diff --git a/tests/coreutils.rs b/tests/coreutils.rs
index eca5376..94ac4fc 100644
--- a/tests/coreutils.rs
+++ b/tests/coreutils.rs
@@ -22,6 +22,9 @@ mod date;
 #[path = "coreutils/dd.rs"]
 mod dd;
 
+#[path = "coreutils/du.rs"]
+mod du;
+
 #[path = "coreutils/echo.rs"]
 mod echo;
 
diff --git a/tests/coreutils/du.rs b/tests/coreutils/du.rs
new file mode 100644
index 0000000..d076a82
--- /dev/null
+++ b/tests/coreutils/du.rs
@@ -0,0 +1,152 @@
+use std::ffi::OsString;
+use uutils_args::{Arguments, Options};
+
+#[derive(Arguments)]
+enum Arg {
+    #[arg("--apparent-size")]
+    ApparentSize,
+
+    #[arg("-B[SIZE]", "--block-size[=SIZE]")]
+    BlockSize(OsString),
+
+    #[arg("-b", "--bytes")]
+    Bytes,
+
+    #[arg("-k")]
+    KibiBytes,
+
+    #[arg("-m")]
+    MibiBytes,
+    // Note that --si and -h only affect the *output formatting*,
+    // and not the size determination itself.
+}
+
+#[derive(Debug, Default, PartialEq, Eq)]
+struct Settings {
+    apparent_size: bool,
+    block_size_str: Option<OsString>,
+}
+
+impl Options<Arg> for Settings {
+    fn apply(&mut self, arg: Arg) -> Result<(), uutils_args::Error> {
+        match arg {
+            Arg::ApparentSize => self.apparent_size = true,
+            Arg::BlockSize(os_str) => self.block_size_str = Some(os_str),
+            Arg::Bytes => {
+                self.apparent_size = true;
+                self.block_size_str = Some("1".into());
+            }
+            Arg::KibiBytes => self.block_size_str = Some("K".into()),
+            Arg::MibiBytes => self.block_size_str = Some("M".into()),
+        }
+        Ok(())
+    }
+}
+
+#[test]
+fn noarg() {
+    let (settings, operands) = Settings::default().parse(["du"]).unwrap();
+    assert_eq!(operands, Vec::<OsString>::new());
+    assert_eq!(
+        settings,
+        Settings {
+            apparent_size: false,
+            block_size_str: None,
+        }
+    );
+}
+
+#[test]
+fn bytes() {
+    let (settings, operands) = Settings::default().parse(["du", "-b"]).unwrap();
+    assert_eq!(operands, Vec::<OsString>::new());
+    assert_eq!(
+        settings,
+        Settings {
+            apparent_size: true,
+            block_size_str: Some("1".into()),
+        }
+    );
+}
+
+#[test]
+fn kibibytes() {
+    let (settings, operands) = Settings::default().parse(["du", "-k"]).unwrap();
+    assert_eq!(operands, Vec::<OsString>::new());
+    assert_eq!(
+        settings,
+        Settings {
+            apparent_size: false,
+            block_size_str: Some("K".into()),
+        }
+    );
+}
+
+#[test]
+fn bytes_kibibytes() {
+    let (settings, operands) = Settings::default().parse(["du", "-bk"]).unwrap();
+    assert_eq!(operands, Vec::<OsString>::new());
+    assert_eq!(
+        settings,
+        Settings {
+            apparent_size: true,
+            block_size_str: Some("K".into()),
+        }
+    );
+}
+
+#[test]
+fn kibibytes_bytes() {
+    let (settings, operands) = Settings::default().parse(["du", "-kb"]).unwrap();
+    assert_eq!(operands, Vec::<OsString>::new());
+    assert_eq!(
+        settings,
+        Settings {
+            apparent_size: true,
+            block_size_str: Some("1".into()),
+        }
+    );
+}
+
+#[test]
+fn apparent_size() {
+    let (settings, operands) = Settings::default()
+        .parse(["du", "--apparent-size"])
+        .unwrap();
+    assert_eq!(operands, Vec::<OsString>::new());
+    assert_eq!(
+        settings,
+        Settings {
+            apparent_size: true,
+            block_size_str: None,
+        }
+    );
+}
+
+#[test]
+fn mibibytes() {
+    let (settings, operands) = Settings::default().parse(["du", "-m"]).unwrap();
+    assert_eq!(operands, Vec::<OsString>::new());
+    assert_eq!(
+        settings,
+        Settings {
+            apparent_size: false,
+            block_size_str: Some("M".into()),
+        }
+    );
+}
+
+#[test]
+fn all() {
+    let (settings, operands) = Settings::default()
+        .parse(["du", "--apparent-size", "-bkm", "-B123"])
+        .unwrap();
+    assert_eq!(operands, Vec::<OsString>::new());
+    assert_eq!(
+        settings,
+        Settings {
+            apparent_size: true,
+            block_size_str: Some("123".into()),
+        }
+    );
+}