167     const trace0 = new TraceBuilder<string>()  constant
177     traces.addTrace(trace0);
180     expect(TracesUtils.extractTraces(traces)).toEqual([trace0, trace1]);
182     traces.deleteTrace(trace0);
193     const trace0 = new TraceBuilder<string>()  constant
207     traces.addTrace(trace0);
211     expect(TracesUtils.extractTraces(traces)).toEqual([trace0, trace1, trace2]);
214     expect(TracesUtils.extractTraces(traces)).toEqual([trace0]);
224     const trace0 = new TraceBuilder<string>()  constant
234     traces.addTrace(trace0);
236     expect(traces.hasTrace(trace0)).toBeTrue();