From 2d6d1ca67f4f5c8c9dbf40b24675810a6e778c78 Mon Sep 17 00:00:00 2001
From: AnotherTest <ali.mpfard@gmail.com>
Date: Mon, 26 Oct 2020 21:05:12 +0330
Subject: [PATCH] Shell: Add some basic tests for backgrounding

---
 Shell/Tests/backgrounding.sh | 53 ++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 Shell/Tests/backgrounding.sh

diff --git a/Shell/Tests/backgrounding.sh b/Shell/Tests/backgrounding.sh
new file mode 100644
index 0000000000..08a78b53fc
--- /dev/null
+++ b/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
+