diff --git a/Makefile b/Makefile
index d3011e30f7..b0cdc1fd4a 100644
--- a/Makefile
+++ b/Makefile
@@ -1339,6 +1339,9 @@ THIRD_PARTY_SOURCES += $(UNIT_TEST_DIR)/clar/clar/%
 
 CLAR_TEST_SUITES += u-ctype
 CLAR_TEST_SUITES += u-hash
+CLAR_TEST_SUITES += u-mem-pool
+CLAR_TEST_SUITES += u-prio-queue
+CLAR_TEST_SUITES += u-reftable-tree
 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))
@@ -1347,11 +1350,9 @@ CLAR_TEST_OBJS += $(UNIT_TEST_DIR)/unit-test.o
 
 UNIT_TEST_PROGRAMS += t-example-decorate
 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
-UNIT_TEST_PROGRAMS += t-prio-queue
 UNIT_TEST_PROGRAMS += t-reftable-basics
 UNIT_TEST_PROGRAMS += t-reftable-block
 UNIT_TEST_PROGRAMS += t-reftable-merged
@@ -1360,7 +1361,6 @@ 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-reftable-tree
 UNIT_TEST_PROGRAMS += t-strbuf
 UNIT_TEST_PROGRAMS += t-strcmp-offset
 UNIT_TEST_PROGRAMS += t-trailer
diff --git a/t/meson.build b/t/meson.build
index 7b35eadbc8..14fea8dddf 100644
--- a/t/meson.build
+++ b/t/meson.build
@@ -1,6 +1,9 @@
 clar_test_suites = [
   'unit-tests/u-ctype.c',
   'unit-tests/u-hash.c',
+  'unit-tests/u-mem-pool.c',
+  'unit-tests/u-prio-queue.c',
+  'unit-tests/u-reftable-tree.c',
   'unit-tests/u-strvec.c',
 ]
 
@@ -43,11 +46,9 @@ test('unit-tests', clar_unit_tests)
 unit_test_programs = [
   'unit-tests/t-example-decorate.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',
-  'unit-tests/t-prio-queue.c',
   'unit-tests/t-reftable-basics.c',
   'unit-tests/t-reftable-block.c',
   'unit-tests/t-reftable-merged.c',
@@ -56,7 +57,6 @@ unit_test_programs = [
   'unit-tests/t-reftable-readwrite.c',
   'unit-tests/t-reftable-record.c',
   'unit-tests/t-reftable-stack.c',
-  'unit-tests/t-reftable-tree.c',
   'unit-tests/t-strbuf.c',
   'unit-tests/t-strcmp-offset.c',
   'unit-tests/t-trailer.c',
diff --git a/t/unit-tests/generate-clar-decls.sh b/t/unit-tests/generate-clar-decls.sh
index 3b315c64b3..abf6a2ea2a 100755
--- a/t/unit-tests/generate-clar-decls.sh
+++ b/t/unit-tests/generate-clar-decls.sh
@@ -14,6 +14,7 @@ do
 	suite_name=$(basename "$suite")
 	suite_name=${suite_name%.c}
 	suite_name=${suite_name#u-}
+	suite_name=$(echo "$suite_name" | tr '-' '_')
 	sed -ne "s/^\(void test_${suite_name}__[a-zA-Z_0-9][a-zA-Z_0-9]*(void)\)$/extern \1;/p" "$suite" ||
 	exit 1
 done >"$OUTPUT"
diff --git a/t/unit-tests/t-mem-pool.c b/t/unit-tests/t-mem-pool.c
deleted file mode 100644
index fe500c704b..0000000000
--- a/t/unit-tests/t-mem-pool.c
+++ /dev/null
@@ -1,31 +0,0 @@
-#include "test-lib.h"
-#include "mem-pool.h"
-
-static void setup_static(void (*f)(struct mem_pool *), size_t block_alloc)
-{
-	struct mem_pool pool = { .block_alloc = block_alloc };
-	f(&pool);
-	mem_pool_discard(&pool, 0);
-}
-
-static void t_calloc_100(struct mem_pool *pool)
-{
-	size_t size = 100;
-	char *buffer = mem_pool_calloc(pool, 1, size);
-	for (size_t i = 0; i < size; i++)
-		check_int(buffer[i], ==, 0);
-	if (!check(pool->mp_block != NULL))
-		return;
-	check(pool->mp_block->next_free != NULL);
-	check(pool->mp_block->end != NULL);
-}
-
-int cmd_main(int argc UNUSED, const char **argv UNUSED)
-{
-	TEST(setup_static(t_calloc_100, 1024 * 1024),
-	     "mem_pool_calloc returns 100 zeroed bytes with big block");
-	TEST(setup_static(t_calloc_100, 1),
-	     "mem_pool_calloc returns 100 zeroed bytes with tiny block");
-
-	return test_done();
-}
diff --git a/t/unit-tests/t-prio-queue.c b/t/unit-tests/t-prio-queue.c
deleted file mode 100644
index a053635000..0000000000
--- a/t/unit-tests/t-prio-queue.c
+++ /dev/null
@@ -1,91 +0,0 @@
-#include "test-lib.h"
-#include "prio-queue.h"
-
-static int intcmp(const void *va, const void *vb, void *data UNUSED)
-{
-	const int *a = va, *b = vb;
-	return *a - *b;
-}
-
-
-#define MISSING  -1
-#define DUMP	 -2
-#define STACK	 -3
-#define GET	 -4
-#define REVERSE  -5
-
-static int show(int *v)
-{
-	return v ? *v : MISSING;
-}
-
-static void test_prio_queue(int *input, size_t input_size,
-			    int *result, size_t result_size)
-{
-	struct prio_queue pq = { intcmp };
-	int j = 0;
-
-	for (size_t i = 0; i < input_size; i++) {
-		void *peek, *get;
-		switch(input[i]) {
-		case GET:
-			peek = prio_queue_peek(&pq);
-			get = prio_queue_get(&pq);
-			if (!check(peek == get))
-				return;
-			if (!check_uint(j, <, result_size))
-				break;
-			if (!check_int(result[j], ==, show(get)))
-				test_msg("      j: %d", j);
-			j++;
-			break;
-		case DUMP:
-			while ((peek = prio_queue_peek(&pq))) {
-				get = prio_queue_get(&pq);
-				if (!check(peek == get))
-					return;
-				if (!check_uint(j, <, result_size))
-					break;
-				if (!check_int(result[j], ==, show(get)))
-					test_msg("      j: %d", j);
-				j++;
-			}
-			break;
-		case STACK:
-			pq.compare = NULL;
-			break;
-		case REVERSE:
-			prio_queue_reverse(&pq);
-			break;
-		default:
-			prio_queue_put(&pq, &input[i]);
-			break;
-		}
-	}
-	check_uint(j, ==, result_size);
-	clear_prio_queue(&pq);
-}
-
-#define TEST_INPUT(input, result) \
-	test_prio_queue(input, ARRAY_SIZE(input), result, ARRAY_SIZE(result))
-
-int cmd_main(int argc UNUSED, const char **argv UNUSED)
-{
-	TEST(TEST_INPUT(((int []){ 2, 6, 3, 10, 9, 5, 7, 4, 5, 8, 1, DUMP }),
-			((int []){ 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10 })),
-	     "prio-queue works for basic input");
-	TEST(TEST_INPUT(((int []){ 6, 2, 4, GET, 5, 3, GET, GET, 1, DUMP }),
-			((int []){ 2, 3, 4, 1, 5, 6 })),
-	     "prio-queue works for mixed put & get commands");
-	TEST(TEST_INPUT(((int []){ 1, 2, GET, GET, GET, 1, 2, GET, GET, GET }),
-			((int []){ 1, 2, MISSING, 1, 2, MISSING })),
-	     "prio-queue works when queue is empty");
-	TEST(TEST_INPUT(((int []){ STACK, 8, 1, 5, 4, 6, 2, 3, DUMP }),
-			((int []){ 3, 2, 6, 4, 5, 1, 8 })),
-	     "prio-queue works when used as a LIFO stack");
-	TEST(TEST_INPUT(((int []){ STACK, 1, 2, 3, 4, 5, 6, REVERSE, DUMP }),
-			((int []){ 1, 2, 3, 4, 5, 6 })),
-	     "prio-queue works when LIFO stack is reversed");
-
-	return test_done();
-}
diff --git a/t/unit-tests/u-mem-pool.c b/t/unit-tests/u-mem-pool.c
new file mode 100644
index 0000000000..2bc2493b7e
--- /dev/null
+++ b/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);
+}
diff --git a/t/unit-tests/u-prio-queue.c b/t/unit-tests/u-prio-queue.c
new file mode 100644
index 0000000000..145e689c9c
--- /dev/null
+++ b/t/unit-tests/u-prio-queue.c
@@ -0,0 +1,94 @@
+#include "unit-test.h"
+#include "prio-queue.h"
+
+static int intcmp(const void *va, const void *vb, void *data UNUSED)
+{
+	const int *a = va, *b = vb;
+	return *a - *b;
+}
+
+
+#define MISSING  -1
+#define DUMP	 -2
+#define STACK	 -3
+#define GET	 -4
+#define REVERSE  -5
+
+static int show(int *v)
+{
+	return v ? *v : MISSING;
+}
+
+static void test_prio_queue(int *input, size_t input_size,
+			    int *result, size_t result_size)
+{
+	struct prio_queue pq = { intcmp };
+	size_t j = 0;
+
+	for (size_t i = 0; i < input_size; i++) {
+		void *peek, *get;
+		switch(input[i]) {
+		case GET:
+			peek = prio_queue_peek(&pq);
+			get = prio_queue_get(&pq);
+			cl_assert(peek == get);
+			cl_assert(j < result_size);
+			cl_assert_equal_i(result[j], show(get));
+			j++;
+			break;
+		case DUMP:
+			while ((peek = prio_queue_peek(&pq))) {
+				get = prio_queue_get(&pq);
+				cl_assert(peek == get);
+				cl_assert(j < result_size);
+				cl_assert_equal_i(result[j], show(get));
+				j++;
+			}
+			break;
+		case STACK:
+			pq.compare = NULL;
+			break;
+		case REVERSE:
+			prio_queue_reverse(&pq);
+			break;
+		default:
+			prio_queue_put(&pq, &input[i]);
+			break;
+		}
+	}
+	cl_assert_equal_i(j, result_size);
+	clear_prio_queue(&pq);
+}
+
+#define TEST_INPUT(input, result) \
+	test_prio_queue(input, ARRAY_SIZE(input), result, ARRAY_SIZE(result))
+
+void test_prio_queue__basic(void)
+{
+	TEST_INPUT(((int []){ 2, 6, 3, 10, 9, 5, 7, 4, 5, 8, 1, DUMP }),
+		   ((int []){ 1, 2, 3, 4, 5, 5, 6, 7, 8, 9, 10 }));
+}
+
+void test_prio_queue__mixed(void)
+{
+	TEST_INPUT(((int []){ 6, 2, 4, GET, 5, 3, GET, GET, 1, DUMP }),
+		   ((int []){ 2, 3, 4, 1, 5, 6 }));
+}
+
+void test_prio_queue__empty(void)
+{
+	TEST_INPUT(((int []){ 1, 2, GET, GET, GET, 1, 2, GET, GET, GET }),
+		   ((int []){ 1, 2, MISSING, 1, 2, MISSING }));
+}
+
+void test_prio_queue__stack(void)
+{
+	TEST_INPUT(((int []){ STACK, 8, 1, 5, 4, 6, 2, 3, DUMP }),
+		   ((int []){ 3, 2, 6, 4, 5, 1, 8 }));
+}
+
+void test_prio_queue__reverse_stack(void)
+{
+	TEST_INPUT(((int []){ STACK, 1, 2, 3, 4, 5, 6, REVERSE, DUMP }),
+		   ((int []){ 1, 2, 3, 4, 5, 6 }));
+}
diff --git a/t/unit-tests/t-reftable-tree.c b/t/unit-tests/u-reftable-tree.c
similarity index 68%
rename from t/unit-tests/t-reftable-tree.c
rename to t/unit-tests/u-reftable-tree.c
index 79b175a45a..bcf9061071 100644
--- a/t/unit-tests/t-reftable-tree.c
+++ b/t/unit-tests/u-reftable-tree.c
@@ -6,7 +6,7 @@ license that can be found in the LICENSE file or at
 https://developers.google.com/open-source/licenses/bsd
 */
 
-#include "test-lib.h"
+#include "unit-test.h"
 #include "reftable/tree.h"
 
 static int t_compare(const void *a, const void *b)
@@ -25,7 +25,7 @@ static void store(void *arg, void *key)
 	c->arr[c->len++] = key;
 }
 
-static void t_tree_search(void)
+void test_reftable_tree__tree_search(void)
 {
 	struct tree_node *root = NULL;
 	void *values[11] = { 0 };
@@ -38,20 +38,20 @@ static void t_tree_search(void)
 	 */
 	do {
 		nodes[i] = tree_insert(&root, &values[i], &t_compare);
-		check(nodes[i] != NULL);
+		cl_assert(nodes[i] != NULL);
 		i = (i * 7) % 11;
 	} while (i != 1);
 
 	for (i = 1; i < ARRAY_SIZE(nodes); i++) {
-		check_pointer_eq(&values[i], nodes[i]->key);
-		check_pointer_eq(nodes[i], tree_search(root, &values[i], &t_compare));
+		cl_assert_equal_p(&values[i], nodes[i]->key);
+		cl_assert_equal_p(nodes[i], tree_search(root, &values[i], &t_compare));
 	}
 
-	check(!tree_search(root, values, t_compare));
+	cl_assert(tree_search(root, values, t_compare) == NULL);
 	tree_free(root);
 }
 
-static void t_infix_walk(void)
+void test_reftable_tree__infix_walk(void)
 {
 	struct tree_node *root = NULL;
 	void *values[11] = { 0 };
@@ -64,23 +64,15 @@ static void t_infix_walk(void)
 
 	do {
 		struct tree_node *node = tree_insert(&root, &values[i], t_compare);
-		check(node != NULL);
+		cl_assert(node != NULL);
 		i = (i * 7) % 11;
 		count++;
 	} while (i != 1);
 
 	infix_walk(root, &store, &c);
 	for (i = 1; i < ARRAY_SIZE(values); i++)
-		check_pointer_eq(&values[i], out[i - 1]);
-	check(!out[i - 1]);
-	check_int(c.len, ==, count);
+		cl_assert_equal_p(&values[i], out[i - 1]);
+	cl_assert(out[i - 1] == NULL);
+	cl_assert_equal_i(c.len, count);
 	tree_free(root);
 }
-
-int cmd_main(int argc UNUSED, const char *argv[] UNUSED)
-{
-	TEST(t_tree_search(), "tree_search works");
-	TEST(t_infix_walk(), "infix_walk works");
-
-	return test_done();
-}