Add some integration tests and runner

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

run_asm_tests.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+here="$(dirname "$0")"
+cd "$here"
+
+tests="./tests"
+
+RED="\e[31m"
+GREEN="\e[32m"
+RESET="\e[0m"
+
+# Build project
+cargo build
+
+find "$tests" -type f -name '*.asm' | \
+while read fname; do
+    test_name="$(basename "${fname%.asm}")"
+    printf "%s ... " "$test_name"
+    cargo run --quiet "$fname"
+    exit_code="$?"
+    if (( "$exit_code" == 0 )); then
+        echo -e "${GREEN}OK${RESET}"
+    else
+        echo -e "${RED}FAIL${RESET} ($exit_code)"
+    fi
+done