--- a/accessible/tests/mochitest/.eslintrc.js
+++ b/accessible/tests/mochitest/.eslintrc.js
@@ -10,11 +10,10 @@ module.exports = {
 
     // XXX These are rules that are enabled in the recommended configuration, but
     // disabled here due to failures when initially implemented. They should be
     // removed (and hence enabled) at some stage.
     "no-nested-ternary": "off",
     "no-redeclare": "off",
     "no-shadow": "off",
     "no-undef": "off",
-    "space-unary-ops": "off",
   }
 };

--- a/accessible/tests/mochitest/common.js
+++ b/accessible/tests/mochitest/common.js
@@ -452,17 +452,17 @@ function testAccessibleTree(aAccOrElmOrI
 
     case "tagName":
       is(accTree[prop], acc.DOMNode.tagName, msg);
       break;
 
     case "textAttrs": {
       var prevOffset = -1;
       for (var offset in accTree[prop]) {
-        if (prevOffset != - 1) {
+        if (prevOffset != -1) {
           var attrs = accTree[prop][prevOffset];
           testTextAttrs(acc, prevOffset, attrs, { }, prevOffset, +offset, true);
         }
         prevOffset = +offset;
       }
 
       if (prevOffset != -1) {
         var charCount = getAccessible(acc, [nsIAccessibleText]).characterCount;

--- a/accessible/tests/mochitest/events.js
+++ b/accessible/tests/mochitest/events.js
@@ -2114,17 +2114,17 @@ var gLogger =
       Services.console.logStringMessage("events: " + aMsg);
   },
 
   /**
    * Return true if logging feature is enabled.
    */
   hasFeature: function logger_hasFeature(aFeature) {
     var startIdx = gA11yEventDumpFeature.indexOf(aFeature);
-    if (startIdx == - 1)
+    if (startIdx == -1)
       return false;
 
     var endIdx = startIdx + aFeature.length;
     return endIdx == gA11yEventDumpFeature.length ||
       gA11yEventDumpFeature[endIdx] == ";";
   }
 };
 

--- a/accessible/tests/mochitest/role.js
+++ b/accessible/tests/mochitest/role.js
@@ -162,17 +162,17 @@ function getRole(aAccOrElmOrID) {
   return role;
 }
 
 /**
  * Analogy of SimpleTest.is function used to check the role.
  */
 function isRole(aIdentifier, aRole, aMsg) {
   var role = getRole(aIdentifier);
-  if (role == - 1)
+  if (role == -1)
     return;
 
   if (role == aRole) {
     ok(true, aMsg);
     return;
   }
 
   var got = roleToString(role);

--- a/accessible/tests/mochitest/table.js
+++ b/accessible/tests/mochitest/table.js
@@ -232,17 +232,17 @@ function testTableIndexes(aIdentifier, a
       try {
         cellAcc = null;
         cellAcc = tableAcc.getCellAt(rowIdx, colIdx);
       } catch (e) { }
 
       ok(idx != -1 && cellAcc || idx == -1 && !cellAcc,
          id + ": Can't get cell accessible at row = " + rowIdx + ", column = " + colIdx);
 
-      if (idx != - 1) {
+      if (idx != -1) {
 
         // getRowIndexAt
         var origRowIdx = rowIdx;
         while (origRowIdx > 0 &&
                aIdxes[rowIdx][colIdx] == aIdxes[origRowIdx - 1][colIdx])
           origRowIdx--;
 
         try {