Update tab completion test for PowerShell

To avoid over-specify testing.

Author: matt9ucci

src/rustup-win-installer/msi/Completion.Tests.ps1

@@ -9,28 +9,13 @@ function Get-Result([string]$Text, [int]$CursorPosition = $Text.Length, [hashtab
 
 Describe 'rustup flags and subcommands' {
 	$result = Get-Result 'rustup '
-	$result.Count | Should Be 23
-	$result[00].CompletionText | Should Be 'completions'
-	$result[01].CompletionText | Should Be 'component'
-	$result[02].CompletionText | Should Be 'default'
-	$result[03].CompletionText | Should Be 'doc'
-	$result[04].CompletionText | Should Be '-h'
-	$result[05].CompletionText | Should Be 'help'
-	$result[06].CompletionText | Should Be '--help'
-	$result[07].CompletionText | Should Be 'install'
-	$result[08].CompletionText | Should Be 'override'
-	$result[09].CompletionText | Should Be 'run'
-	$result[10].CompletionText | Should Be 'self'
-	$result[11].CompletionText | Should Be 'set'
-	$result[12].CompletionText | Should Be 'show'
-	$result[13].CompletionText | Should Be 'target'
-	$result[14].CompletionText | Should Be 'telemetry'
-	$result[15].CompletionText | Should Be 'toolchain'
-	$result[16].CompletionText | Should Be 'uninstall'
-	$result[17].CompletionText | Should Be 'update'
-	$result[18].CompletionText | Should Be '-V'
-	$result[19].CompletionText | Should Be '-v'
-	$result[20].CompletionText | Should Be '--verbose'
-	$result[21].CompletionText | Should Be '--version'
-	$result[22].CompletionText | Should Be 'which'
+
+	# Keep it simple because over-specify testing might be risky
+	$result.Count | Should -BeGreaterThan 10
+	$result.CompletionText | Should -Contain 'completions'
+	$result.CompletionText | Should -Contain 'install'
+	$result.CompletionText | Should -Contain 'uninstall'
+	$result.CompletionText | Should -Contain 'update'
+	$result.CompletionText | Should -Contain '--help'
+	$result.CompletionText | Should -Contain '--verbose'
 }