Feature/improved docker tests (#74)

* Make sure the Ubuntu image is available before running tests (dependency)
* Check that the test report dir exists before exporting it.

Author: rasmusjelsgaard

Source/Public/Invoke-DockerTests.ps1

@@ -50,11 +50,15 @@ function Invoke-DockerTests {
     }
 
     $testReportPath = Join-Path $absoluteTestReportDir $TestReportName
+    $testReportExists = Test-Path -Path $testReportPath -PathType Leaf
+    if ($testReportExists) {
+        $testResult = $(ConvertFrom-Json $(Get-Content $testReportPath))
+    }
 
     $result = [PSCustomObject]@{
         # Todo: Need to check if the test report folder is missing.
         # It should not crash when folder is not there, but should simply return nothing
-        'TestResult'     = $(ConvertFrom-Json $(Get-Content $testReportPath))
+        'TestResult'     = $testResult
         'TestReportPath' = $testReportPath
         'CommandResult'  = $commandResult
         'ImageName'      = $ImageName

Test-Source/Invoke-DockerTests.Tests.ps1

@@ -9,6 +9,10 @@ Describe 'Run docker tests using Google Structure' {
 
     Context 'Running structure tests' {
 
+        BeforeAll {
+            Invoke-DockerPull -ImageName 'ubuntu' -Tag 'latest'
+        }
+
         BeforeEach {
             $script:backupLocation = Get-Location
             Set-Location $Global:TestDataDir
@@ -141,6 +145,7 @@ Describe 'Run docker tests using Google Structure' {
             $testResult.Fail | Should -Be 0
             $testResult.Results.Length | Should -Be 2
         }
+
     }
 
     Context 'Pipeline execution' {