put mock code in separate file to reuse elsewhere

test/editor/model-test.js

@@ -16,59 +16,7 @@ limitations under the License.
 
 import expect from 'expect';
 import EditorModel from "../../src/editor/model";
-import {PartCreator} from "../../src/editor/parts";
-
-class MockAutoComplete {
-    constructor(updateCallback, partCreator, completions) {
-        this._updateCallback = updateCallback;
-        this._partCreator = partCreator;
-        this._completions = completions;
-        this._part = null;
-    }
-
-    close() {
-        this._updateCallback({close: true});
-    }
-
-    tryComplete(close = true) {
-        const matches = this._completions.filter(o => {
-            return o.resourceId.startsWith(this._part.text);
-        });
-        if (matches.length === 1 && this._part.text.length > 1) {
-            const match = matches[0];
-            let pill;
-            if (match.resourceId[0] === "@") {
-                pill = this._partCreator.userPill(match.label, match.resourceId);
-            } else {
-                pill = this._partCreator.roomPill(match.resourceId);
-            }
-            this._updateCallback({replacePart: pill, close});
-        }
-    }
-
-    // called by EditorModel when typing into pill-candidate part
-    onPartUpdate(part, offset) {
-        this._part = part;
-    }
-}
-
-// MockClient & MockRoom are only used for avatars in room and user pills,
-// which is not tested
-class MockClient {
-    getRooms() { return []; }
-    getRoom() { return null; }
-}
-
-class MockRoom {
-    getMember() { return null; }
-}
-
-function createPartCreator(completions = []) {
-    const autoCompleteCreator = (partCreator) => {
-        return (updateCallback) => new MockAutoComplete(updateCallback, partCreator, completions);
-    };
-    return new PartCreator(autoCompleteCreator, new MockRoom(), new MockClient());
-}
+import {createPartCreator} from "./mock";
 
 function createRenderer() {
     const render = (c) => {