Add Logging and disp message for CppServerFixture to debug Issue 205

Author: MWSestabro

test/texamples.m

@@ -267,9 +267,12 @@ function testWebread(testCase)
             server = fullfile(serverfolder, "webread_example_server");
 
             % start the C++ server
-            testCase.applyFixture(CppServerFixture(server, testCase));
+            fixture = testCase.applyFixture(CppServerFixture(server, testCase));
+            testCase.verifyEqual(fixture.Status,0,"webread_example_server failed to launch with the following output:" + fixture.CmdOut);
             pause(3);       % wait for server to start up
 
+            % using disp to diagnose Issue #205
+            disp(readlines(fixture.OutFile))
             % run the example
             webread_example();
 

test/utils/CppServerFixture.m

@@ -6,6 +6,11 @@
 
     properties(SetAccess=private)
         ServerFile (1,1) string
+        Status     (1,1) double
+        CmdOut     (1,:) char
+        FolderFixture
+        OutFile
+
     end
 
     properties(Access = private)        
@@ -20,10 +25,13 @@
         function fixture = CppServerFixture(serverfile, testCase)
             fixture.ServerFile = string(serverfile);
             fixture.TestCase = testCase;
+            fixture.FolderFixture = testCase.applyFixture(...
+                matlab.unittest.fixtures.TemporaryFolderFixture);
         end
 
         function setup(fixture)
-            system(fixture.ServerFile + '&');
+            fixture.OutFile = fullfile(fixture.FolderFixture.Folder,"webreadfail.txt");
+            [fixture.Status,fixture.CmdOut] = system(fixture.ServerFile + "> " + fixture.OutFile + " 2>&1" +'&');
         end
 
         function teardown(fixture)