[orig_len + len], ==, '\0')))
-	    return;
-	check_str(buf->buf + orig_len, text);
-}
-
-int cmd_main(int argc UNUSED, const char **argv UNUSED)
-{
-	if (!TEST(t_static_init(), "static initialization works"))
-		test_skip_all("STRBUF_INIT is broken");
-	TEST(t_dynamic_init(), "dynamic initialization works");
-	TEST(setup(t_addch, "a"), "strbuf_addch adds char");
-	TEST(setup(t_addch, ""), "strbuf_addch adds NUL char");
-	TEST(setup_populated(t_addch, "initial value", "a"),
-	     "strbuf_addch appends to initial value");
-	TEST(setup(t_addstr, "hello there"), "strbuf_addstr adds string");
-	TEST(setup_populated(t_addstr, "initial value", "hello there"),
-	     "strbuf_addstr appends string to initial value");
-
-	return test_done();
-}
diff --git a/t/unit-tests/u-strbuf.c b/t/unit-tests/u-strbuf.c
new file mode 100644
index 0000000000..fec3c768d2
--- /dev/null
+++ b/t/unit-tests/u-strbuf.c
@@ -0,0 +1,121 @@
+#include "unit-test.h"
+#include "strbuf.h"
+
+/* wrapper that supplies tests with an empty, initialized strbuf */
+static void setup(void (*f)(struct strbuf*, const void*),
+		  const void *data)
+{
+	struct strbuf buf = STRBUF_INIT;
+
+	f(&buf, data);
+	strbuf_release(&buf);
+	cl_assert_equal_i(buf.len, 0);
+	cl_assert_equal_i(buf.alloc, 0);
+}
+
+/* wrapper that supplies tests with a populated, initialized strbuf */
+static void setup_populated(void (*f)(struct strbuf*, const void*),
+			    const char *init_str, const void *data)
+{
+	struct strbuf buf = STRBUF_INIT;
+
+	strbuf_addstr(&buf, init_str);
+	cl_assert_equal_i(buf.len, strlen(init_str));
+	f(&buf, data);
+	strbuf_release(&buf);
+	cl_assert_equal_i(buf.len, 0);
+	cl_assert_equal_i(buf.alloc, 0);
+}
+
+static void assert_sane_strbuf(struct strbuf *buf)
+{
+	/* Initialized strbufs should always have a non-NULL buffer */
+	cl_assert(buf->buf != NULL);
+	/* Buffers should always be NUL-terminated */
+	cl_assert(buf->buf[buf->len] == '\0');
+	/*
+	 * Freshly-initialized strbufs may not have a dynamically allocated
+	 * buffer
+	 */
+	if (buf->len == 0 && buf->alloc == 0)
+		return;
+	/* alloc must be at least one byte larger than len */
+	cl_assert(buf->len < buf->alloc);
+}
+
+void test_strbuf__static_init(void)
+{
+	struct strbuf buf = STRBUF_INIT;
+
+	cl_assert_equal_i(buf.len, 0);
+	cl_assert_equal_i(buf.alloc, 0);
+	cl_assert(buf.buf[0] == '\0');
+}
+
+void test_strbuf__dynamic_init(void)
+{
+	struct strbuf buf;
+
+	strbuf_init(&buf, 1024);
+	assert_sane_strbuf(&buf);
+	cl_assert_equal_i(buf.len, 0);
+	cl_assert(buf.alloc >= 1024);
+	cl_assert(buf.buf[0] == '\0');
+	strbuf_release(&buf);
+}
+
+static void t_addch(struct strbuf *buf, const void *data)
+{
+	const char *p_ch = data;
+	const char ch = *p_ch;
+	size_t orig_alloc = buf->alloc;
+	size_t orig_len = buf->len;
+
+	assert_sane_strbuf(buf);
+	strbuf_addch(buf, ch);
+	assert_sane_strbuf(buf);
+	cl_assert_equal_i(buf->len, orig_len + 1);
+	cl_assert(buf->alloc >= orig_alloc);
+	cl_assert(buf->buf[buf->len] == '\0');
+}
+
+static void t_addstr(struct strbuf *buf, const void *data)
+{
+	const char *text = data;
+	size_t len = strlen(text);
+	size_t orig_alloc = buf->alloc;
+	size_t orig_len = buf->len;
+
+	assert_sane_strbuf(buf);
+	strbuf_addstr(buf, text);
+	assert_sane_strbuf(buf);
+	cl_assert_equal_i(buf->len, orig_len + len);
+	cl_assert(buf->alloc >= orig_alloc);
+	cl_assert(buf->buf[buf->len] == '\0');
+	cl_assert_equal_s(buf->buf + orig_len, text);
+}
+
+void test_strbuf__add_single_char(void)
+{
+	setup(t_addch, "a");
+}
+
+void test_strbuf__add_empty_char(void)
+{
+	setup(t_addch, "");
+}
+
+void test_strbuf__add_multi_char(void)
+{
+	setup_populated(t_addch, "initial value", "a");
+}
+
+void test_strbuf__add_single_str(void)
+{
+	setup(t_addstr, "hello there");
+}
+
+void test_strbuf__add_multi_str(void)
+{
+	setup_populated(t_addstr, "initial value", "hello there");
+}
