Move test specific eslint rules to eslint task

.eslintrc

@@ -81,9 +81,6 @@
         "block-spacing": [2, "always"],
         "key-spacing": [2, {"beforeColon": false, "afterColon": true}],
         "max-nested-callbacks": [2, 3],
-        "mocha/no-exclusive-tests": 2,
-        "mocha/no-global-tests": 2,
-        "mocha/handle-done-callback": 2,
         "new-cap": 2,
         "new-parens": 2,
         "newline-after-var": 2,
@@ -119,11 +116,5 @@
     ecmaFeatures : {
         modules: true
     },
-    "extends": "eslint:recommended",
-    "globals": {
-        "expect": true
-    },
-    "plugins": [
-        "mocha"
-    ]
+    "extends": "eslint:recommended"
 }

tasks/gulp-eslint.js

@@ -46,7 +46,18 @@ gulp.task('lint:tests', () => {
       '!./test/server_side/**/*',
       '!./test/spec/**/*',
     ])
-    .pipe(eslint())
+    .pipe(eslint({
+      rules: {
+        'no-unused-expressions': 0,
+        'mocha/no-exclusive-tests': 2,
+        'mocha/no-global-tests': 2,
+        'mocha/handle-done-callback': 2,
+      },
+      globals: {
+        'expect': true,
+      },
+      plugins: [ 'mocha' ],
+    }))
     .pipe(eslint.format())
     .pipe(eslint.failAfterError());
 });