add up.sh to test suite

up.sh tests the scroll up by one page feature

Makefile

@@ -20,6 +20,7 @@ test: scroll ptty
 	# check exit passthrough of child
 	if ! ./ptty ./scroll true;  then exit 1; fi
 	if   ./ptty ./scroll false; then exit 1; fi
+	./up.sh
 
 clean:
 	rm -f scroll ptty

up.log

@@ -0,0 +1,74 @@
+1
+2
+3
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+[?25l1
+2
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+25


up.sh

@@ -11,3 +11,5 @@ done > tmp.log
 
 (sleep 1; printf "\033[5;2~"; sleep 1; ) \
 	| ./ptty ./scroll tail -fn 50 tmp.log > out.log
+
+cmp out.log up.log