fix: tests

Author: BobTheBuidler

mypyc/test-data/fixtures/ir.py

@@ -173,6 +173,8 @@ def __getitem__(self, i: slice) -> bytes: ...
     def join(self, x: Iterable[object]) -> bytes: ...
     def decode(self, x: str=..., y: str=...) -> str: ...
     def __iter__(self) -> Iterator[int]: ...
+    def ljust(self, width: int, fillchar: bytes) -> bytes: ...
+    def rjust(self, width: int, fillchar: bytes) -> bytes: ...
 
 class bytearray:
     @overload

mypyc/test-data/run-bytes.test

@@ -376,6 +376,8 @@ class bytes:
     pass
 
 [case testBytesRjustLjust]
+from testutil import assertRaises
+
 def rjust_bytes(b: bytes, width: int, fill: bytes = b' ') -> bytes:
     return b.rjust(width, fill)