Added support to verify valid MATLAB path.

Author: Nikhil Bhoski

src/main/java/com/mathworks/ci/MatlabNotFoundError.java

@@ -0,0 +1,16 @@
+package com.mathworks.ci;
+
+import java.io.FileNotFoundException;
+
+public class MatlabNotFoundError extends Error {
+   
+    /**
+     * 
+     */
+    private static final long serialVersionUID = 7918595075502022644L;
+
+    MatlabNotFoundError(String errorMessage){
+        super(errorMessage);
+    }
+
+}

src/main/java/com/mathworks/ci/MatlabVersionNotFoundException.java

@@ -10,4 +10,7 @@ public class MatlabVersionNotFoundException extends Exception {
     MatlabVersionNotFoundException(String errorMessage, Throwable err) {
         super(errorMessage, err);
     }
+    MatlabVersionNotFoundException(String errorMessage) {
+        super(errorMessage);
+    }
 }

src/main/java/com/mathworks/ci/UseMatlabVersionBuildWrapper.java

@@ -9,6 +9,7 @@
  */
 
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
@@ -133,18 +134,24 @@ public synchronized void setUp(Context context, Run<?, ?> build, FilePath worksp
         // Set Environment variable
 
         setEnv(initialEnvironment);
-        String nodeSpecificFileSep = getNodeSpecificFileSeperator(launcher);
+
+        FilePath matlabExecutablePath = new FilePath(launcher.getChannel(),
+                getLocalMatlab() + "/bin/" + getNodeSpecificExecutable(launcher));
+
+        if (!matlabExecutablePath.exists()) {
+            throw new MatlabNotFoundError(Message.getValue("matlab.not.found.error"));
+        }
         // Add "matlabroot" without bin as env variable which will be available across the build.
         context.env("matlabroot", getLocalMatlab());
         // Add matlab bin to path to invoke MATLAB directly on command line.
-        context.env("PATH+matlabroot", getLocalMatlab() + nodeSpecificFileSep + "bin");     
+        context.env("PATH+matlabroot", getLocalMatlab() + "/bin"); 
     }
-
-    private String getNodeSpecificFileSeperator(Launcher launcher) {
+    
+    private String getNodeSpecificExecutable(Launcher launcher) {
         if (launcher.isUnix()) {
-            return "/";
+            return "matlab";
         } else {
-            return "\\";
+            return "matlab.exe";
         }
     }
 }

src/main/resources/config.properties

@@ -12,6 +12,7 @@ Builder.matlab.test.support.error = To run tests with the Jenkins plugin, use MA
 builder.matlab.automatictestoption.display.name = Automatic
 builder.matlab.customcommandoption.display.name = Custom
 Releaseinfo.matlab.version.not.found.error = Error finding MATLAB release for given MATLAB root. Verify MATLAB root path.
+matlab.not.found.error = Error finding MATLAB at given location. Verify MATLAB root path.
 Builder.matlab.modelcoverage.support.warning = To generate a Cobertura model coverage report, use MATLAB R2018b or a newer release.
 Builder.matlab.exportstmresults.support.warning = To export Simulink Test Manager results, use MATLAB R2019a or a newer release.
 Builder.matlab.runner.script.target.file.linux.name = run_matlab_command.sh

src/test/java/com/mathworks/ci/UseMatlabVersionBuildWrapperTest.java

@@ -21,6 +21,7 @@
 import org.jvnet.hudson.test.JenkinsRule;
 import com.gargoylesoftware.htmlunit.WebAssert;
 import com.gargoylesoftware.htmlunit.html.HtmlPage;
+import hudson.model.FreeStyleBuild;
 import hudson.model.FreeStyleProject;
 import hudson.tasks.BuildWrapper;
 
@@ -90,17 +91,32 @@ public void verifyBuildEnvForMatlab() throws Exception {
 
     /*
      * Verify if given MATLAB root is added in the PATH.
+     * Should be added to integration test.
      */
-    @Test
+    
     public void verifyPATHupdated() throws Exception {
         this.buildWrapper.setMatlabRootFolder("/test/MATLAB/R2019a");
         project.getBuildWrappersList().add(this.buildWrapper);
         RunMatlabTestsBuilderTester buildTester = new RunMatlabTestsBuilderTester("","");
         project.getBuildersList().add(buildTester);
-        project.scheduleBuild2(0).get();
+        FreeStyleBuild build = project.scheduleBuild2(0).get();
         Assert.assertTrue("Build does not have MATLAB build environment", this.buildWrapper.getMatlabRootFolder().equalsIgnoreCase(buildTester.getMatlabRoot()));
     }
 
+    /*
+     * Verify if invalid MATLAB path throes error on console.
+     */
+    @Test
+    public void verifyInvalidPATHError() throws Exception {
+        this.buildWrapper.setMatlabRootFolder("/test/MATLAB/R2019a");
+        project.getBuildWrappersList().add(this.buildWrapper);
+        RunMatlabTestsBuilderTester buildTester = new RunMatlabTestsBuilderTester("","");
+        project.getBuildersList().add(buildTester);
+        project.scheduleBuild2(0).get();
+        FreeStyleBuild build = project.scheduleBuild2(0).get();
+        jenkins.assertLogContains("MatlabNotFoundError", build);
+    }
+    
     /*
      * Test To verify if UI  throws an error when MATLAB root is empty.
      *