chrome-devtools-frontend/front_end/core/sdk/PreloadingModel.test.ts

Chrome DevTools UI

// Copyright 2023 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as Protocol from '../../generated/protocol.js';
import {createTarget} from '../../testing/EnvironmentHelpers.js';
import {
  describeWithMockConnection,
  dispatchEvent,
} from '../../testing/MockConnection.js';
import {getMainFrame, navigate} from '../../testing/ResourceTreeHelpers.js';
import * as Platform from '../platform/platform.js';

import * as SDK from './sdk.js';

const {urlString} = Platform.DevToolsPath;

describeWithMockConnection('PreloadingModel', () => {
  it('adds and deletes rule sets and preloading attempts', async () => {
    const target = createTarget();
    const model = target.model(SDK.PreloadingModel.PreloadingModel);
    assert.exists(model);

    assert.deepEqual(model.getAllRuleSets(), []);

    const loaderId = getMainFrame(target).loaderId as Protocol.Network.LoaderId;

    dispatchEvent(target, 'Preload.ruleSetUpdated', {
      ruleSet: {
        id: 'ruleSetId:1',
        loaderId,
        sourceText: `
{
  "prefetch":[
    {
      "source": "list",
      "urls": ["/subresource.js"]
    }
  ]
}
`,
      },
    });
    dispatchEvent(target, 'Preload.preloadingAttemptSourcesUpdated', {
      loaderId,
      preloadingAttemptSources: [
        {
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: 'https://example.com/subresource.js',
          },
          ruleSetIds: ['ruleSetId:1'],
          nodeIds: [1],
        },
      ],
    });
    dispatchEvent(target, 'Preload.prefetchStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prefetch,
        url: 'https://example.com/subresource.js',
      },
      pipelineId: 'pipelineId:1',
      status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
      requestId: 'requestId:1',
    });

    assert.deepEqual(model.getAllRuleSets(), [
      {
        id: 'ruleSetId:1' as Protocol.Preload.RuleSetId,
        value: {
          id: 'ruleSetId:1' as Protocol.Preload.RuleSetId,
          loaderId,
          sourceText: `
{
  "prefetch":[
    {
      "source": "list",
      "urls": ["/subresource.js"]
    }
  ]
}
`,
        },
      },
    ]);
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prefetch:https://example.com/subresource.js:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/subresource.js`,
          },
          pipelineId: 'pipelineId:1' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prefetchStatus: null,
          requestId: 'requestId:1' as Protocol.Network.RequestId,
          ruleSetIds: ['ruleSetId:1'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);

    dispatchEvent(target, 'Preload.ruleSetUpdated', {
      ruleSet: {
        id: 'ruleSetId:2',
        loaderId,
        sourceText: `
{
  "prerender":[
    {
      "source": "list",
      "urls": ["/page.html"]
    }
  ]
}
`,
      },
    });
    dispatchEvent(target, 'Preload.preloadingAttemptSourcesUpdated', {
      loaderId,
      preloadingAttemptSources: [
        {
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: 'https://example.com/subresource.js',
          },
          ruleSetIds: ['ruleSetId:1'],
          nodeIds: [1],
        },
        {
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prerender,
            url: 'https://example.com/page.html',
          },
          ruleSetIds: ['ruleSetId:2'],
          nodeIds: [2],
        },
      ],
    });
    dispatchEvent(target, 'Preload.prerenderStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prerender,
        url: 'https://example.com/page.html',
      },
      pipelineId: 'pipelineId:2',
      status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
    });

    assert.deepEqual(model.getAllRuleSets(), [
      {
        id: 'ruleSetId:1' as Protocol.Preload.RuleSetId,
        value: {
          id: 'ruleSetId:1' as Protocol.Preload.RuleSetId,
          loaderId,
          sourceText: `
{
  "prefetch":[
    {
      "source": "list",
      "urls": ["/subresource.js"]
    }
  ]
}
`,
        },
      },
      {
        id: 'ruleSetId:2' as Protocol.Preload.RuleSetId,
        value: {

          id: 'ruleSetId:2' as Protocol.Preload.RuleSetId,
          loaderId,
          sourceText: `
{
  "prerender":[
    {
      "source": "list",
      "urls": ["/page.html"]
    }
  ]
}
`,
        },
      },
    ]);
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prefetch:https://example.com/subresource.js:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/subresource.js`,
          },
          pipelineId: 'pipelineId:1' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prefetchStatus: null,
          requestId: 'requestId:1' as Protocol.Network.RequestId,
          ruleSetIds: ['ruleSetId:1'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1] as Protocol.DOM.BackendNodeId[],
        },
      },
      {
        id: `${loaderId}:Prerender:https://example.com/page.html:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prerender,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prerender,
            url: urlString`https://example.com/page.html`,
          },
          pipelineId: 'pipelineId:2' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prerenderStatus: null,
          disallowedMojoInterface: null,
          mismatchedHeaders: null,
          ruleSetIds: ['ruleSetId:2'] as Protocol.Preload.RuleSetId[],
          nodeIds: [2] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);

    dispatchEvent(target, 'Preload.ruleSetRemoved', {
      id: 'ruleSetId:1',
    });
    dispatchEvent(target, 'Preload.preloadingAttemptSourcesUpdated', {
      loaderId,
      preloadingAttemptSources: [
        {
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prerender,
            url: 'https://example.com/page.html',
          },
          ruleSetIds: ['ruleSetId:2'],
          nodeIds: [2],
        },
      ],
    });
    dispatchEvent(target, 'Preload.prefetchStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prefetch,
        url: 'https://example.com/subresource.js',
      },
      pipelineId: 'pipelineId:1',
      status: SDK.PreloadingModel.PreloadingStatus.FAILURE,
      prefetchStatus: Protocol.Preload.PrefetchStatus.PrefetchEvictedAfterCandidateRemoved,
      requestId: 'requestId:1',
    });

    assert.deepEqual(model.getAllRuleSets(), [
      {
        id: 'ruleSetId:2' as Protocol.Preload.RuleSetId,
        value: {
          id: 'ruleSetId:2' as Protocol.Preload.RuleSetId,
          loaderId,
          sourceText: `
{
  "prerender":[
    {
      "source": "list",
      "urls": ["/page.html"]
    }
  ]
}
`,
        },
      },
    ]);
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prerender:https://example.com/page.html:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prerender,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prerender,
            url: urlString`https://example.com/page.html`,
          },
          pipelineId: 'pipelineId:2' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prerenderStatus: null,
          disallowedMojoInterface: null,
          mismatchedHeaders: null,
          ruleSetIds: ['ruleSetId:2'] as Protocol.Preload.RuleSetId[],
          nodeIds: [2] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);
  });

  it('registers preloading attempt with status NotTriggered', async () => {
    const target = createTarget();
    const model = target.model(SDK.PreloadingModel.PreloadingModel);
    assert.exists(model);

    assert.deepEqual(model.getAllRuleSets(), []);

    const loaderId = getMainFrame(target).loaderId as Protocol.Network.LoaderId;
    dispatchEvent(target, 'Preload.ruleSetUpdated', {
      ruleSet: {
        id: 'ruleSetId:1',
        loaderId,
        sourceText: `
{
  "prefetch":[
    {
      "source": "list",
      "urls": ["/subresource.js"]
    }
  ]
}
`,
      },
    });
    dispatchEvent(target, 'Preload.preloadingAttemptSourcesUpdated', {
      loaderId,
      preloadingAttemptSources: [
        {
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: 'https://example.com/subresource.js',
          },
          ruleSetIds: ['ruleSetId:1'],
          nodeIds: [1],
        },
      ],
    });

    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prefetch:https://example.com/subresource.js:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/subresource.js`,
          },
          pipelineId: null,
          status: SDK.PreloadingModel.PreloadingStatus.NOT_TRIGGERED,
          prefetchStatus: null,
          // Invalid request id
          requestId: '' as Protocol.Network.RequestId,
          ruleSetIds: ['ruleSetId:1'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);
  });

  it('clears rule sets and preloading attempts for previous pages', async () => {
    const target = createTarget();
    const model = target.model(SDK.PreloadingModel.PreloadingModel);
    assert.exists(model);

    assert.deepEqual(model.getAllRuleSets(), []);
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), []);

    let loaderId = getMainFrame(target).loaderId as Protocol.Network.LoaderId;

    dispatchEvent(target, 'Preload.ruleSetUpdated', {
      ruleSet: {
        id: 'ruleSetId:1',
        loaderId,
        sourceText: `
{
  "prefetch": [
    {
      "source": "list",
      "urls": ["/subresource1.js"]
    }
  ]
}
`,
      },
    });
    dispatchEvent(target, 'Preload.preloadingAttemptSourcesUpdated', {
      loaderId,
      preloadingAttemptSources: [
        {
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: 'https://example.com/subresource1.js',
          },
          ruleSetIds: ['ruleSetId:1'],
          nodeIds: [1],
        },
      ],
    });
    dispatchEvent(target, 'Preload.prefetchStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prefetch,
        url: 'https://example.com/subresource1.js',
      },
      pipelineId: 'pipelineId:1',
      status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
    });

    loaderId = 'loaderId:2' as Protocol.Network.LoaderId;
    navigate(getMainFrame(target), {loaderId});

    dispatchEvent(target, 'Preload.ruleSetUpdated', {
      ruleSet: {
        id: 'ruleSetId:2',
        loaderId,
        sourceText: `
{
  "prefetch": [
    {
      "source": "list",
      "urls": ["/subresource2.js"]
    }
  ]
}
`,
      },
    });
    dispatchEvent(target, 'Preload.preloadingAttemptSourcesUpdated', {
      loaderId,
      preloadingAttemptSources: [
        {
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: 'https://example.com/subresource2.js',
          },
          ruleSetIds: ['ruleSetId:2'],
          nodeIds: [2],
        },
      ],
    });
    dispatchEvent(target, 'Preload.prefetchStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prefetch,
        url: 'https://example.com/subresource2.js',
      },
      pipelineId: 'pipelineId:1',
      status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
      requestId: 'requestId:1',
    });

    assert.deepEqual(model.getAllRuleSets(), [
      {
        id: 'ruleSetId:2' as Protocol.Preload.RuleSetId,
        value: {
          id: 'ruleSetId:2' as Protocol.Preload.RuleSetId,
          loaderId,
          sourceText: `
{
  "prefetch": [
    {
      "source": "list",
      "urls": ["/subresource2.js"]
    }
  ]
}
`,
        },
      },
    ]);
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prefetch:https://example.com/subresource2.js:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/subresource2.js`,
          },
          pipelineId: 'pipelineId:1' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prefetchStatus: null,
          requestId: 'requestId:1' as Protocol.Network.RequestId,
          ruleSetIds: ['ruleSetId:2'] as Protocol.Preload.RuleSetId[],
          nodeIds: [2] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);
  });

  it('filters preloading attempts by rule set id', async () => {
    const target = createTarget();
    const model = target.model(SDK.PreloadingModel.PreloadingModel);
    assert.exists(model);

    assert.deepEqual(model.getAllRuleSets(), []);
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), []);

    const loaderId = getMainFrame(target).loaderId as Protocol.Network.LoaderId;

    dispatchEvent(target, 'Preload.ruleSetUpdated', {
      ruleSet: {
        id: 'ruleSetId:1',
        loaderId,
        sourceText: `
{
  "prefetch": [
    {
      "source": "list",
      "urls": ["/subresource12.js"]
    }
  ]
}
`,
      },
    });
    dispatchEvent(target, 'Preload.ruleSetUpdated', {
      ruleSet: {
        id: 'ruleSetId:2',
        loaderId,
        sourceText: `
{
  "prefetch": [
    {
      "source": "list",
      "urls": ["/subresource12.js", "/subresource2.js"]
    }
  ]
}
`,
      },
    });
    dispatchEvent(target, 'Preload.preloadingAttemptSourcesUpdated', {
      loaderId,
      preloadingAttemptSources: [
        {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: 'https://example.com/subresource12.js',
          },
          ruleSetIds: ['ruleSetId:1', 'ruleSetId:2'],
          nodeIds: [1, 2],
        },
        {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: 'https://example.com/subresource2.js',
          },
          ruleSetIds: ['ruleSetId:2'],
          nodeIds: [2],
        },
      ],
    });
    dispatchEvent(target, 'Preload.prefetchStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prefetch,
        url: 'https://example.com/subresource12.js',
      },
      pipelineId: 'pipelineId:1',
      status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
      requestId: 'requestId:1',
    });
    dispatchEvent(target, 'Preload.prefetchStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prefetch,
        url: 'https://example.com/subresource2.js',
      },
      pipelineId: 'pipelineId:2',
      status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
      requestId: 'requestId:2',
    });

    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prefetch:https://example.com/subresource12.js:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/subresource12.js`,
          },
          pipelineId: 'pipelineId:1' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prefetchStatus: null,
          requestId: 'requestId:1' as Protocol.Network.RequestId,
          ruleSetIds: ['ruleSetId:1', 'ruleSetId:2'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1, 2] as Protocol.DOM.BackendNodeId[],
        },
      },
      {
        id: `${loaderId}:Prefetch:https://example.com/subresource2.js:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/subresource2.js`,
          },
          pipelineId: 'pipelineId:2' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prefetchStatus: null,
          requestId: 'requestId:2' as Protocol.Network.RequestId,
          ruleSetIds: ['ruleSetId:2'] as Protocol.Preload.RuleSetId[],
          nodeIds: [2] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);

    assert.deepEqual(model.getRepresentativePreloadingAttempts('ruleSetId:1' as Protocol.Preload.RuleSetId), [
      {
        id: `${loaderId}:Prefetch:https://example.com/subresource12.js:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/subresource12.js`,
          },
          pipelineId: 'pipelineId:1' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prefetchStatus: null,
          requestId: 'requestId:1' as Protocol.Network.RequestId,
          ruleSetIds: ['ruleSetId:1', 'ruleSetId:2'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1, 2] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);

    assert.deepEqual(model.getRepresentativePreloadingAttempts('ruleSetId:2' as Protocol.Preload.RuleSetId), [
      {
        id: `${loaderId}:Prefetch:https://example.com/subresource12.js:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/subresource12.js`,
          },
          pipelineId: 'pipelineId:1' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prefetchStatus: null,
          requestId: 'requestId:1' as Protocol.Network.RequestId,
          ruleSetIds: ['ruleSetId:1', 'ruleSetId:2'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1, 2] as Protocol.DOM.BackendNodeId[],
        },
      },
      {
        id: `${loaderId}:Prefetch:https://example.com/subresource2.js:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/subresource2.js`,
          },
          pipelineId: 'pipelineId:2' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prefetchStatus: null,
          requestId: 'requestId:2' as Protocol.Network.RequestId,
          ruleSetIds: ['ruleSetId:2'] as Protocol.Preload.RuleSetId[],
          nodeIds: [2] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);
  });

  it('regards attempts with strongest action as representative', async () => {
    const target = createTarget();
    const model = target.model(SDK.PreloadingModel.PreloadingModel);
    assert.exists(model);

    assert.deepEqual(model.getAllRuleSets(), []);
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), []);

    const loaderId = getMainFrame(target).loaderId as Protocol.Network.LoaderId;

    dispatchEvent(target, 'Preload.ruleSetUpdated', {
      ruleSet: {
        id: 'ruleSetId:1',
        loaderId,
        sourceText: `
{
  "prerender": [
    {
      "source": "list",
      "urls": ["/prerendered.html"]
    }
  ]
}
`,
      },
    });
    dispatchEvent(target, 'Preload.preloadingAttemptSourcesUpdated', {
      loaderId,
      preloadingAttemptSources: [
        {
          action: Protocol.Preload.SpeculationAction.Prerender,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prerender,
            url: 'https://example.com/prerendered.html',
          },
          ruleSetIds: ['ruleSetId:1'],
          nodeIds: [1],
        },
      ],
    });

    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prerender:https://example.com/prerendered.html:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prerender,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prerender,
            url: urlString`https://example.com/prerendered.html`,
          },
          pipelineId: null,
          status: SDK.PreloadingModel.PreloadingStatus.NOT_TRIGGERED,
          prerenderStatus: null,
          disallowedMojoInterface: null,
          mismatchedHeaders: null,
          ruleSetIds: ['ruleSetId:1'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);

    dispatchEvent(target, 'Preload.prefetchStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prefetch,
        url: 'https://example.com/prerendered.html',
      },
      pipelineId: 'pipelineId:1',
      status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
      requestId: 'requestId:1',
    });

    // Here, we get two different attemtps, which should sit in the same pipeline actually.
    // It is because
    //
    // - The `NOT_TRIGGERED` entry is synthesized from
    //   `Preload.preloadingAttemptSourcesUpdated` event.
    // - It is associated with the following entry for *prerender*, not prefetch.
    //
    // We admit the phenomenon as prefetch and prerender are triggered simultaneously and we don't
    // expect the duration is very short that these entries are shown.
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prerender:https://example.com/prerendered.html:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prerender,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prerender,
            url: urlString`https://example.com/prerendered.html`,
          },
          pipelineId: null,
          status: SDK.PreloadingModel.PreloadingStatus.NOT_TRIGGERED,
          prerenderStatus: null,
          disallowedMojoInterface: null,
          mismatchedHeaders: null,
          ruleSetIds: ['ruleSetId:1'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1] as Protocol.DOM.BackendNodeId[],
        },
      },
      {
        id: `${loaderId}:Prefetch:https://example.com/prerendered.html:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prefetch,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prefetch,
            url: urlString`https://example.com/prerendered.html`,
          },
          pipelineId: 'pipelineId:1' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prefetchStatus: null,
          requestId: 'requestId:1' as Protocol.Network.RequestId,
          ruleSetIds: [] as Protocol.Preload.RuleSetId[],
          nodeIds: [] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);

    dispatchEvent(target, 'Preload.prerenderStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prerender,
        url: 'https://example.com/prerendered.html',
      },
      pipelineId: 'pipelineId:1',
      status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
    });

    // Converges to an entry.
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prerender:https://example.com/prerendered.html:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prerender,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prerender,
            url: urlString`https://example.com/prerendered.html`,
          },
          pipelineId: 'pipelineId:1' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.RUNNING,
          prerenderStatus: null,
          disallowedMojoInterface: null,
          mismatchedHeaders: null,
          ruleSetIds: ['ruleSetId:1'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);

    dispatchEvent(target, 'Preload.prefetchStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prefetch,
        url: 'https://example.com/prerendered.html',
      },
      pipelineId: 'pipelineId:1',
      status: SDK.PreloadingModel.PreloadingStatus.SUCCESS,
      requestId: 'requestId:1',
    });
    dispatchEvent(target, 'Preload.prerenderStatusUpdated', {
      key: {
        loaderId,
        action: Protocol.Preload.SpeculationAction.Prerender,
        url: 'https://example.com/prerendered.html',
      },
      pipelineId: 'pipelineId:1',
      status: SDK.PreloadingModel.PreloadingStatus.FAILURE,
      prerenderStatus: Protocol.Preload.PrerenderFinalStatus.MojoBinderPolicy,
      disallowedMojoInterface: 'device.mojom.GamepadMonitor',
    });

    // The prerender is the representative of the pipeline even if it failed.
    assert.deepEqual(model.getRepresentativePreloadingAttempts(null), [
      {
        id: `${loaderId}:Prerender:https://example.com/prerendered.html:undefined`,
        value: {
          action: Protocol.Preload.SpeculationAction.Prerender,
          key: {
            loaderId,
            action: Protocol.Preload.SpeculationAction.Prerender,
            url: urlString`https://example.com/prerendered.html`,
          },
          pipelineId: 'pipelineId:1' as Protocol.Preload.PreloadPipelineId,
          status: SDK.PreloadingModel.PreloadingStatus.FAILURE,
          prerenderStatus: Protocol.Preload.PrerenderFinalStatus.MojoBinderPolicy,
          disallowedMojoInterface: 'device.mojom.GamepadMonitor',
          mismatchedHeaders: null,
          ruleSetIds: ['ruleSetId:1'] as Protocol.Preload.RuleSetId[],
          nodeIds: [1] as Protocol.DOM.BackendNodeId[],
        },
      },
    ]);
  });
});