Check that removing breakpoints works properly. #1126

src/ptvsd/_vendored/pydevd/_pydevd_frame_eval/pydevd_frame_tracing.py

@@ -46,12 +46,15 @@ def _pydev_stop_at_break(line):
             abs_path_real_path_and_base = get_abs_path_real_path_and_base_from_frame(frame)
         filename = abs_path_real_path_and_base[1]
 
-        breakpoints_for_file = debugger.breakpoints.get(filename)
-
         try:
-            python_breakpoint = breakpoints_for_file[line]
-        except KeyError:
-            pydev_log.debug("Couldn't find breakpoint in the file {} on line {}".format(frame.f_code.co_filename, line))
+            python_breakpoint = debugger.breakpoints[filename][line]
+        except:
+            # print("Couldn't find breakpoint in the file %s on line %s" % (frame.f_code.co_filename, line))
+            # Could be KeyError if line is not there or TypeError if breakpoints_for_file is None.
+            # Note: using catch-all exception for performance reasons (if the user adds a breakpoint
+            # and then removes it after hitting it once, this method added for the programmatic
+            # breakpoint will keep on being called and one of those exceptions will always be raised
+            # here).
             return
 
         if python_breakpoint:

src/ptvsd/_vendored/pydevd/tests_python/test_debugger_json.py

@@ -50,7 +50,7 @@ def write_make_initial_run(self):
     def write_list_threads(self):
         return self.wait_for_response(self.write_request(pydevd_schema.ThreadsRequest()))
 
-    def write_add_breakpoints(self, lines, filename=None, line_to_info=None):
+    def write_set_breakpoints(self, lines, filename=None, line_to_info=None):
         '''
         Adds a breakpoint.
         '''
@@ -102,14 +102,35 @@ def write_disconnect(self):
         self.wait_for_response(self.write_request(request))
 
 
+@pytest.mark.skipif(IS_JYTHON, reason='Must check why it is failing in Jython.')
+def test_case_json_change_breaks(case_setup):
+    with case_setup.test_file('_debugger_case_change_breaks.py') as writer:
+        json_facade = JsonFacade(writer)
+
+        writer.write_set_protocol('http_json')
+        json_facade.write_launch()
+        json_facade.write_set_breakpoints(writer.get_line_index_with_content('break 1'))
+        json_facade.write_make_initial_run()
+        hit = writer.wait_for_breakpoint_hit()
+        writer.write_run_thread(hit.thread_id)
+
+        hit = writer.wait_for_breakpoint_hit()
+        writer.write_run_thread(hit.thread_id)
+
+        json_facade.write_set_breakpoints([])
+        writer.write_run_thread(hit.thread_id)
+
+        writer.finished_ok = True
+
+
 @pytest.mark.skipif(IS_JYTHON, reason='Must check why it is failing in Jython.')
 def test_case_json_protocol(case_setup):
     with case_setup.test_file('_debugger_case_print.py') as writer:
         json_facade = JsonFacade(writer)
 
         writer.write_set_protocol('http_json')
         json_facade.write_launch()
-        json_facade.write_add_breakpoints(writer.get_line_index_with_content('Break here'))
+        json_facade.write_set_breakpoints(writer.get_line_index_with_content('Break here'))
         json_facade.write_make_initial_run()
 
         json_facade.wait_for_json_message(ThreadEvent, lambda event: event.body.reason == 'started')