first cut at very simple tester

tester/run-tests.sh

@@ -0,0 +1,49 @@
+#! /usr/bin/env bash
+
+# run_test test_number
+run_test () {
+    testfile=tests/$1.run
+    # cat $testfile
+    $(cat $testfile) > tests-out/$1.out 2> tests-out/$1.err
+    return 0
+}
+
+# check_test test_number out/err
+check_test () {
+    outdiff=$(diff tests/$1.$2 tests-out/$1.$2)
+    outerr=$?
+    if (( $outerr != 0 )); then
+	builtin echo -e "\e[31mtest $testnum: standard $2 incorrect\e[0m"
+	echo "should be:"
+	cat tests/$1.$2
+	echo "is:"
+	cat tests-out/$1.$2
+	exit 1
+    fi
+    return 0
+}
+
+(( testnum = 1 ))
+
+while true; do
+    if [[ ! -f tests/$testnum.run ]]; then
+	exit 0
+    fi
+    run_test $testnum
+    check_test $testnum out
+    check_test $testnum err
+    builtin echo -e "\e[32mtest $testnum: passed\e[0m"
+    (( testnum = $testnum + 1 ))
+done
+
+exit 0
+
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