用法:
test.support.captured_stdin()
test.support.captured_stdout()
test.support.captured_stderr()
用
io.StringIO
對象臨時替換命名流的上下文管理器。與輸出流一起使用的示例:
with captured_stdout() as stdout, captured_stderr() as stderr: print("hello") print("error", file=sys.stderr) assert stdout.getvalue() == "hello\n" assert stderr.getvalue() == "error\n"
與輸入流一起使用的示例:
with captured_stdin() as stdin: stdin.write('hello\n') stdin.seek(0) # call test code that consumes from sys.stdin captured = input() self.assertEqual(captured, "hello")
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