oeqa/selftest/recipetool: Use with to control file handle lifetime

(From OE-Core rev: 890fbd77315474fbd582f8bbeb26925c6a42d8d4)

Signed-off-by: Ola x Nilsson <olani@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/selftest/cases/recipetool.py

@@ -685,7 +685,9 @@ class RecipetoolAppendsrcTests(RecipetoolAppendsrcBase):
 
         self._test_appendsrcfile(testrecipe, filepath, srcdir=subdir)
         bitbake('%s:do_unpack' % testrecipe)
-        self.assertEqual(open(self.testfile, 'r').read(), open(os.path.join(srcdir, filepath), 'r').read())
+        with open(self.testfile, 'r') as testfile:
+            with open(os.path.join(srcdir, filepath), 'r') as makefilein:
+                self.assertEqual(testfile.read(), makefilein.read())
 
     def test_recipetool_appendsrcfiles_basic(self, destdir=None):
         newfiles = [self.testfile]