[PATCH v6 7/7] test: rng: Add a UT testcase for the rng command

[Sughosh Ganu]

The 'rng' command dumps a number of random bytes on the console. Add a
set of tests for the 'rng' command. The test function performs basic
sanity testing of the command.

Since a unit test is being added for the command, enable it by default
in the sandbox platforms.

Reviewed-by: Simon Glass <s...@chromium.org>
Signed-off-by: Sughosh Ganu <sughosh.g...@linaro.org>
---
 cmd/Kconfig   |  1 +
 test/dm/rng.c | 29 +++++++++++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 09193b61b9..eee5d44348 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -1916,6 +1916,7 @@ config CMD_GETTIME
 config CMD_RNG
        bool "rng command"
        depends on DM_RNG
+       default y if SANDBOX
        select HEXDUMP
        help
          Print bytes from the hardware random number generator.
diff --git a/test/dm/rng.c b/test/dm/rng.c
index 5b34c93ed6..6d1f68848d 100644
--- a/test/dm/rng.c
+++ b/test/dm/rng.c
@@ -25,3 +25,32 @@ static int dm_test_rng_read(struct unit_test_state *uts)
        return 0;
 }
 DM_TEST(dm_test_rng_read, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT);
+
+/* Test the rng command */
+static int dm_test_rng_cmd(struct unit_test_state *uts)
+{
+       struct udevice *dev;
+
+       ut_assertok(uclass_get_device(UCLASS_RNG, 0, &dev));
+       ut_assertnonnull(dev);
+
+       ut_assertok(console_record_reset_enable());
+
+       run_command("rng", 0);
+       ut_assert_nextlinen("00000000:");
+       ut_assert_nextlinen("00000010:");
+       ut_assert_nextlinen("00000020:");
+       ut_assert_nextlinen("00000030:");
+       ut_assert_console_end();
+
+       run_command("rng 0 10", 0);
+       ut_assert_nextlinen("00000000:");
+       ut_assert_console_end();
+
+       run_command("rng 20", 0);
+       ut_assert_nextlinen("No RNG device");
+       ut_assert_console_end();
+
+       return 0;
+}
+DM_TEST(dm_test_rng_cmd, UT_TESTF_SCAN_PDATA | UT_TESTF_SCAN_FDT | 
UT_TESTF_CONSOLE_REC);
-- 
2.25.1