simplify tests for latest shelltestrunner

tests/add-bad-date-fails.test

@@ -1,4 +1,4 @@
-# ignore the binary we are invoked with
--f/dev/null; echo "2009/1/32" | hledger add 2>&1 | sed -e's/\[[^]]*\]//g' | grep -q 'date : date :'
->>>=
-0
+add
+<<<
+2009/1/32
+>>>2 /date .*: date .*/

tests/add-blank-date.test

@@ -1,4 +1,4 @@
-# ignore the binary we are invoked with
--f/dev/null; echo | hledger add 2>&1 |sed -e's/\[[^]]*\]//g' | grep -q 'date : description:'
->>>=
-0
+add
+<<<
+
+>>>2 /date .*: description/

tests/add-blank-description-fails.test

@@ -1,4 +1,6 @@
-# ignore the binary we are invoked with
--f/dev/null; printf "\n\n" | hledger add 2>&1 | sed -e's/\[[^]]*\]//g' | grep -q 'date : description: description:'
->>>=
-0
+add
+<<<
+
+
+>>>2 /date .*: description: description:/
+