Implement script to prepare packages with Node.js

tests/Node.Tests.ps1

@@ -0,0 +1,46 @@
+param (
+    [Version] [Parameter (Mandatory = $true)] [ValidateNotNullOrEmpty()]
+    $Version
+)
+
+Import-Module (Join-Path $PSScriptRoot "../helpers/packages-generation/pester-extensions.psm1")
+
+function Get-UseNodeLogs {
+    $logsFolderPath = Join-Path -Path $env:AGENT_HOMEDIRECTORY -ChildPath "_diag" | Join-Path -ChildPath "pages"
+
+    $useNodeLogFile = Get-ChildItem -Path $logsFolderPath | Where-Object {
+        $logContent = Get-Content $_.Fullname -Raw
+        return $logContent -match "Use Node"
+    } | Select-Object -First 1
+    return $useNodeLogFile.Fullname
+}
+
+Describe "Node.js" {
+    It "is available" {
+        "node --version" | Should -ReturnZeroExitCode
+    }
+
+    It "version is correct" {
+        $versionOutput = Invoke-Expression "node --version"
+        $versionOutput | Should -Match $Version
+    }
+
+    It "is used from tool-cache" {
+        $nodePath = (Get-Command "node").Path
+        $nodePath | Should -Not -BeNullOrEmpty
+        $expectedPath = Join-Path -Path $env:AGENT_TOOLSDIRECTORY -ChildPath "node"
+        $nodePath.startsWith($expectedPath) | Should -BeTrue -Because "'$nodePath' is not started with '$expectedPath'"
+    }
+
+    It "cached version is used without downloading" {
+        # Analyze output of previous steps to check if Node.js was consumed from cache or downloaded
+        $useNodeLogFile = Get-UseNodeLogs
+        $useNodeLogFile | Should -Exist
+        $useNodeLogContent = Get-Content $useNodeLogFile -Raw
+        $useNodeLogContent | Should -Match "Found tool in cache"
+    }
+
+    It "Run simple code" {
+        "node ./simple-test.js" | Should -ReturnZeroExitCode
+    }
+}

tests/simple-test.js

@@ -0,0 +1,15 @@
+function fibonacci(num){
+    var a = 1, b = 0, temp;
+  
+    while (num >= 0){
+        temp = a;
+        a = a + b;
+        b = temp;
+        num--;
+    }
+  
+    return b;
+}
+
+console.log(fibonacci(7));
+console.log(fibonacci(23));