More print-to-pipe error checking in tests.

src/tests/network-no-diff.test

@@ -23,10 +23,8 @@ baseline()
 {
     # Generate updates that don't change the screen
     i=0
-    while [ $i -lt 10 ]; do
-	printf 'x\b'
+    while [ $i -lt 10 ] && printf 'x\b' && sleep 1; do
 	i=$((i + 1))
-	sleep 1
     done
 }
 

src/tests/prediction-unicode.test

@@ -52,8 +52,8 @@ tmux_commands()
     sleep 1
     printf "send-keys 0x04\n"
     # This will get killed by SIGPIPE.
-    while printf "show-options\n"; do
-	sleep 1
+    while printf "show-options\n" && sleep 1; do
+	:
     done
 } 
 

src/tests/pty-deadlock.test

@@ -36,8 +36,8 @@ tmux_commands()
     # And stop the test script, so it produces its exit messge.
     printf "send-keys 0x0d\n"
     # This will get killed by SIGPIPE.
-    while printf "show-options\n"; do
-	sleep 1
+    while printf "show-options\n" && sleep 1; do
+	:
     done
 }
 
@@ -55,8 +55,8 @@ baseline()
 	       printf 'a\nb\nc\nd\ne\nf\ng\nh\ni\nj\nk\nl\nm\nn\no\np\nq\nr\ns\nt\nu\nv\nw\nx\ny\nz\n'
 	   done)
     read -r x
-    while true; do
-	printf '%s' "$blat"
+    while printf '%s' "$blat"; do
+	:
     done &
     printpid=$!
     (sleep 120; kill $$ $printpid) &

src/tests/repeat.test

@@ -51,8 +51,8 @@ server()
 # Constantly send keyboard input.
 tmux_commands()
 {
-    while printf "send-keys 0x0d\n"; do
-	sleepf
+    while printf "send-keys 0x0d\n" && sleepf; do
+	:
     done
 }