[lldb][NFC] Modernize TestXValuePrinting

lldb/test/API/commands/expression/xvalue/TestXValuePrinting.py

@@ -1,36 +1,15 @@
-
-
 import lldb
 from lldbsuite.test.decorators import *
 from lldbsuite.test.lldbtest import *
 from lldbsuite.test import lldbutil
 
-
 class ExprXValuePrintingTestCase(TestBase):
 
     mydir = TestBase.compute_mydir(__file__)
 
-    def setUp(self):
-        # Call super's setUp().
-        TestBase.setUp(self)
-
-        self.main_source = "main.cpp"
-        self.main_source_spec = lldb.SBFileSpec(self.main_source)
-
-    def do_test(self, dictionary=None):
-        """Printing an xvalue should work."""
-        self.build(dictionary=dictionary)
-
-        (target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(self,
-                                          '// Break here', self.main_source_spec)
-        frame = thread.GetFrameAtIndex(0)
-
-        value = frame.EvaluateExpression("foo().data")
-        self.assertTrue(value.IsValid())
-        self.assertTrue(value.GetError().Success())
-        self.assertEqual(value.GetValueAsSigned(), 1234)
-
     @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr21765")
     def test(self):
-        self.do_test()
-
+        """Printing an xvalue should work."""
+        self.build()
+        lldbutil.run_to_source_breakpoint(self, '// Break here', lldb.SBFileSpec("main.cpp"))
+        self.expect_expr("foo().data", result_value="1234")