[patch] zip tests

[Cristian Ionescu-Idbohrn]

Moves common parts of the tests to compressfuncts.sh (new).
Adds a new test: zcat.tests.


Cheers,

-- 
Cristian
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#!/bin/sh -e

app=zcat
bb_app="busybox $app"
ext=gz
wdir=testdir

. compressfuncs.sh

rm -rf $wdir
mkdir -p $wdir
(
cd $wdir || { echo "cannot cd $wdir!"; exit 1; }

expected="HELLO\nok\n"
prep
check "$app: dont delete src" "$bb_app t2.gz; test -f t2.gz && echo ok"
)
rm -rf $wdir