Add testing scripts

https://github.com/Lorenzooone/mgba/tree/sdl_logging

test.ps1

@@ -0,0 +1,42 @@
+$test_rom_file = "bin/m12test.gba"
+$log_file      = "bin/test.log"
+$sleep_time    = 10
+$failure_text  = "FAIL"
+$end_text      = "Done!"
+$mgba_name     = "mgba-sdl"
+
+If     ($IsWindows)            { $mgba_cmd = "bin/$mgba_name.exe" }
+ElseIf ($IsLinux -or $IsMacOS) { $mgba_cmd = "bin/$mgba_name" }
+
+"Building the test ROM..."
+.\build.ps1 -t
+if ($LASTEXITCODE -ne 0) { exit -1 }
+Remove-Item -Path $log_file
+
+"Starting the emulator..."
+& $mgba_cmd -l 16 -C logToFile=1 -C logFile=$log_file $test_rom_file &
+if ($LASTEXITCODE -ne 0) { exit -1 }
+
+"Sleeping for $sleep_time seconds..."
+Start-Sleep $sleep_time
+
+"Closing the emulator..."
+Stop-Process -Name $mgba_name
+if ($LASTEXITCODE -ne 0) { exit -1 }
+
+$fails = Select-String -Path $log_file -Pattern $failure_text
+if ($fails.count -ne 0) {
+    "Test failures:"
+    $fails
+    exit -1
+}
+
+$end_session = Select-String -Path $log_file -Pattern $end_text
+if ($end_session.count -eq 0) {
+    "The tests did not run to completion!"
+    exit -1
+}
+
+"No failures!"
+
+exit 0