Run rustfmt in CI (#36)

Author: GabrielMajeri

.travis.yml

@@ -16,20 +16,26 @@ install:
   - rustup component add rust-src
   # Required by cargo-xclippy
   - rustup component add clippy-preview
+  # For checking the code's formatting
+  - rustup component add rustfmt-preview
   # Try installing cargo-xbuild if it's not already installed
   - hash cargo-xbuild || cargo install cargo-xbuild
   # Download OVMF
   - bash -e "uefi-test-runner/ci/ovmf.sh"
 
 before_script:
+  # Try using cached QEMU install
   - export PATH="$PATH:$HOME/qemu/bin"
+  # Build QEMU from source if not installed
   - hash qemu-system-x86_64 || bash -e "uefi-test-runner/ci/travis-qemu.sh"
   - qemu-system-x86_64 --version
 
 script:
   - cd uefi-test-runner
-  - ./build.py run --headless
+  # Check that formatting is OK
+  - cargo fmt --all -- --check
   - ./build.py clippy
+  - ./build.py run --headless
 
 cache:
   directories: