diff --git a/Cargo.lock b/Cargo.lock
index 369e0e02b6f..6991e6e7b8f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -14,19 +14,6 @@ dependencies = [
  "nodrop 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "assert_cli"
-version = "0.6.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "colored 1.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "difference 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "environment 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "atty"
 version = "0.2.11"
@@ -106,14 +93,6 @@ dependencies = [
  "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "colored"
-version = "1.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "crossbeam-deque"
 version = "0.2.0"
@@ -160,11 +139,6 @@ name = "diff"
 version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "difference"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "either"
 version = "1.5.0"
@@ -190,11 +164,6 @@ dependencies = [
  "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "environment"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "error-chain"
 version = "0.12.0"
@@ -604,7 +573,6 @@ dependencies = [
 name = "rustfmt-nightly"
 version = "1.0.1"
 dependencies = [
- "assert_cli 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytecount 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "cargo_metadata 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -842,7 +810,6 @@ dependencies = [
 [metadata]
 "checksum aho-corasick 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)" = "1e9a933f4e58658d7b12defcf96dc5c720f20832deebe3e0a19efd3b6aaeeb9e"
 "checksum arrayvec 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "f405cc4c21cd8b784f6c8fc2adf9bc00f59558f0049b5ec21517f875963040cc"
-"checksum assert_cli 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)" = "a29ab7c0ed62970beb0534d637a8688842506d0ff9157de83286dacd065c8149"
 "checksum atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)" = "9a7d5b8723950951411ee34d271d99dddcc2035a16ab25310ea2c8cfd4369652"
 "checksum backtrace 0.3.9 (registry+https://github.com/rust-lang/crates.io-index)" = "89a47830402e9981c5c41223151efcced65a0510c13097c769cede7efb34782a"
 "checksum backtrace-sys 0.1.24 (registry+https://github.com/rust-lang/crates.io-index)" = "c66d56ac8dabd07f6aacdaf633f4b8262f5b3601a810a0dcddffd5c22c69daa0"
@@ -853,17 +820,14 @@ dependencies = [
 "checksum cc 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)" = "f159dfd43363c4d08055a07703eb7a3406b0dac4d0584d96965a3262db3c9d16"
 "checksum cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "082bb9b28e00d3c9d39cc03e64ce4cea0f1bb9b3fde493f0cbc008472d22bdf4"
 "checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
-"checksum colored 1.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dc0a60679001b62fb628c4da80e574b9645ab4646056d7c9018885efffe45533"
 "checksum crossbeam-deque 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f739f8c5363aca78cfb059edf753d8f0d36908c348f3d8d1503f03d8b75d9cf3"
 "checksum crossbeam-epoch 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "927121f5407de9956180ff5e936fe3cf4324279280001cd56b669d28ee7e9150"
 "checksum crossbeam-utils 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "2760899e32a1d58d5abb31129f8fae5de75220bc2176e77ff7c627ae45c918d9"
 "checksum derive-new 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)" = "6ca414e896ae072546f4d789f452daaecf60ddee4c9df5dc6d5936d769e3d87c"
 "checksum diff 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)" = "3c2b69f912779fbb121ceb775d74d51e915af17aaebc38d28a592843a2dd0a3a"
-"checksum difference 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "524cbf6897b527295dff137cec09ecf3a05f4fddffd7dfcd1585403449e74198"
 "checksum either 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "3be565ca5c557d7f59e7cfcf1844f9e3033650c929c6566f511e8005f205c1d0"
 "checksum ena 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f56c93cc076508c549d9bb747f79aa9b4eb098be7b8cad8830c3137ef52d1e00"
 "checksum env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)" = "15b0a4d2e39f8420210be8b27eeda28029729e2fd4291019455016c348240c38"
-"checksum environment 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1f4b14e20978669064c33b4c1e0fb4083412e40fe56cbea2eae80fd7591503ee"
 "checksum error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "07e791d3be96241c77c43846b665ef1384606da2cd2a48730abe606a12906e02"
 "checksum failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "6dd377bcc1b1b7ce911967e3ec24fa19c3224394ec05b54aa7b083d498341ac7"
 "checksum failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "64c2d913fe8ed3b6c6518eedf4538255b989945c14c2a7d5cbff62a5e2120596"
diff --git a/Cargo.toml b/Cargo.toml
index c598a417a72..7281ce5efdc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -60,5 +60,4 @@ bytecount = "0.4"
 rustc-workspace-hack = "1.0.0"
 
 [dev-dependencies]
-assert_cli = "0.6"
 lazy_static = "1.0.0"
diff --git a/src/test/mod.rs b/src/test/mod.rs
index 599f83cd49c..e2c2380bc2a 100644
--- a/src/test/mod.rs
+++ b/src/test/mod.rs
@@ -8,8 +8,6 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-extern crate assert_cli;
-
 use std::collections::{HashMap, HashSet};
 use std::env;
 use std::fs;
@@ -973,11 +971,10 @@ fn rustfmt() -> PathBuf {
 #[test]
 fn verify_check_works() {
     let temp_file = make_temp_file("temp_check.rs");
-    assert_cli::Assert::command(&[
-        rustfmt().to_str().unwrap(),
-        "--check",
-        temp_file.path.to_str().unwrap(),
-    ])
-    .succeeds()
-    .unwrap();
+
+    Command::new(rustfmt().to_str().unwrap())
+        .arg("--check")
+        .arg(temp_file.path.to_str().unwrap())
+        .status()
+        .expect("run with check option failed");
 }