comm: add basic tests

Makefile

@@ -114,6 +114,7 @@ TEST_PROGS  := \
 	basename \
 	cat \
 	cksum \
+	comm \
 	cp \
 	cut \
 	dirname \

tests/comm.rs

@@ -0,0 +1,47 @@
+#[macro_use] mod common;
+
+use common::util;
+
+static UTIL_NAME: &'static str = "comm";
+
+#[test]
+fn test_comm_ab_no_args() {
+    let (at, mut ucmd) = util::testing(UTIL_NAME);
+    let result = ucmd.args(&["a", "b"]).run();
+    assert_eq!(result.stdout, at.read("ab.expected"));
+}
+
+#[test]
+fn test_comm_ab_dash_one() {
+    let (at, mut ucmd) = util::testing(UTIL_NAME);
+    let result = ucmd.args(&["a", "b", "-1"]).run();
+    assert_eq!(result.stdout, at.read("ab1.expected"));
+}
+
+#[test]
+fn test_comm_ab_dash_two() {
+    let (at, mut ucmd) = util::testing(UTIL_NAME);
+    let result = ucmd.args(&["a", "b", "-2"]).run();
+    assert_eq!(result.stdout, at.read("ab2.expected"));
+}
+
+#[test]
+fn test_comm_ab_dash_three() {
+    let (at, mut ucmd) = util::testing(UTIL_NAME);
+    let result = ucmd.args(&["a", "b", "-3"]).run();
+    assert_eq!(result.stdout, at.read("ab3.expected"));
+}
+
+#[test]
+fn test_comm_aempty() {
+    let (at, mut ucmd) = util::testing(UTIL_NAME);
+    let result = ucmd.args(&["a", "empty"]).run();
+    assert_eq!(result.stdout, at.read("aempty.expected"));
+}
+
+#[test]
+fn test_comm_emptyempty() {
+    let (at, mut ucmd) = util::testing(UTIL_NAME);
+    let result = ucmd.args(&["empty", "empty"]).run();
+    assert_eq!(result.stdout, at.read("emptyempty.expected"));
+}

tests/fixtures/comm/a

@@ -0,0 +1,2 @@
+a
+z

tests/fixtures/comm/ab.expected

@@ -0,0 +1,3 @@
+a
+	b
+		z

tests/fixtures/comm/ab1.expected

@@ -0,0 +1,2 @@
+b
+	z

tests/fixtures/comm/ab2.expected

@@ -0,0 +1,2 @@
+a
+	z

tests/fixtures/comm/ab3.expected

@@ -0,0 +1,2 @@
+a
+	b

tests/fixtures/comm/aempty.expected

@@ -0,0 +1,2 @@
+a
+z

tests/fixtures/comm/b

@@ -0,0 +1,2 @@
+b
+z