fixes example test failures on Mac

Author: duncanpo

examples/metrics/metrics_example.m

@@ -18,6 +18,8 @@ function metrics_example(iterations)
 u = createUpDownCounter(m, "updowncounter");
 h = createHistogram(m, "histogram");
 
+% wait a little before starting
+pause(2);
 for i = 1:iterations
     c.add(randi(10));
     u.add(randi([-10 10]));

test/texamples.m

@@ -260,8 +260,8 @@ function testWebread(testCase)
             server = fullfile(serverfolder, "webread_example_server");
 
             % start the C++ server
-            %system(server + '&');
             testCase.applyFixture(CppServerFixture(server, testCase));
+            pause(3);       % wait a little for server to start up
 
             % run the example
             webread_example();

test/utils/commonTeardown.m

@@ -3,8 +3,8 @@ function commonTeardown(testCase)
 
 % Copyright 2023-2024 The MathWorks, Inc.
 
-% Terminate Collector if it is still running
-terminateProcess(testCase, testCase.OtelcolName);
+% Terminate Collector if it is still running. Use interrupt signal.
+terminateProcess(testCase, testCase.OtelcolName, testCase.Sigint);
 
 % Close command window if opened
 closeWindow(testCase);

test/utils/readJsonResults.m

@@ -3,8 +3,8 @@
 
 % Copyright 2023-2024 The MathWorks, Inc.
 
-% terminate the collector
-terminateProcess(testCase, testCase.OtelcolName);
+% terminate the collector, using interrupt signal
+terminateProcess(testCase, testCase.OtelcolName, testCase.Sigint);
 
 assert(exist(testCase.JsonFile, "file"));
 

test/utils/terminateProcess.m

@@ -1,16 +1,23 @@
-function terminateProcess(testCase, process)
+function terminateProcess(testCase, process, terminatecmd)
 % Terminate a process started in a test
 
 % Copyright 2023-2024 The MathWorks, Inc.
 
+if nargin < 3
+    terminatecmd = testCase.Sigterm;  % defaults to terminate signal
+end
+
 system(testCase.ListPid(process) + " > " + testCase.PidFile);
 tbl = testCase.ReadPidList(testCase.PidFile);
 pid = testCase.ExtractPid(tbl);
 retry = 0;
 % sometimes kill will fail with a RuntimeError: windows-kill-library: ctrl-routine:findAddress:checkAddressIsNotNull 
 % Retry up to 3 times
 while ~isempty(pid) && retry < 4
-    system(testCase.Sigint(pid));
+    % kill all if multiple instances found
+    for i = 1:numel(pid)
+        system(terminatecmd(pid(i)));
+    end
     pause(2);  % give a little time for the collector to shut down
     system(testCase.ListPid(process) + " > " + testCase.PidFile);
     tbl = testCase.ReadPidList(testCase.PidFile);