Expected a value, but got $null or empty. at <ScriptBlock>, /home/mark/Documents/Projects/PSClassUtils/Tests/ClassUtils.Write-CUClassDiagram.Tests.ps1: line 136 136: $a -cmatch '"Woop" \[label=.*' | should not benullOrEmpty Expected a value, but got $null or empty. at <ScriptBlock>, /home/mark/Documents/Projects/PSClassUtils/Tests/ClassUtils.Write-CUClassDiagram.Tests.ps1: line 191 191: $b -cmatch '"Woop" \[label=.*' | should Not beNullOrEmpty