Skip the iOS simulator terminate right after boot and bound the others

app-runner/Private/DeviceProviders/iOSSimulatorProvider.ps1

@@ -30,6 +30,7 @@ class iOSSimulatorProvider : DeviceProvider {
     [string]$SimulatorUUID = $null
     [string]$CurrentBundleId = $null
     [bool]$DidBootSimulator = $false
+    [bool]$FreshlyBooted = $false
 
     iOSSimulatorProvider() {
         $this.Platform = 'iOSSimulator'
@@ -61,6 +62,7 @@ class iOSSimulatorProvider : DeviceProvider {
         # Configure timeouts
         $this.Timeouts = @{
             'boot-timeout' = 60
+            'terminate-timeout' = 60
             'run-timeout' = 300
         }
     }
@@ -161,6 +163,7 @@ class iOSSimulatorProvider : DeviceProvider {
         $this.SimulatorUUID = $null
         $this.CurrentBundleId = $null
         $this.DidBootSimulator = $false
+        $this.FreshlyBooted = $false
     }
 
     [bool] TestConnection() {
@@ -258,21 +261,16 @@ class iOSSimulatorProvider : DeviceProvider {
 
         $startTime = Get-Date
 
+        # Terminate any previous instance to ensure a clean launch.
+        # This prevents stale processes from interfering with console-pty output capture.
+        $launchOptions = $this.PrepareLaunch($bundleId)
+
         # Build argument list for simctl launch
-        $simctlArgs = @("simctl", "launch", "--console-pty", $this.SimulatorUUID, $bundleId)
+        $simctlArgs = @("simctl", "launch", "--console-pty") + $launchOptions + @($this.SimulatorUUID, $bundleId)
         if ($Arguments -and $Arguments.Count -gt 0) {
             $simctlArgs += $Arguments
         }
 
-        # Terminate any previous instance to ensure a clean launch.
-        # This prevents stale processes from interfering with console-pty output capture.
-        try {
-            & xcrun simctl terminate $this.SimulatorUUID $bundleId 2>&1 | Out-Null
-        }
-        catch {
-            # App may not be running - that's fine
-        }
-
         Write-Host "Launching: $bundleId" -ForegroundColor Cyan
         if ($Arguments -and $Arguments.Count -gt 0) {
             Write-Host "  Arguments: $($Arguments -join ' ')" -ForegroundColor Cyan
@@ -301,11 +299,8 @@ class iOSSimulatorProvider : DeviceProvider {
                 # Terminate the app on the simulator to ensure proper cleanup.
                 # This is important after crashes where the app process may have died
                 # but the console-pty connection keeps xcrun alive.
-                try {
-                    & xcrun simctl terminate $this.SimulatorUUID $bundleId 2>&1 | Out-Null
-                }
-                catch {
-                    Write-Debug "$($this.Platform): terminate after timeout failed (app may already be terminated): $_"
+                if (-not $this.TerminateApp($bundleId)) {
+                    Write-Warning "$($this.Platform): terminate after timeout did not finish within $($this.Timeouts['terminate-timeout']) seconds"
                 }
                 Start-Sleep -Seconds 1
 
@@ -454,9 +449,54 @@ class iOSSimulatorProvider : DeviceProvider {
         return $this.CreateSessionInfo()
     }
 
+    # Helper: Return the extra `simctl launch` options that guarantee a fresh app process
+    hidden [string[]] PrepareLaunch([string]$bundleId) {
+        # Nothing of ours runs on a simulator we just booted, and terminating right after boot can stall for minutes.
+        if ($this.FreshlyBooted) {
+            $this.FreshlyBooted = $false
+            return @()
+        }
+
+        if ($this.TerminateApp($bundleId)) {
+            return @()
+        }
+
+        Write-Warning "$($this.Platform): simctl terminate did not finish within $($this.Timeouts['terminate-timeout']) seconds, letting launch terminate the app instead"
+        return @('--terminate-running-process')
+    }
+
+    # Helper: Terminate the app; returns $false if simctl did not finish in time (a not-running app is fine)
+    hidden [bool] TerminateApp([string]$bundleId) {
+        return $this.InvokeXcrun(@('simctl', 'terminate', $this.SimulatorUUID, $bundleId), $this.Timeouts['terminate-timeout'])
+    }
+
+    # Helper: Run xcrun, discarding its output; returns $false and kills it if it does not exit within $timeoutSeconds
+    hidden [bool] InvokeXcrun([string[]]$arguments, [int]$timeoutSeconds) {
+        $outFile = New-TemporaryFile
+        $errFile = New-TemporaryFile
+        try {
+            $process = Start-Process 'xcrun' `
+                -ArgumentList $arguments `
+                -NoNewWindow -PassThru `
+                -RedirectStandardOutput $outFile `
+                -RedirectStandardError $errFile
+
+            if ($process.WaitForExit($timeoutSeconds * 1000)) {
+                return $true
+            }
+            $process | Stop-Process -Force -ErrorAction SilentlyContinue
+            return $false
+        }
+        finally {
+            Remove-Item $outFile -ErrorAction SilentlyContinue
+            Remove-Item $errFile -ErrorAction SilentlyContinue
+        }
+    }
+
     # Helper: Boot the simulator with graceful handling
     hidden [void] BootSimulator() {
         Write-Debug "$($this.Platform): Booting simulator: $($this.SimulatorUUID)"
+        $this.FreshlyBooted = $false
 
         try {
             $this.InvokeCommand('boot', @($this.SimulatorUUID))
@@ -478,6 +518,7 @@ class iOSSimulatorProvider : DeviceProvider {
             if ($state -eq 'Booted') {
                 Write-Host "Simulator booted successfully" -ForegroundColor Green
                 $this.DidBootSimulator = $true
+                $this.FreshlyBooted = $true
                 return
             }
             Start-Sleep -Seconds 1

app-runner/Tests/iOSSimulatorRunApplication.Tests.ps1

@@ -0,0 +1,110 @@
+$ErrorActionPreference = 'Stop'
+
+BeforeDiscovery {
+    $skip = -not $IsMacOS -or -not (Get-Command 'xcrun' -ErrorAction SilentlyContinue)
+}
+
+BeforeAll {
+    . "$PSScriptRoot\..\Private\DeviceProviders\DeviceProvider.ps1"
+    . "$PSScriptRoot\..\Private\DeviceProviders\iOSSimulatorProvider.ps1"
+
+    Invoke-Expression @'
+class FakeiOSSimulatorProvider : iOSSimulatorProvider {
+    [System.Collections.Generic.List[string]]$Calls = [System.Collections.Generic.List[string]]::new()
+    [bool]$TerminateHangs = $false
+    [bool]$AlreadyBooted = $false
+
+    FakeiOSSimulatorProvider() : base() {
+        $this.SimulatorUUID = 'E952A9B0-CC78-435C-BF08-06AD47FE1076'
+    }
+
+    [bool] InvokeXcrun([string[]]$arguments, [int]$timeoutSeconds) {
+        $this.Calls.Add($arguments[1])
+        return -not ($this.TerminateHangs -and $arguments[1] -eq 'terminate')
+    }
+
+    [object] InvokeCommand([string]$action, [object[]]$parameters) {
+        $this.Calls.Add($action)
+        switch ($action) {
+            'boot' { if ($this.AlreadyBooted) { throw 'Unable to boot device in current state: Booted' } }
+            'list-devices' { return "    iPhone 17 Pro ($($this.SimulatorUUID)) (Booted)" }
+        }
+        return $null
+    }
+
+    [int] TerminateCount() {
+        return @($this.Calls | Where-Object { $_ -eq 'terminate' }).Count
+    }
+}
+'@
+}
+
+Describe 'iOSSimulatorProvider.PrepareLaunch' -Tag 'Unit' -Skip:$skip {
+    It 'Skips terminate on the first launch after a boot only' {
+        $provider = [FakeiOSSimulatorProvider]::new()
+        $provider.StartDevice() | Out-Null
+
+        $provider.PrepareLaunch('com.example.app') | Should -BeNullOrEmpty
+        $provider.TerminateCount() | Should -Be 0
+
+        $provider.PrepareLaunch('com.example.app') | Should -BeNullOrEmpty
+        $provider.TerminateCount() | Should -Be 1
+    }
+
+    It 'Skips terminate again after the simulator was restarted' {
+        $provider = [FakeiOSSimulatorProvider]::new()
+        $provider.StartDevice() | Out-Null
+        $provider.PrepareLaunch('com.example.app') | Out-Null
+        $provider.PrepareLaunch('com.example.app') | Out-Null
+
+        $provider.RestartDevice()
+        $provider.PrepareLaunch('com.example.app') | Out-Null
+
+        $provider.TerminateCount() | Should -Be 1
+    }
+
+    It 'Terminates on the first launch when the simulator was already booted' {
+        $provider = [FakeiOSSimulatorProvider]::new()
+        $provider.AlreadyBooted = $true
+        $provider.StartDevice() | Out-Null
+
+        $provider.PrepareLaunch('com.example.app') | Out-Null
+
+        $provider.TerminateCount() | Should -Be 1
+    }
+
+    It 'Forgets the fresh boot on disconnect' {
+        $provider = [FakeiOSSimulatorProvider]::new()
+        $provider.StartDevice() | Out-Null
+
+        $provider.Disconnect()
+
+        $provider.FreshlyBooted | Should -BeFalse
+    }
+
+    It 'Lets launch terminate the app when terminate does not finish' {
+        $provider = [FakeiOSSimulatorProvider]::new()
+        $provider.TerminateHangs = $true
+
+        $options = $provider.PrepareLaunch('com.example.app') 3>$null
+
+        $options | Should -Be @('--terminate-running-process')
+    }
+}
+
+Describe 'iOSSimulatorProvider.InvokeXcrun' -Tag 'Unit' -Skip:$skip {
+    It 'Stops a command that does not exit in time' {
+        $provider = [iOSSimulatorProvider]::new()
+        $start = Get-Date
+
+        $provider.InvokeXcrun(@('sleep', '30'), 1) | Should -BeFalse
+
+        ((Get-Date) - $start).TotalSeconds | Should -BeLessThan 10
+    }
+
+    It 'Returns true when the command exits, whatever its exit code' {
+        $provider = [iOSSimulatorProvider]::new()
+
+        $provider.InvokeXcrun(@('false'), 10) | Should -BeTrue
+    }
+}