support/testing: new dieharder runtime test

Note: this test was not working in Buildroot test infrastructure
before commit [1] was merged, because dieharder has the string "# "
in its output.

[1] https://gitlab.com/buildroot.org/buildroot/-/commit/0cad947b964be5612a182413da136fcf0dc5a1f2

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Arnout Vandecappelle <arnout@rnout.be>

DEVELOPERS

@@ -1885,6 +1885,7 @@ F:	support/testing/tests/package/test_cryptsetup.py
 F:	support/testing/tests/package/test_cryptsetup/
 F:	support/testing/tests/package/test_ddrescue.py
 F:	support/testing/tests/package/test_ddrescue/
+F:	support/testing/tests/package/test_dieharder.py
 F:	support/testing/tests/package/test_dmidecode.py
 F:	support/testing/tests/package/test_dos2unix.py
 F:	support/testing/tests/package/test_dosfstools.py

support/testing/tests/package/test_dieharder.py

@@ -0,0 +1,36 @@
+import os
+
+import infra.basetest
+
+
+class TestDieharder(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_DIEHARDER=y
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+        cpio_file = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", cpio_file])
+        self.emulator.login()
+
+        # Check the program can run (by showing its version)
+        self.assertRunOk("dieharder -V")
+
+        # The birthdays randomness test on the mt19937 random number
+        # generator with 25 sample is expected to always succeed.
+        cmd = "dieharder -g mt19937 -d diehard_birthdays -t 25"
+        output, exit_code = self.emulator.run(cmd, timeout=10)
+        self.assertEqual(exit_code, 0)
+        self.assertIn("PASSED", '\n'.join(output))
+
+        # The birthdays randomness test on file /dev/zero is expected
+        # to always fail.
+        cmd = "dieharder -g file_input_raw -f /dev/zero -d diehard_birthdays -t 25"
+        output, exit_code = self.emulator.run(cmd, timeout=40)
+        self.assertEqual(exit_code, 0)
+        self.assertIn("FAILED", '\n'.join(output))