Update test for Swift progress reports

Updates the test for Swift progress reporting by checking that the
"Importing Swift modules" message only appears twice on its own as the
rest of the reports for this category will have details attached.

Author: chelcassanova

lldb/test/API/functionalities/progress_reporting/swift_progress_reporting/TestSwiftProgressReporting.py

@@ -45,12 +45,22 @@ def test_swift_progress_report(self):
             "Importing Swift standard library",
         ]
 
+        importing_swift_reports = []
         while len(beacons):
             event = lldbutil.fetch_next_event(self, self.listener, self.broadcaster)
             ret_args = lldb.SBDebugger.GetProgressFromEvent(event)
             if self.TraceOn():
                 print(ret_args[0])
 
+            # When importing Swift modules, make sure that we don't get two reports
+            # in a row with the title "Importing Swift modules", i.e. there should be
+            # a report with that title followed by a report with that title and details
+            # attached.
+            if ret_args[0] == "Importing Swift modules":
+                next_event = lldbutil.fetch_next_event(self, self.listener, self.broadcaster)
+                next_ret_args = lldb.SBDebugger.GetProgressFromEvent(next_event)
+                self.assertRegexpMatches(next_ret_args[0], r"Importing Swift modules:+")
+
             for beacon in beacons:
                 if beacon in ret_args[0]:
                     beacons.remove(beacon)