Run cargo xtest on CI

.appveyor.yml

@@ -75,3 +75,4 @@ before_test:
 test_script:
   - cargo xbuild
   - cargo bootimage
+  - cargo xtest

.travis.yml

@@ -35,4 +35,5 @@ before_script:
 script:
   - cargo xbuild
   - cargo bootimage
+  - cargo xtest
   - cargo cache --autoclean

azure-pipelines.yml

@@ -61,6 +61,9 @@ steps:
 - script: cargo bootimage
   displayName: 'Create Bootimage'
 
+- script: cargo xtest
+  displayName: 'Test'
+
 - script: rustup component add rustfmt
   displayName: 'Install Rustfmt'