od: create first tests for od

Makefile

@@ -149,6 +149,7 @@ TEST_PROGS  := \
 	mktemp \
 	mv \
 	nl \
+	od \
 	paste \
 	printf \
 	ptx \

tests/od.rs

@@ -0,0 +1,87 @@
+#[macro_use]
+mod common;
+ 
+use common::util::*;
+use std::path::Path;
+use std::env;
+use std::io::Write;
+use std::fs::File;
+use std::fs::remove_file;
+ 
+static UTIL_NAME: &'static str = "od";
+ 
+// octal dump of 'abcdefghijklmnopqrstuvwxyz\n'
+static ALPHA_OUT: &'static str = "0000000    061141  062143  063145  064147  065151  066153  067155  070157\n0000020    071161  072163  073165  074167  075171  000012                \n0000033\n";
+ 
+// XXX We could do a better job of ensuring that we have a fresh temp dir to ourself,
+// not a general one ful of other proc's leftovers. 
+ 
+// Test that od can read one file and dump with default format 
+#[test]
+fn test_file() {
+    let (_, mut ucmd) = testing(UTIL_NAME);
+    let temp = env::var("TMPDIR").unwrap_or_else(|_| env::var("TEMP").unwrap());
+    let tmpdir = Path::new(&temp);
+    let file = tmpdir.join("test");
+     
+    {
+        let mut f = File::create(&file).unwrap();
+        match f.write_all(b"abcdefghijklmnopqrstuvwxyz\n") {
+            Err(_)  => panic!("Test setup failed - could not write file"),
+            _ => {}
+        }
+    }
+     
+    let result = ucmd.arg(file.as_os_str()).run();
+ 
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, ALPHA_OUT);
+     
+    let _ = remove_file(file);
+}
+ 
+// Test that od can read 2 files and concatenate the contents
+#[test]
+fn test_2files() {
+    let (_, mut ucmd) = testing(UTIL_NAME);
+    let temp = env::var("TMPDIR").unwrap_or_else(|_| env::var("TEMP").unwrap());
+    let tmpdir = Path::new(&temp);
+    let file1 = tmpdir.join("test1");
+    let file2 = tmpdir.join("test2");
+     
+    for &(n,a) in [(1,"a"), (2,"b")].iter() {
+        println!("number: {} letter:{}", n, a);
+     }
+         
+    for &(path,data)in &[(&file1, "abcdefghijklmnop"),(&file2, "qrstuvwxyz\n")] {
+        let mut f = File::create(&path).unwrap();
+        match f.write_all(data.as_bytes()) {
+            Err(_)  => panic!("Test setup failed - could not write file"),
+            _ => {}
+        }
+    }
+     
+    let result = ucmd.arg(file1.as_os_str()).arg(file2.as_os_str()).run();
+ 
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, ALPHA_OUT);
+     
+    let _ = remove_file(file1);
+    let _ = remove_file(file2);
+}
+
+// Test that od gives non-0 exit val for filename that dosen't exist.   
+#[test]
+fn test_no_file() {
+    let (_, mut ucmd) = testing(UTIL_NAME);
+    let temp = env::var("TMPDIR").unwrap_or_else(|_| env::var("TEMP").unwrap());
+    let tmpdir = Path::new(&temp);
+    let file = tmpdir.join("}surely'none'would'thus'a'file'name");
+     
+    let result = ucmd.arg(file.as_os_str()).run();
+     
+    assert!(!result.success);
+ 
+}