What is the difference between step vs steps in jenkinsfile?

[red 888]

I'm trying to run xunit and I keep seeing examples with only "step" like 
this:


step([$class : 'XUnitPublisher', testTimeMargin: '3000', thresholdMode: 1,
    thresholds: [
        [$class: 'FailedThreshold', failureNewThreshold: '', failureThreshold: 
'', unstableNewThreshold: '', unstableThreshold: '0'],
        [$class: 'SkippedThreshold', failureNewThreshold: '', failureThreshold: 
'', unstableNewThreshold: '', unstableThreshold: '']
 ],
    tools : [[$class: 'MSTestJunitHudsonTestType', deleteOutputFiles: true, 
failIfNotNew: false, pattern: "TestResults\\*.trx", skipNoTestFiles: false, 
stopProcessingIfError: true]]])


But I want to run multiple "steps" inside a stage. I don't understand step 
vs steps.


For example this isn't working:

stage('Test') {
    steps {
        bat "\"${tool 'VSTestRunner'}\" 
%WORKSPACE%\\MyApp\\bin\\Debug\\MyAppTest.dll /logger:trx",
        step([$class : 'XUnitPublisher',
            testTimeMargin: '3000',
            thresholdMode: 1,
            thresholds: [
                [$class: 'FailedThreshold', failureNewThreshold: '', 
failureThreshold: '', unstableNewThreshold: '', unstableThreshold: '0'],
                [$class: 'SkippedThreshold', failureNewThreshold: '', 
failureThreshold: '', unstableNewThreshold: '', unstableThreshold: '']
            ],
            tools : [[$class: 'MSTestJunitHudsonTestType',
                deleteOutputFiles: true,
                failIfNotNew: false,
                pattern: "TestResults\\*.trx",
                skipNoTestFiles: false,
                stopProcessingIfError: true
            ]]
        ])
    }}

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