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For Write & Edit Test,
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The combanation of ID(1) and ID(2) should work.
The combanation of ID(1) and ID(3) or The combanation of ID(2) and ID(3)
should result a empty string in either of both of the pair.
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For Delete Test,
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Any combanaiton should work.
If it ever fails, it should display the following message and stop the execution.

echo "***********************\n".
	"Current file length(".strlen($txt).") is not ".
	($sample_len*10)."!!!\n".
	"***********************\n";
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OneFile Test
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CSfCacheのhashタイプを、存在しないタイプ("one-file")に設定してある。
この場合、キャッシュ・ファイル名はckeyに依存せず、すべてのデーターは
(cname).one-file.cacheに書き込まれる。
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