Update tests to work with pester version 4.* (ScoopInstaller#1711)

* Remove custom choco options
* Use Install-Module to install Pester

appveyor.yml

@@ -6,8 +6,7 @@ branches:
 
 init:
   - ps: (get-psprovider 'FileSystem').Home = $(pwd)
-  - ps: "if($env:APPVEYOR_CHOCO_PESTER_OPTIONS -ne $null) { write-host -f yellow 'NOTE: customized `pester` installation is being used' }"
-  - ps: choco install -y pester $env:APPVEYOR_CHOCO_PESTER_OPTIONS
+  - ps: Install-Module -Name Pester -Repository PSGallery -Force
 
 build: off
 

test/Scoop-Alias.Tests.ps1

@@ -27,7 +27,7 @@ describe "add_alias" {
       $alias_file | should exist
 
       add_alias "rm" "test"
-      $alias_file | should contain ""
+      $alias_file | should FileContentMatch ""
     }
   }
 }

test/Scoop-Core.Tests.ps1

@@ -35,28 +35,28 @@ describe "movedir" {
         $dir = "$working_dir\user"
         movedir "$dir\_tmp\$extract_dir" "$dir\$extract_to"
 
-        "$dir\test.txt" | should contain "this is the one"
+        "$dir\test.txt" | should FileContentMatch "this is the one"
         "$dir\_tmp\$extract_dir" | should not exist
     }
 
     it "moves directories with spaces in path" -skip:$isUnix {
         $dir = "$working_dir\user with space"
         movedir "$dir\_tmp\$extract_dir" "$dir\$extract_to"
 
-        "$dir\test.txt" | should contain "this is the one"
+        "$dir\test.txt" | should FileContentMatch "this is the one"
         "$dir\_tmp\$extract_dir" | should not exist
 
         # test trailing \ in from dir
         movedir "$dir\_tmp\$null" "$dir\another"
-        "$dir\another\test.txt" | should contain "testing"
+        "$dir\another\test.txt" | should FileContentMatch "testing"
         "$dir\_tmp" | should not exist
     }
 
     it "moves directories with quotes in path" -skip:$isUnix {
         $dir = "$working_dir\user with 'quote"
         movedir "$dir\_tmp\$extract_dir" "$dir\$extract_to"
 
-        "$dir\test.txt" | should contain "this is the one"
+        "$dir\test.txt" | should FileContentMatch "this is the one"
         "$dir\_tmp\$extract_dir" | should not exist
     }
 }