Added primitive unit testing in tests/

tests/test.sh

@@ -0,0 +1,20 @@
+#!/bin/bash
+
+for file in *.c
+do
+    filebase=$(basename $file | sed 's/\.c$//')
+    compile_def=$(cat <<EOF
+function shunittest_compile_${filebase} {
+    set -e ; make ${filebase}.elf >&2 ; test -e ${filebase}.elf ; set +e
+}
+EOF
+)
+    eval "$compile_def"
+    run_def=$(cat <<EOF
+function shunittest_run_${filebase} {
+    set -e ; ./${filebase}.elf >&2 ; set +e
+}
+EOF
+)
+    eval "$run_def"
+done