diff --git a/source/tests/Makefile b/source/tests/Makefile
index faa972e..692f9f6 100644
--- a/source/tests/Makefile
+++ b/source/tests/Makefile
@@ -18,6 +18,7 @@ test-obj-y += source/tests/ftl/write_upage.o
 test-obj-y += source/tests/ftl/trace_path.o
 
 test-obj-y += source/tests/ftl/ftl_is_mapped.o
+test-obj-y += source/tests/ftl/ftl_read.o
 
 TEST_CFLAGS += -Dflash_read=__wrap_flash_read
 TEST_CFLAGS += -Dflash_write=__wrap_flash_write
diff --git a/source/tests/flash/mock.c b/source/tests/flash/mock.c
index 5974f25..c0b5ae8 100644
--- a/source/tests/flash/mock.c
+++ b/source/tests/flash/mock.c
@@ -28,7 +28,7 @@ size_t __wrap_flash_read(struct flash_dev *dev, uint32_t addr,
 	if (len > ret_len)
 		len = ret_len;
 
-	if (len)
+	if (len && ret_data)
 		memcpy(data, ret_data, len);
 
 	return len;
@@ -59,6 +59,8 @@ size_t __wrap_flash_write(struct flash_dev *dev, uint32_t addr,
 
 size_t __wrap_flash_write0(struct flash_dev *dev, uint32_t addr, size_t len)
 {
+	(void)dev;
+
 	check_expected(addr);
 	check_expected(len);
 
diff --git a/source/tests/ftl/ftl_read.c b/source/tests/ftl/ftl_read.c
new file mode 100644
index 0000000..0af2b76
--- /dev/null
+++ b/source/tests/ftl/ftl_read.c
@@ -0,0 +1,80 @@
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <setjmp.h>
+
+#include <cmocka.h>
+
+#include <bitops.h>
+#include <flash.h>
+#include <ftl.h>
+#include <macros.h>
+
+static void test_basic_read(void **state)
+{
+	char data[24];
+	struct ftl_map map;
+	int ret;
+
+	(void)state;
+
+	map.log2_page_size = ilog2(4 * KIB);
+	map.outstanding.flags = 0;
+
+	expect_value(__wrap_trace_path, map, &map);
+	expect_value(__wrap_trace_path, new_page_desc, NULL);
+	expect_not_value(__wrap_trace_path, page, NULL);
+	expect_value(__wrap_trace_path, va, 4);
+	will_return(__wrap_trace_path, NULL);
+	will_return(__wrap_trace_path, 42);
+	will_return(__wrap_trace_path, 0);
+
+	expect_value(__wrap_flash_read, addr, 42 << 12 | 0x321);
+	expect_value(__wrap_flash_read, len, 24);
+	will_return(__wrap_flash_read, 24);
+	will_return(__wrap_flash_read, NULL);
+
+	ret = ftl_read(&map, data, 24, 0x4321);
+
+	assert_int_equal(ret, 24);
+}
+
+static void test_boundary(void **state)
+{
+	char data[32];
+	struct ftl_map map;
+	int ret;
+
+	(void)state;
+
+	map.log2_page_size = ilog2(4 * KIB);
+	map.outstanding.flags = 0;
+
+	expect_value(__wrap_trace_path, map, &map);
+	expect_value(__wrap_trace_path, new_page_desc, NULL);
+	expect_not_value(__wrap_trace_path, page, NULL);
+	expect_value(__wrap_trace_path, va, 4);
+	will_return(__wrap_trace_path, NULL);
+	will_return(__wrap_trace_path, 42);
+	will_return(__wrap_trace_path, 0);
+
+	expect_value(__wrap_flash_read, addr, 42 << 12 | 0xff0);
+	expect_value(__wrap_flash_read, len, 16);
+	will_return(__wrap_flash_read, 16);
+	will_return(__wrap_flash_read, NULL);
+
+	ret = ftl_read(&map, data, 32, 0x4ff0);
+
+	assert_int_equal(ret, 16);
+}
+
+int test_ftl_read(void)
+{
+	const struct CMUnitTest tests[] = {
+		{ "ftl_read: basic read", test_basic_read, NULL, NULL, NULL },
+		{ "ftl_read: boundary", test_boundary, NULL, NULL, NULL },
+	};
+
+	return cmocka_run_group_tests_name("ftl_read", tests, NULL, NULL);
+}
diff --git a/source/tests/ftl/main.c b/source/tests/ftl/main.c
index c7d8d20..817adf5 100644
--- a/source/tests/ftl/main.c
+++ b/source/tests/ftl/main.c
@@ -25,6 +25,7 @@ int test_write_upage(void);
 int test_trace_path(void);
 
 int test_ftl_is_mapped(void);
+int test_ftl_read(void);
 
 int test_ftl(void)
 {
@@ -44,6 +45,7 @@ int test_ftl(void)
 	count += test_trace_path();
 
 	count += test_ftl_is_mapped();
+	count += test_ftl_read();
 
 	return count;
 }