randomtest fixes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

testsuite/du/du-h-works

@@ -1,6 +1,4 @@
 # FEATURE: CONFIG_FEATURE_HUMAN_READABLE
 
-d=/bin
-du -h "$d" > logfile.gnu
-busybox du -h "$d" > logfile.bb
-cmp logfile.gnu logfile.bb
+dd if=/dev/zero of=file bs=1M count=1 2>/dev/null
+test x"`busybox du -h .`" = x"1.0M	."

testsuite/du/du-k-works

@@ -1,4 +1,4 @@
-d=/bin
-du -k "$d" > logfile.gnu
-busybox du -k "$d" > logfile.bb
-cmp logfile.gnu logfile.bb
+dd if=/dev/zero of=file1 bs=1k count=64 2>/dev/null
+dd if=/dev/zero of=file2 bs=1k count=16 2>/dev/null
+test x"`busybox du -k .`" = x"80	." \
+  -o x"`busybox du -k .`" = x"88	." \

testsuite/du/du-l-works

@@ -1,6 +1,8 @@
 # FEATURE: CONFIG_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
 
-d=/bin
-du -l "$d" > logfile.gnu
-busybox du -l "$d" > logfile.bb
-cmp logfile.gnu logfile.bb
+dd if=/dev/zero of=file1 bs=1k count=64 2>/dev/null
+ln file1 file1.1
+dd if=/dev/zero of=file2 bs=1k count=16 2>/dev/null
+test x"`busybox du -l .`" = x"144	." \
+  -o x"`busybox du -l .`" = x"148	." \
+  -o x"`busybox du -l .`" = x"152	." \

testsuite/du/du-m-works

@@ -1,6 +1,4 @@
 # FEATURE: CONFIG_FEATURE_HUMAN_READABLE
 
-d=/bin
-du -m "$d" > logfile.gnu
-busybox du -m "$d" > logfile.bb
-cmp logfile.gnu logfile.bb
+dd if=/dev/zero of=file bs=1M count=1 2>/dev/null
+test x"`busybox du -m .`" = x"1	."

testsuite/du/du-s-works

@@ -3,4 +3,6 @@
 d=/bin
 du -s "$d" > logfile.gnu
 busybox du -s "$d" > logfile.bb
-cmp logfile.gnu logfile.bb
+cmp logfile.gnu logfile.bb && exit 0
+diff -u logfile.gnu logfile.bb
+exit 1

testsuite/du/du-works

@@ -3,4 +3,6 @@
 d=/bin
 du "$d" > logfile.gnu
 busybox du "$d" > logfile.bb
-cmp logfile.gnu logfile.bb
+cmp logfile.gnu logfile.bb && exit 0
+diff -u logfile.gnu logfile.bb
+exit 1