Add rustfmt test to CI

.travis.yml

@@ -29,5 +29,8 @@ branches:
   only:
     - master
 
+before-script:
+  - rustup component add rustfmt-preview
 script:
+  - cargo fmt --all -- --write-mode=check
   - cargo test --verbose --target=$target -- --nocapture

src/lib.rs

@@ -10,13 +10,14 @@ use rustc_target::spec::abi::Abi;
 use syntax::ast::{Attribute, Ident, Item, ItemKind, MetaItem, Mod, Name, Ty, VisibilityKind};
 use syntax::attr;
 use syntax::codemap::Span;
+use syntax::edition::Edition;
 use syntax::ext::base::SyntaxExtension::{MultiModifier, NormalTT};
-use syntax::ext::base::{Annotatable, ExtCtxt, MacEager, MacResult, MultiItemModifier,
-                        TTMacroExpander};
+use syntax::ext::base::{
+    Annotatable, ExtCtxt, MacEager, MacResult, MultiItemModifier, TTMacroExpander,
+};
 use syntax::feature_gate::AttributeType;
 use syntax::ptr::P;
 use syntax::tokenstream::TokenStream;
-use syntax::edition::Edition;
 
 use std::cell::RefCell;
 use std::rc::Rc;
@@ -57,7 +58,7 @@ pub fn plugin_registrar(reg: &mut Registry) {
             allow_internal_unsafe: false,
             allow_internal_unstable: false,
             unstable_feature: None,
-            edition: Edition::Edition2015
+            edition: Edition::Edition2015,
         },
     );
 

src/util.rs

@@ -1,8 +1,10 @@
-use syntax::{ast::{Item, ItemKind, Mod, VisibilityKind},
-             ptr::P};
+use syntax::{
+    ast::{Item, ItemKind, Mod, VisibilityKind}, ptr::P,
+};
 
 pub fn mod_walk(mut m: Mod, item_map: &mut FnMut(Item) -> Item) -> Mod {
-    m.items = m.items
+    m.items = m
+        .items
         .into_iter()
         .map(|item| {
             let mut item = item.into_inner();

tests/test_manager.rs

@@ -1,5 +1,5 @@
+use std::io::{BufRead, BufReader, Write};
 use std::process::{Command, Stdio};
-use std::io::{Write, BufReader, BufRead};
 use std::thread::sleep;
 use std::time::Duration;