diff --git a/Makefile b/Makefile
index 08f722cd5..798d3e998 100644
--- a/Makefile
+++ b/Makefile
@@ -165,6 +165,7 @@ TEST_PROGS  := \
   base64 \
   basename \
   cat \
+  cksum \
   cp \
   cut \
   env \
@@ -189,6 +190,7 @@ TEST_PROGS  := \
   sort \
   split \
   stdbuf \
+  sum \
   tac \
   test \
   touch \
diff --git a/test/cksum.rs b/test/cksum.rs
new file mode 100644
index 000000000..c5ecdf3be
--- /dev/null
+++ b/test/cksum.rs
@@ -0,0 +1,39 @@
+use std::process::Command;
+use util::*;
+
+static PROGNAME: &'static str = "./cksum";
+
+#[path = "common/util.rs"]
+#[macro_use]
+mod util;
+
+#[test]
+fn test_single_file() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.arg("lorem_ipsum.txt"));
+
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, get_file_contents("single_file.expected"));
+}
+
+#[test]
+fn test_multiple_files() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.arg("lorem_ipsum.txt").arg("alice_in_wonderland.txt"));
+
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, get_file_contents("multiple_files.expected"));
+}
+
+#[test]
+fn test_stdin() {
+    let input = get_file_contents("lorem_ipsum.txt");
+    let mut cmd = Command::new(PROGNAME);
+    let result = run_piped_stdin(&mut cmd, input);
+
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, get_file_contents("stdin.expected"));
+}
diff --git a/test/fixtures/cksum/alice_in_wonderland.txt b/test/fixtures/cksum/alice_in_wonderland.txt
new file mode 100644
index 000000000..a95562a1c
--- /dev/null
+++ b/test/fixtures/cksum/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?"
diff --git a/test/fixtures/cksum/lorem_ipsum.txt b/test/fixtures/cksum/lorem_ipsum.txt
new file mode 100644
index 000000000..16752446c
--- /dev/null
+++ b/test/fixtures/cksum/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.
diff --git a/test/fixtures/cksum/multiple_files.expected b/test/fixtures/cksum/multiple_files.expected
new file mode 100644
index 000000000..d7a4f5b4f
--- /dev/null
+++ b/test/fixtures/cksum/multiple_files.expected
@@ -0,0 +1,2 @@
+378294376 772 lorem_ipsum.txt
+3805907707 302 alice_in_wonderland.txt
diff --git a/test/fixtures/cksum/single_file.expected b/test/fixtures/cksum/single_file.expected
new file mode 100644
index 000000000..e9fc1ca7c
--- /dev/null
+++ b/test/fixtures/cksum/single_file.expected
@@ -0,0 +1 @@
+378294376 772 lorem_ipsum.txt
diff --git a/test/fixtures/cksum/stdin.expected b/test/fixtures/cksum/stdin.expected
new file mode 100644
index 000000000..28b37d0be
--- /dev/null
+++ b/test/fixtures/cksum/stdin.expected
@@ -0,0 +1 @@
+378294376 772
diff --git a/test/fixtures/sum/alice_in_wonderland.txt b/test/fixtures/sum/alice_in_wonderland.txt
new file mode 100644
index 000000000..a95562a1c
--- /dev/null
+++ b/test/fixtures/sum/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?"
diff --git a/test/fixtures/sum/bsd_multiple_files.expected b/test/fixtures/sum/bsd_multiple_files.expected
new file mode 100644
index 000000000..1b05ee27f
--- /dev/null
+++ b/test/fixtures/sum/bsd_multiple_files.expected
@@ -0,0 +1,2 @@
+8109 1 lorem_ipsum.txt
+1814 1 alice_in_wonderland.txt
diff --git a/test/fixtures/sum/bsd_single_file.expected b/test/fixtures/sum/bsd_single_file.expected
new file mode 100644
index 000000000..3cffc4337
--- /dev/null
+++ b/test/fixtures/sum/bsd_single_file.expected
@@ -0,0 +1 @@
+8109 1
diff --git a/test/fixtures/sum/bsd_stdin.expected b/test/fixtures/sum/bsd_stdin.expected
new file mode 100644
index 000000000..3cffc4337
--- /dev/null
+++ b/test/fixtures/sum/bsd_stdin.expected
@@ -0,0 +1 @@
+8109 1
diff --git a/test/fixtures/sum/lorem_ipsum.txt b/test/fixtures/sum/lorem_ipsum.txt
new file mode 100644
index 000000000..16752446c
--- /dev/null
+++ b/test/fixtures/sum/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.
diff --git a/test/fixtures/sum/sysv_multiple_files.expected b/test/fixtures/sum/sysv_multiple_files.expected
new file mode 100644
index 000000000..83a6d6d83
--- /dev/null
+++ b/test/fixtures/sum/sysv_multiple_files.expected
@@ -0,0 +1,2 @@
+6985 2 lorem_ipsum.txt
+27441 1 alice_in_wonderland.txt
diff --git a/test/fixtures/sum/sysv_single_file.expected b/test/fixtures/sum/sysv_single_file.expected
new file mode 100644
index 000000000..e0f7252cb
--- /dev/null
+++ b/test/fixtures/sum/sysv_single_file.expected
@@ -0,0 +1 @@
+6985 2 lorem_ipsum.txt
diff --git a/test/fixtures/sum/sysv_stdin.expected b/test/fixtures/sum/sysv_stdin.expected
new file mode 100644
index 000000000..f0fba8c81
--- /dev/null
+++ b/test/fixtures/sum/sysv_stdin.expected
@@ -0,0 +1 @@
+6985 2
diff --git a/test/sum.rs b/test/sum.rs
new file mode 100644
index 000000000..fb4abbf2d
--- /dev/null
+++ b/test/sum.rs
@@ -0,0 +1,70 @@
+use std::process::Command;
+use util::*;
+
+static PROGNAME: &'static str = "./sum";
+
+#[path = "common/util.rs"]
+#[macro_use]
+mod util;
+
+#[test]
+fn test_bsd_single_file() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.arg("lorem_ipsum.txt"));
+
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, get_file_contents("bsd_single_file.expected"));
+}
+
+#[test]
+fn test_bsd_multiple_files() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.arg("lorem_ipsum.txt").arg("alice_in_wonderland.txt"));
+
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, get_file_contents("bsd_multiple_files.expected"));
+}
+
+#[test]
+fn test_bsd_stdin() {
+    let input = get_file_contents("lorem_ipsum.txt");
+    let mut cmd = Command::new(PROGNAME);
+    let result = run_piped_stdin(&mut cmd, input);
+
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, get_file_contents("bsd_stdin.expected"));
+}
+
+#[test]
+fn test_sysv_single_file() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.arg("-s").arg("lorem_ipsum.txt"));
+
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, get_file_contents("sysv_single_file.expected"));
+}
+
+#[test]
+fn test_sysv_multiple_files() {
+    let mut cmd = Command::new(PROGNAME);
+    let result = run(&mut cmd.arg("-s").arg("lorem_ipsum.txt").arg("alice_in_wonderland.txt"));
+
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, get_file_contents("sysv_multiple_files.expected"));
+}
+
+#[test]
+fn test_sysv_stdin() {
+    let input = get_file_contents("lorem_ipsum.txt");
+    let mut cmd = Command::new(PROGNAME);
+    let result = run_piped_stdin(&mut cmd.arg("-s"), input);
+
+    assert_empty_stderr!(result);
+    assert!(result.success);
+    assert_eq!(result.stdout, get_file_contents("sysv_stdin.expected"));
+}