basic byte and numeric sort

tests for numeric sort

test/sort.rs

@@ -0,0 +1,46 @@
+use std::io::process::Command;
+use std::io::File;
+use std::string::String;
+
+static PROGNAME: &'static str = "./sort";
+
+#[test]
+fn numeric1() {
+    numeric_helper(1);
+}
+
+#[test]
+fn numeric2() {
+    numeric_helper(2);
+}
+
+#[test]
+fn numeric3() {
+    numeric_helper(3);
+}
+
+#[test]
+fn numeric4() {
+    numeric_helper(4);
+}
+
+#[test]
+fn numeric5() {
+    numeric_helper(5);
+}
+
+fn numeric_helper(test_num: int) {
+    let mut cmd = Command::new(PROGNAME);
+    cmd.arg("-n");
+    let po = match cmd.clone().arg(format!("{}{}{}", "numeric", test_num, ".txt")).output() {
+        Ok(p) => p,
+        Err(err) => fail!("{}", err),
+    };
+
+    let answer = match File::open(&Path::new(format!("{}{}{}", "numeric", test_num, ".ans")))
+            .read_to_end() {
+        Ok(answer) => answer,
+        Err(err) => fail!("{}", err),
+    };
+    assert_eq!(String::from_utf8(po.output), String::from_utf8(answer));
+}