kconfig: tests: test if recursive inclusion is detected

If recursive inclusion is detected, it should fail with error
messages.  Test this.

This also tests the line numbers in the error message, fixed by
commit 5ae6fcc4bb ("kconfig: fix line number in recursive inclusion
error message").

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Ulf Magnusson <ulfalizer@gmail.com>

scripts/kconfig/tests/err_recursive_inc/__init__.py

@@ -0,0 +1,10 @@
+"""
+Detect recursive inclusion error.
+
+If recursive inclusion is detected, it should fail with error messages.
+"""
+
+
+def test(conf):
+    assert conf.oldaskconfig() != 0
+    assert conf.stderr_contains('expected_stderr')