travis: try to fix wasmpack chrome test on macOS

.travis.yml

@@ -15,7 +15,17 @@ matrix:
     - os: linux
       rust: nightly
     - os: osx
-      osx_image: xcode11
+      osx_image: xcode11.2
+      addons:
+        chrome: stable
+        firefox: latest
+      install:
+        - curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.35.1/install.sh | sh
+        - source ~/.nvm/nvm.sh
+        - nvm install --lts
+        - npm install -g chromedriver
+        - curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+        - which chromedriver
       rust: stable
   allow_failures:
     - rust: nightly
@@ -40,6 +50,5 @@ script:
   - cd parity-util-mem/ && cargo test --no-default-features --features=dlmalloc-global && cd ..
   - cd rlp/ && cargo test --no-default-features && cargo check --benches && cd ..
   - cd triehash/ && cargo check --benches && cd ..
-  - if [ "$TRAVIS_OS_NAME" == "linux" ]; then
-    cd kvdb-web/ && wasm-pack test --headless --chrome --firefox && cd ..;
-    fi
+  - cd kvdb-web/ && wasm-pack test --headless --chrome --firefox && cd ..
+

ethbloom/src/lib.rs

@@ -93,7 +93,7 @@ impl<'a> From<Input<'a>> for Hash<'a> {
 				keccak256.update(raw);
 				keccak256.finalize(&mut out);
 				Hash::Owned(out)
-			},
+			}
 			Input::Hash(hash) => Hash::Ref(hash),
 		}
 	}

kvdb-rocksdb/src/lib.rs

@@ -112,11 +112,7 @@ impl CompactionProfile {
 		let hdd_check_file = db_path
 			.to_str()
 			.and_then(|path_str| Command::new("df").arg(path_str).output().ok())
-			.and_then(|df_res| if df_res.status.success() {
-				Some(df_res.stdout)
-			} else {
-				None
-			})
+			.and_then(|df_res| if df_res.status.success() { Some(df_res.stdout) } else { None })
 			.and_then(rotational_from_df_output);
 		// Read out the file and match compaction profile.
 		if let Some(hdd_check) = hdd_check_file {
@@ -151,10 +147,7 @@ impl CompactionProfile {
 
 	/// Slow HDD compaction profile
 	pub fn hdd() -> CompactionProfile {
-		CompactionProfile {
-			initial_file_size: 256 * MB as u64,
-			block_size: 64 * KB,
-		}
+		CompactionProfile { initial_file_size: 256 * MB as u64, block_size: 64 * KB }
 	}
 }
 

rlp/src/rlpin.rs

@@ -201,10 +201,9 @@ impl<'a> Rlp<'a> {
 	/// raw data slice.
 	///
 	/// Returns an error if this Rlp is not a list or if the index is out of range.
-	pub fn at_with_offset<'view>(&'view self, index: usize)
-		-> Result<(Rlp<'a>, usize), DecoderError>
-		where
-			'a: 'view,
+	pub fn at_with_offset<'view>(&'view self, index: usize) -> Result<(Rlp<'a>, usize), DecoderError>
+	where
+		'a: 'view,
 	{
 		if !self.is_list() {
 			return Err(DecoderError::RlpExpectedToBeList);