diff --git a/Makefile b/Makefile
index 8f8e68a9b..e382b534a 100644
--- a/Makefile
+++ b/Makefile
@@ -161,16 +161,21 @@ TEST_PROGS  := \
   cat \
   cp \
   env \
+  dirname \
+  echo \
   factor \
+  false \
   fold \
   mkdir \
   mv \
   nl \
   paste \
+  pwd \
   seq \
   sort \
   test \
   tr \
+  true \
   truncate \
   unexpand
 
diff --git a/test/dirname.rs b/test/dirname.rs
new file mode 100644
index 000000000..f0309ce9e
--- /dev/null
+++ b/test/dirname.rs
@@ -0,0 +1,28 @@
+use std::process::Command;
+use std::str;
+
+static PROGNAME: &'static str = "./dirname";
+
+#[test]
+fn test_path_with_trailing_slashes() {
+    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, "/root/alpha/beta/gamma/delta/epsilon");
+}
+
+#[test]
+fn test_path_without_trailing_slashes() {
+    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, "/root/alpha/beta/gamma/delta/epsilon");
+}
diff --git a/test/echo.rs b/test/echo.rs
new file mode 100644
index 000000000..b107fd4c4
--- /dev/null
+++ b/test/echo.rs
@@ -0,0 +1,50 @@
+use std::process::Command;
+use std::str;
+
+static PROGNAME: &'static str = "./echo";
+
+#[test]
+fn test_default() {
+    let po = Command::new(PROGNAME)
+        .output()
+        .unwrap_or_else(|err| panic!("{}", err));
+
+    let out = str::from_utf8(&po.stdout[..]).unwrap();
+    assert_eq!(out, "\n");
+}
+
+#[test]
+fn test_no_trailing_newline() {
+    let po = Command::new(PROGNAME)
+        .arg("-n")
+        .arg("hello_world")
+        .output()
+        .unwrap_or_else(|err| panic!("{}", err));
+
+    let out = str::from_utf8(&po.stdout[..]).unwrap();
+    assert_eq!(out, "hello_world");
+}
+
+#[test]
+fn test_enable_escapes() {
+    let po = Command::new(PROGNAME)
+        .arg("-e")
+        .arg("\\\\\\t\\r")
+        .output()
+        .unwrap_or_else(|err| panic!("{}", err));
+
+    let out = str::from_utf8(&po.stdout[..]).unwrap();
+    assert_eq!(out, "\\\t\r\n");
+}
+
+#[test]
+fn test_disable_escapes() {
+    let po = Command::new(PROGNAME)
+        .arg("-E")
+        .arg("\\b\\c\\e")
+        .output()
+        .unwrap_or_else(|err| panic!("{}", err));
+
+    let out = str::from_utf8(&po.stdout[..]).unwrap();
+    assert_eq!(out, "\\b\\c\\e\n");
+}
diff --git a/test/false.rs b/test/false.rs
new file mode 100644
index 000000000..2cd6a327d
--- /dev/null
+++ b/test/false.rs
@@ -0,0 +1,9 @@
+use std::process::Command;
+
+static PROGNAME: &'static str = "./false";
+
+#[test]
+fn test_exit_code() {
+    let exit_status = Command::new(PROGNAME).status().unwrap().success();
+    assert_eq!(exit_status, false);
+}
diff --git a/test/pwd.rs b/test/pwd.rs
new file mode 100644
index 000000000..0800b3ae4
--- /dev/null
+++ b/test/pwd.rs
@@ -0,0 +1,16 @@
+use std::env;
+use std::process::Command;
+use std::str;
+
+static PROGNAME: &'static str = "./pwd";
+
+#[test]
+fn test_default() {
+    let po = Command::new(PROGNAME)
+        .output()
+        .unwrap_or_else(|err| panic!("{}", err));
+
+    let out = str::from_utf8(&po.stdout[..]).unwrap().trim_right();
+    let expected = env::current_dir().unwrap().into_os_string().into_string().unwrap();
+    assert_eq!(out, expected);
+}
diff --git a/test/true.rs b/test/true.rs
new file mode 100644
index 000000000..fba9fff36
--- /dev/null
+++ b/test/true.rs
@@ -0,0 +1,9 @@
+use std::process::Command;
+
+static PROGNAME: &'static str = "./true";
+
+#[test]
+fn test_exit_code() {
+    let exit_status = Command::new(PROGNAME).status().unwrap().success();
+    assert_eq!(exit_status, true);
+}