Issue 6862 - Add tests for Snippets module events

test/snippets.js

Index: test/snippets.js
===================================================================
--- a/test/snippets.js
+++ b/test/snippets.js
@@ -83,22 +83,36 @@
     ["foo-2"]
   );
 
   test.done();
 };
 
 exports.testSnippetFiltersContainer = function(test)
 {
+  let events = [];
+
+  function eventHandler(...args)
+  {
+    events.push([...args]);
+  }
+
   function compareRules(description, domain, expectedMatches)
   {
     let result = Snippets.getFiltersForDomain(domain);
     test.deepEqual(result.sort(), expectedMatches.sort(), description);
   }
 
+  Snippets.on("snippets.filterAdded",
+              eventHandler.bind(null, "snippets.filterAdded"));
+  Snippets.on("snippets.filterRemoved",
+              eventHandler.bind(null, "snippets.filterRemoved"));
+  Snippets.on("snippets.filtersCleared",
+              eventHandler.bind(null, "snippets.filtersCleared"));
+
   let domainFilter = Filter.fromText("example.com#$#filter1");
   let subdomainFilter = Filter.fromText("www.example.com#$#filter2");
   let otherDomainFilter = Filter.fromText("other.example.com#$#filter3");
 
   Snippets.add(domainFilter);
   Snippets.add(subdomainFilter);
   Snippets.add(otherDomainFilter);
   compareRules(
@@ -116,16 +130,25 @@
 
   Snippets.clear();
   compareRules(
     "Return no filters after clearing",
     "www.example.com",
     []
   );
 
+  test.deepEqual(events, [
+    ["snippets.filterAdded", domainFilter],
+    ["snippets.filterAdded", subdomainFilter],
+    ["snippets.filterAdded", otherDomainFilter],
+    ["snippets.filterRemoved", domainFilter],
+    ["snippets.filtersCleared"]
+  ],
+  "Event log");
+
   test.done();
 };
 
 exports.testScriptParsing = function(test)
 {
   function checkParsedScript(description, script, expectedTree)
   {
     let tree = parseScript(script);