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diff --git a/spec/javascripts/filtered_search/filtered_search_tokenizer_spec.js.es6 b/spec/javascripts/filtered_search/filtered_search_tokenizer_spec.js.es6
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@@ -0,0 +1,104 @@
+//= require extensions/array
+//= require filtered_search/filtered_search_token_keys
+//= require filtered_search/filtered_search_tokenizer
+
+(() => {
+  describe('Filtered Search Tokenizer', () => {
+    describe('processTokens', () => {
+      it('returns for input containing only search value', () => {
+        const results = gl.FilteredSearchTokenizer.processTokens('searchTerm');
+        expect(results.searchToken).toBe('searchTerm');
+        expect(results.tokens.length).toBe(0);
+        expect(results.lastToken).toBe(results.searchToken);
+      });
+
+      it('returns for input containing only tokens', () => {
+        const results = gl.FilteredSearchTokenizer
+          .processTokens('author:@root label:~"Very Important" milestone:%v1.0 assignee:none');
+        expect(results.searchToken).toBe('');
+        expect(results.tokens.length).toBe(4);
+        expect(results.tokens[3]).toBe(results.lastToken);
+
+        expect(results.tokens[0].key).toBe('author');
+        expect(results.tokens[0].value).toBe('root');
+        expect(results.tokens[0].symbol).toBe('@');
+
+        expect(results.tokens[1].key).toBe('label');
+        expect(results.tokens[1].value).toBe('"Very Important"');
+        expect(results.tokens[1].symbol).toBe('~');
+
+        expect(results.tokens[2].key).toBe('milestone');
+        expect(results.tokens[2].value).toBe('v1.0');
+        expect(results.tokens[2].symbol).toBe('%');
+
+        expect(results.tokens[3].key).toBe('assignee');
+        expect(results.tokens[3].value).toBe('none');
+        expect(results.tokens[3].symbol).toBe('');
+      });
+
+      it('returns for input starting with search value and ending with tokens', () => {
+        const results = gl.FilteredSearchTokenizer
+          .processTokens('searchTerm anotherSearchTerm milestone:none');
+        expect(results.searchToken).toBe('searchTerm anotherSearchTerm');
+        expect(results.tokens.length).toBe(1);
+        expect(results.tokens[0]).toBe(results.lastToken);
+        expect(results.tokens[0].key).toBe('milestone');
+        expect(results.tokens[0].value).toBe('none');
+        expect(results.tokens[0].symbol).toBe('');
+      });
+
+      it('returns for input starting with tokens and ending with search value', () => {
+        const results = gl.FilteredSearchTokenizer
+          .processTokens('assignee:@user searchTerm');
+
+        expect(results.searchToken).toBe('searchTerm');
+        expect(results.tokens.length).toBe(1);
+        expect(results.tokens[0].key).toBe('assignee');
+        expect(results.tokens[0].value).toBe('user');
+        expect(results.tokens[0].symbol).toBe('@');
+        expect(results.lastToken).toBe(results.searchToken);
+      });
+
+      it('returns for input containing search value wrapped between tokens', () => {
+        const results = gl.FilteredSearchTokenizer
+          .processTokens('author:@root label:~"Won\'t fix" searchTerm anotherSearchTerm milestone:none');
+
+        expect(results.searchToken).toBe('searchTerm anotherSearchTerm');
+        expect(results.tokens.length).toBe(3);
+        expect(results.tokens[2]).toBe(results.lastToken);
+
+        expect(results.tokens[0].key).toBe('author');
+        expect(results.tokens[0].value).toBe('root');
+        expect(results.tokens[0].symbol).toBe('@');
+
+        expect(results.tokens[1].key).toBe('label');
+        expect(results.tokens[1].value).toBe('"Won\'t fix"');
+        expect(results.tokens[1].symbol).toBe('~');
+
+        expect(results.tokens[2].key).toBe('milestone');
+        expect(results.tokens[2].value).toBe('none');
+        expect(results.tokens[2].symbol).toBe('');
+      });
+
+      it('returns for input containing search value in between tokens', () => {
+        const results = gl.FilteredSearchTokenizer
+          .processTokens('author:@root searchTerm assignee:none anotherSearchTerm label:~Doing');
+        expect(results.searchToken).toBe('searchTerm anotherSearchTerm');
+        expect(results.tokens.length).toBe(3);
+        expect(results.tokens[2]).toBe(results.lastToken);
+
+        expect(results.tokens[0].key).toBe('author');
+        expect(results.tokens[0].value).toBe('root');
+        expect(results.tokens[0].symbol).toBe('@');
+
+        expect(results.tokens[1].key).toBe('assignee');
+        expect(results.tokens[1].value).toBe('none');
+        expect(results.tokens[1].symbol).toBe('');
+
+        expect(results.tokens[2].key).toBe('label');
+        expect(results.tokens[2].value).toBe('Doing');
+        expect(results.tokens[2].symbol).toBe('~');
+      });
+    });
+  });
+})();