Add initial tests for basename.

Makefile

@@ -158,6 +158,7 @@ endif
 
 # Programs with usable tests
 TEST_PROGS  := \
+  basename \
   cat \
   cp \
   env \

test/basename.rs

@@ -0,0 +1,54 @@
+use std::process::Command;
+use std::str;
+
+static PROGNAME: &'static str = "./basename";
+
+#[test]
+fn test_directory() {
+    let dir = "/root/alpha/beta/gamma/delta/epsilon/omega/";
+    let po = Command::new(PROGNAME)
+        .arg(dir)
+        .output()
+        .unwrap_or_else(|err| panic!("{}", err));
+
+    let out = str::from_utf8(&po.stdout[..]).unwrap().trim_right();
+    assert_eq!(out, "omega");
+}
+
+#[test]
+fn test_file() {
+    let file = "/etc/passwd";
+    let po = Command::new(PROGNAME)
+        .arg(file)
+        .output()
+        .unwrap_or_else(|err| panic!("{}", err));
+
+    let out = str::from_utf8(&po.stdout[..]).unwrap().trim_right();
+    assert_eq!(out, "passwd");
+}
+
+#[test]
+fn test_remove_suffix() {
+    let path = "/usr/local/bin/reallylongexecutable.exe";
+    let po = Command::new(PROGNAME)
+        .arg(path)
+        .arg(".exe")
+        .output()
+        .unwrap_or_else(|err| panic!("{}", err));
+
+    let out = str::from_utf8(&po.stdout[..]).unwrap().trim_right();
+    assert_eq!(out, "reallylongexecutable");
+}
+
+#[test]
+fn test_dont_remove_suffix() {
+    let path = "/foo/bar/baz";
+    let po = Command::new(PROGNAME)
+        .arg(path)
+        .arg("baz")
+        .output()
+        .unwrap_or_else(|err| panic!("{}", err));
+
+    let out = str::from_utf8(&po.stdout[..]).unwrap().trim_right();
+    assert_eq!(out, "baz");
+}