use keepMeasuring in performance tests instead of explicit looping

Author: duncanpo

test/performance/logsTest.m

@@ -52,12 +52,9 @@ function testEmitLogRecord(testCase)
             % create and emit a log record
             lg = opentelemetry.logs.getLogger("foo");
 
-            testCase.startMeasuring();
-            % run through a loop since the time for 1 iteration is too short
-            for i = 1:10
+            while(testCase.keepMeasuring)
                 emitLogRecord(lg, "info", "bar");
             end
-            testCase.stopMeasuring();
         end
 
         function testAttributes(testCase)

test/performance/metricsTest.m

@@ -110,38 +110,29 @@ function testCounterAdd(testCase)
             mt = opentelemetry.metrics.getMeter("foo");
             c = createCounter(mt, "bar");
 
-            testCase.startMeasuring();     
-            % run through a loop since the time for 1 iteration is too short
-            for i = 1:10
+            while(testCase.keepMeasuring)
                 add(c, 5);
             end
-            testCase.stopMeasuring();
         end
 
         function testUpDownCounterAdd(testCase)
             % Increment an up-down-counter
             mt = opentelemetry.metrics.getMeter("foo");
             c = createUpDownCounter(mt, "bar");
 
-            testCase.startMeasuring();
-            % run through a loop since the time for 1 iteration is too short
-            for i = 1:10
+            while(testCase.keepMeasuring)
                 add(c, -5);
             end
-            testCase.stopMeasuring();
         end
 
         function testHistogramRecord(testCase)
             % record a histogram value
             mt = opentelemetry.metrics.getMeter("foo");
             h = createHistogram(mt, "bar");
 
-            testCase.startMeasuring();
-            % run through a loop since the time for 1 iteration is too short
-            for i = 1:10
+            while(testCase.keepMeasuring)
                 record(h, 111);
             end
-            testCase.stopMeasuring();
         end
 
         function testCounterAttributes(testCase)