support/testing: add 4th runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit b09ae4f0454105afd2b41b2a49f4682d9ee57769)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1761,6 +1761,7 @@ F:	support/testing/tests/package/sample_python_midiutil.py
 F:	support/testing/tests/package/sample_python_ml_dtypes.py
 F:	support/testing/tests/package/sample_python_pyalsa.py
 F:	support/testing/tests/package/sample_python_spake2.py
+F:	support/testing/tests/package/test_4th.py
 F:	support/testing/tests/package/test_acl.py
 F:	support/testing/tests/package/test_acpica.py
 F:	support/testing/tests/package/test_acpica/

support/testing/tests/package/test_4th.py

@@ -0,0 +1,55 @@
+import os
+from math import sqrt
+
+import infra.basetest
+
+
+class Test4th(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_4TH=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()
+
+        # We set the DIR4TH variable where 4th demos and libraries are
+        # installed.
+        self.assertRunOk("export DIR4TH=/usr/share/4th/")
+
+        # We run a simple "hello world" demo.
+        out, ret = self.emulator.run("4th cxq demo/hello.4th")
+        self.assertEqual(ret, 0)
+        self.assertEqual(out[0], "Hello world!")
+
+        # We run a demo doing some square root maths.
+        out, ret = self.emulator.run("4th cxq demo/squares.4th")
+        self.assertEqual(ret, 0)
+        self.assertTrue(len(out) > 1)
+        for line in out[1:]:
+            columns = line.split()
+            value = float(columns[0])
+            value_sqrt = float(columns[1])
+            result_check = sqrt(value)
+            self.assertAlmostEqual(value_sqrt, result_check, delta=0.1)
+
+        # We run a word count demo and the 4th source file. We save
+        # the word count for a later check.
+        out, ret = self.emulator.run("4th cxq wc.4th /usr/share/4th/wc.4th")
+        self.assertEqual(ret, 0)
+        wc_out = out[0].split()
+
+        # We run the same command using system "wc" command. We expect
+        # the same numbers.
+        out, ret = self.emulator.run("wc /usr/share/4th/wc.4th")
+        self.assertEqual(ret, 0)
+        self.assertEqual(out[0].split(), wc_out)
+
+        # We run a slightly more complex computation example.
+        self.assertRunOk("4th cxq fractals.4th")