Add initial tests.

Makefile

@@ -188,7 +188,8 @@ TEST_PROGS  := \
   truncate \
   tsort \
   unlink \
-  unexpand
+  unexpand \
+  wc
 
 TEST        ?= $(TEST_PROGS)
 

test/fixtures/wc/alice_in_wonderland.txt

@@ -0,0 +1,5 @@
+Alice was beginning to get very tired of sitting by
+her sister on the bank, and of having nothing to do: once or twice
+she had peeped into the book her sister was reading, but it had no
+pictures or conversations in it, "and what is the use of a book,"
+thought Alice "without pictures or conversation?"

test/fixtures/wc/lorem_ipsum.txt

@@ -0,0 +1,13 @@
+Lorem ipsum dolor sit amet, consectetur adipiscing
+elit.  Nunc interdum suscipit sem vel ornare. Proin euismod, justo
+sed mollis dictum, eros urna ultricies augue, eu pharetra mi ex id
+ante. Duis convallis porttitor aliquam. Nunc vitae tincidunt ex.
+Suspendisse iaculis ligula ac diam consectetur lacinia. Donec vel
+velit dui. Etiam fringilla, dolor quis tempor vehicula, lacus
+turpis bibendum velit, et pellentesque elit odio a magna.  Cras
+vulputate tortor non libero vehicula euismod. Aliquam tincidunt
+nisl eget enim cursus, viverra sagittis magna commodo. Cras rhoncus
+egestas leo nec blandit.  Suspendisse potenti. Etiam ullamcorper
+leo vel lacus vestibulum, cursus semper eros efficitur. In hac
+habitasse platea dictumst.  Phasellus scelerisque vehicula
+fringilla.

test/fixtures/wc/moby_dick.txt

@@ -0,0 +1,18 @@
+Call me Ishmael. Some years ago - never mind how long
+precisely - having little or no money in my purse, and nothing
+particular to interest me on shore, I thought I would sail about a
+little and see the watery part of the world. It is a way I have of
+driving off the spleen and regulating the circulation. Whenever I
+find myself growing grim about the mouth; whenever it is a damp,
+drizzly November in my soul; whenever I find myself involuntarily
+pausing before coffin warehouses, and bringing up the rear of every
+funeral I meet; and especially whenever my hypos get such an upper
+hand of me, that it requires a strong moral principle to prevent me
+from deliberately stepping into the street, and methodically
+knocking people's hats off - then, I account it high time to get to
+sea as soon as I can.  This is my substitute for pistol and ball.
+With a philosophical flourish Cato throws himself upon his sword; I
+quietly take to the ship. There is nothing surprising in this. If
+they but knew it, almost all men in their degree, some time or
+other, cherish very nearly the same feelings towards the ocean with
+me.

test/wc.rs

@@ -0,0 +1,57 @@
+use std::process::Command;
+use util::*;
+
+static PROGNAME: &'static str = "./wc";
+
+#[path = "common/util.rs"]
+#[macro_use]
+mod util;
+
+#[test]
+fn test_stdin_default() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run_piped_stdin(&mut cmd, get_file_contents("lorem_ipsum.txt"));
+    assert_eq!(result.stdout, "  13 109 772\n");
+}
+
+#[test]
+fn test_stdin_only_bytes() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run_piped_stdin(&mut cmd.args(&["-c"]), get_file_contents("lorem_ipsum.txt"));
+    assert_eq!(result.stdout, " 772\n");
+}
+
+#[test]
+fn test_stdin_all_counts() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run_piped_stdin(&mut cmd.args(&["-c", "-m", "-l", "-L", "-w"]), get_file_contents("alice_in_wonderland.txt"));
+    assert_eq!(result.stdout, "   5  57 302 302  66\n");
+}
+
+#[test]
+fn test_single_default() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.arg("moby_dick.txt"));
+    assert_eq!(result.stdout, "   18  204 1115 moby_dick.txt\n");
+}
+
+#[test]
+fn test_single_only_lines() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.args(&["-l", "moby_dick.txt"]));
+    assert_eq!(result.stdout, "   18 moby_dick.txt\n");
+}
+
+#[test]
+fn test_single_all_counts() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.args(&["-c", "-l", "-L", "-m", "-w", "alice_in_wonderland.txt"]));
+    assert_eq!(result.stdout, "   5  57 302 302  66 alice_in_wonderland.txt\n");
+}
+
+#[test]
+fn test_multiple_default() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.args(&["lorem_ipsum.txt", "moby_dick.txt", "alice_in_wonderland.txt"]));
+    assert_eq!(result.stdout, "   13  109  772 lorem_ipsum.txt\n   18  204 1115 moby_dick.txt\n    5   57  302 alice_in_wonderland.txt\n   36  370 2189 total\n");
+}