support/testing: test_erlang: new runtime test

Signed-off-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 9f3797e342)
Signed-off-by: Raphaël Mélotte <raphael.melotte@mind.be>

support/testing/tests/package/test_erlang.py

@@ -0,0 +1,48 @@
+import os
+
+import infra.basetest
+
+
+class TestErlang(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_ERLANG=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="armv7",
+                           kernel="builtin",
+                           options=["-initrd", cpio_file])
+        self.emulator.login()
+
+        # We check the program can execute.
+        self.assertRunOk("erl -version")
+
+        # We check can print a message from the command line.
+        msg = "Hello Buildroot!"
+        erl_expr = f"io:format(\"{msg}~n\"), halt()."
+        cmd = f"erl -noshell -eval '{erl_expr}'"
+        out, ret = self.emulator.run(cmd)
+        self.assertEqual(ret, 0)
+        self.assertEqual(out[0], msg)
+
+        # We check we can exit with a specific code.
+        exit_code = 123
+        erl_expr = f"halt({exit_code})."
+        cmd = f"erl -noshell -eval '{erl_expr}'"
+        out, ret = self.emulator.run(cmd)
+        self.assertEqual(ret, exit_code)
+        self.assertEqual(len(out), 0)
+
+        # We check we can do basic arithmetic.
+        val1 = 1234
+        val2 = 5678
+        erl_expr = f"X = {val1} * {val2}, io:format(\"~p~n\", [X]), halt()."
+        cmd = f"erl -noshell -eval '{erl_expr}'"
+        out, ret = self.emulator.run(cmd)
+        self.assertEqual(ret, 0)
+        expected_result = val1 * val2
+        self.assertEqual(int(out[0]), expected_result)