Add en passant santization tests to the CI and pos is ok

closes https://github.com/official-stockfish/Stockfish/pull/6615

No functional change

tests/testing.py

@@ -126,6 +126,11 @@ class TimeoutException(Exception):
         self.message = message
         self.timeout = timeout
 
+class UnexpectedOutputException(Exception):
+    def __init__(self, actual: str, expected: str):
+        self.actual   = actual
+        self.expected = expected
+
 
 def timeout_decorator(timeout: float):
     def decorator(func):
@@ -230,6 +235,11 @@ class MiniTestFramework:
                     f" {method} (hit execution limit of {e.timeout} seconds)"
                 )
 
+            if isinstance(e, UnexpectedOutputException):
+                self.print_failure(
+                    f" {method} encountered unexpeted output: \"{e.actual}\" when output matching \"{e.expected}\" was expected"
+                )
+
             if isinstance(e, AssertionError):
                 self.__handle_assertion_error(t0, method)
 
@@ -371,6 +381,15 @@ class Stockfish:
             if callback(line) == True:
                 return
 
+    @timeout_decorator(MAX_TIMEOUT)    
+    def expect_for_line_matching(self, line_match: str, expected: str):
+        for line in self.readline():
+            if fnmatch.fnmatch(line, line_match):
+                if fnmatch.fnmatch(line, expected):
+                    break
+                else:
+                    raise UnexpectedOutputException(line, expected)
+
     def readline(self):
         if not self.process:
             raise RuntimeError("Stockfish process is not started")