Shell: Add some basic tests for backgrounding

Shell/Tests/backgrounding.sh

@@ -0,0 +1,53 @@
+#!/bin/Shell
+
+setopt --verbose
+
+fail(msg) {
+ echo FAIL: $msg
+ exit 1
+}
+
+last_idx=''
+block_idx=0
+block() {
+ block_idx=$(expr 1 + $block_idx)
+ last_idx=$block_idx
+ mkfifo fifo$block_idx
+ cat fifo$block_idx&
+}
+
+unblock(idx) {
+ echo unblock $idx > fifo$idx
+ rm -f fifo$idx
+}
+
+assert_job_count(count) {
+ ecount=$(jobs | wc -l)
+ shift
+ if test $ecount -ne $count {
+ for $* {
+ unblock $it
+ }
+ fail "expected $ecount == $count"
+ }
+}
+
+block
+i=$last_idx
+
+assert_job_count 1 $i
+
+unblock $i
+wait
+
+block
+i=$last_idx
+block
+j=$last_idx
+
+assert_job_count 2 $i $j
+
+unblock $i
+unblock $j
+wait
+