def METHOD_NAME(self, ctx):
    # Issue command "config fabric port isolate 0",
    # check if the result is expected.
    result = self.basic_check("port", ["isolate", "0"], ctx)
    expect_result = 0
    assert operator.eq(result.exit_code, expect_result)
    # Issue command "config fabric port isolate 1",
    # check if the result has the error message as port 1 is not in use.
    result = self.basic_check("port", ["isolate", "1"], ctx)
    assert "Port 1 is not in use" in result.output
    # Issue command "config fabric port unisolate 0",
    # check if the result is expected.
    result = self.basic_check("port", ["unisolate", "0"], ctx)
    expect_result = 0
    assert operator.eq(result.exit_code, expect_result)
    # Issue command "config fabric port unisolate 1",
    # check if the result has the error message as port 1 is not in use.
    result = self.basic_check("port", ["unisolate", "1"], ctx)
    assert "Port 1 is not in use" in result.output