Created
March 24, 2021 13:43
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lww-test
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| test("merge - scene#1", async () => { | |
| let cloud = new Graph(); | |
| // initial state on cloud | |
| const v1 = cloud.addVertex("v1"); | |
| const v2 = cloud.addVertex("v2"); | |
| const v3 = cloud.addVertex("v3"); | |
| const v4 = cloud.addVertex("v4"); | |
| // sync from cloud | |
| let userA = new Graph(); | |
| userA = userA.merge(cloud); | |
| let userB = new Graph(); | |
| userB = userB.merge(cloud); | |
| expect(userA.adjacencyList).toEqual(cloud.adjacencyList); | |
| expect(userB.adjacencyList).toEqual(cloud.adjacencyList); | |
| // Firstly, userA add a new vertex | |
| const v5 = userA.addVertex("v5"); | |
| // In the **same time**, userB connect v1 to v2 | |
| userB.addEdge(v1, v2); | |
| await delay(); | |
| // userA's network is better than userB now, she sync to the cloud first | |
| cloud = cloud.merge(userA); | |
| // now, cloud should have vertex v5 | |
| expect(cloud.isInGraph(v5)).toBe(true); | |
| // userA has vertex v5 too. But she doesn't sync from cloud now | |
| expect(userA.isInGraph(v5)).toBe(true); | |
| await delay(); | |
| // userB successfully connected to cloud now, she start to sync | |
| cloud = cloud.merge(userB); | |
| // the data in cloud is the most fresh, it has both of the users changes | |
| expect(cloud.isInGraph(v5)).toBe(true); | |
| expect(cloud.isAdjacency(v1, v2)); | |
| // but userA hasn't sync from cloud, so she wouldn't have v1->v2 edge: | |
| expect(userA.adjacencyList).not.toEqual(cloud.adjacencyList); | |
| expect(userA.isAdjacency(v1, v2)).toBe(false); | |
| // userB hasn't sync either, so she wouldn't have v5 | |
| expect(userB.isInGraph(v5)).toBe(false); | |
| await delay(); | |
| // userA and userB both online now, they both syncing | |
| userA = userA.merge(cloud); | |
| userB = userB.merge(cloud); | |
| // now, both of the users should have both updates: | |
| expect(userA.adjacencyList).toEqual(userB.adjacencyList); | |
| expect(userA.isAdjacency(v1, v2)).toBe(true); | |
| expect(userB.isInGraph(v5)).toBe(true); | |
| await delay(); | |
| // user be now can see the v5, she doesn't like this, so she remove it | |
| userB.removeVertex(v5); | |
| await delay(); | |
| // but userA doesn't know that, she makes an edge between v1 and v5 | |
| userA.addEdge(v1, v5); | |
| await delay(); | |
| // userA sync to cloud now | |
| cloud = cloud.merge(userA); | |
| expect(cloud.isAdjacency(v1, v5)).toBe(true); | |
| // userA go on connect v2 to v5 | |
| userA.addEdge(v2, v5); | |
| await delay(); | |
| // userB now sync | |
| cloud = cloud.merge(userB); | |
| // now, because userB removed the v5, it shouldn't in cloud now | |
| expect(cloud.isInGraph(v5)).toBe(false); | |
| // userA doesn't sync from the cloud yet, so she still can see v5 | |
| expect(userA.isInGraph(v5)).toBe(true); | |
| // until she gets online. She will notice that any edges that associated with v5, has gone | |
| userA = userA.merge(cloud); | |
| expect(userA.isInGraph(v5)).toBe(false); | |
| // Now three places are in sync | |
| expect(cloud.adjacencyList).toEqual(userA.adjacencyList) | |
| expect(cloud.adjacencyList).toEqual(userB.adjacencyList); | |
| }); |
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