diff --git a/servo/components/servo/Cargo.lock b/servo/components/servo/Cargo.lock
index 8c1955227eb1..f7d8bf440370 100644
--- a/servo/components/servo/Cargo.lock
+++ b/servo/components/servo/Cargo.lock
@@ -2146,8 +2146,6 @@ dependencies = [
  "app_units 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "cssparser 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "msg 0.0.1",
- "plugins 0.0.1",
  "rustc-serialize 0.3.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "selectors 0.5.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "string_cache 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -2373,10 +2371,6 @@ dependencies = [
 name = "util_tests"
 version = "0.0.1"
 dependencies = [
- "app_units 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "euclid 0.6.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "plugins 0.0.1",
  "util 0.0.1",
 ]
 
diff --git a/servo/tests/unit/profile/time.rs b/servo/tests/unit/profile/time.rs
index 6ee24ed3416a..70daaf2cb73c 100644
--- a/servo/tests/unit/profile/time.rs
+++ b/servo/tests/unit/profile/time.rs
@@ -11,7 +11,7 @@ fn time_profiler_smoke_test() {
     let chan = time::Profiler::create(&None, None);
     assert!(true, "Can create the profiler thread");
 
-    let (ipcchan, ipcport) = ipc::channel().unwrap();
+    let (ipcchan, _ipcport) = ipc::channel().unwrap();
     chan.send(ProfilerMsg::Exit(ipcchan));
     assert!(true, "Can tell the profiler thread to exit");
 }
diff --git a/servo/tests/unit/style/Cargo.toml b/servo/tests/unit/style/Cargo.toml
index 91c3d5d4f64f..795bb9284baa 100644
--- a/servo/tests/unit/style/Cargo.toml
+++ b/servo/tests/unit/style/Cargo.toml
@@ -9,8 +9,6 @@ path = "lib.rs"
 doctest = false
 
 [dependencies]
-msg = {path = "../../../components/msg"}
-plugins = {path = "../../../components/plugins"}
 style = {path = "../../../components/style"}
 style_traits = {path = "../../../components/style_traits"}
 util = {path = "../../../components/util"}
diff --git a/servo/tests/unit/style/lib.rs b/servo/tests/unit/style/lib.rs
index 7f6a1c11b7ff..6f117388acb6 100644
--- a/servo/tests/unit/style/lib.rs
+++ b/servo/tests/unit/style/lib.rs
@@ -2,14 +2,13 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#![cfg(test)]
 #![feature(plugin)]
-#![cfg_attr(test, feature(core_intrinsics))]
-#![plugin(plugins)]
+#![feature(core_intrinsics)]
 
 extern crate app_units;
 extern crate cssparser;
 extern crate euclid;
-extern crate msg;
 extern crate rustc_serialize;
 extern crate selectors;
 #[macro_use(atom, ns)] extern crate string_cache;
@@ -18,14 +17,14 @@ extern crate style_traits;
 extern crate url;
 extern crate util;
 
-#[cfg(test)] mod attr;
-#[cfg(test)] mod logical_geometry;
-#[cfg(test)] mod media_queries;
-#[cfg(test)] mod properties;
-#[cfg(test)] mod stylesheets;
-#[cfg(test)] mod viewport;
+mod attr;
+mod logical_geometry;
+mod media_queries;
+mod properties;
+mod stylesheets;
+mod viewport;
 
-#[cfg(test)] mod writing_modes {
+mod writing_modes {
     use style::logical_geometry::WritingMode;
     use style::properties::{INITIAL_SERVO_VALUES, ComputedValues, get_writing_mode};
 
diff --git a/servo/tests/unit/util/Cargo.toml b/servo/tests/unit/util/Cargo.toml
index 0ef11c4dc599..c61afbb1ea06 100644
--- a/servo/tests/unit/util/Cargo.toml
+++ b/servo/tests/unit/util/Cargo.toml
@@ -10,7 +10,3 @@ doctest = false
 
 [dependencies]
 util = {path = "../../../components/util"}
-plugins = {path = "../../../components/plugins"}
-app_units = {version = "0.2.3", features = ["plugins"]}
-euclid = {version = "0.6.4", features = ["plugins"]}
-libc = "0.2"
diff --git a/servo/tests/unit/util/lib.rs b/servo/tests/unit/util/lib.rs
index d124036bef2d..c79c763eb13c 100644
--- a/servo/tests/unit/util/lib.rs
+++ b/servo/tests/unit/util/lib.rs
@@ -2,18 +2,12 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
-#![cfg_attr(test, feature(plugin, custom_derive))]
-#![cfg_attr(test, plugin(plugins))]
-#![feature(alloc)]
+#![cfg(test)]
 
-extern crate alloc;
-extern crate app_units;
-extern crate euclid;
-extern crate libc;
 extern crate util;
 
-#[cfg(test)] mod cache;
-#[cfg(test)] mod opts;
-#[cfg(test)] mod str;
-#[cfg(test)] mod thread;
-#[cfg(test)] mod prefs;
+mod cache;
+mod opts;
+mod prefs;
+mod str;
+mod thread;
diff --git a/servo/tests/unit/util/str.rs b/servo/tests/unit/util/str.rs
index 9afbc77e8237..a0eb750934cd 100644
--- a/servo/tests/unit/util/str.rs
+++ b/servo/tests/unit/util/str.rs
@@ -12,7 +12,7 @@ pub fn split_html_space_chars_whitespace() {
 
 #[test]
 pub fn test_str_join_empty() {
-    let slice = [] as [&str; 0];
+    let slice: [&str; 0] = [];
     let actual = str_join(&slice, "-");
     let expected = "";
     assert_eq!(actual, expected);