Method validateSnapshot

test/common/heap.js:120–169

(rootName, expected, { loose = false } = {})

  // Validate the v8 heap snapshot
  validateSnapshot(rootName, expected, { loose = false } = {}) {
    const rootNodes = this.snapshot.filter(
      (node) => node.name === rootName && node.type !== 'string');
    if (loose) {
      assert(rootNodes.length >= expected.length,
             `Expect to find at least ${expected.length} '${rootName}', ` +
             `found ${rootNodes.length}`);
    } else {
      assert.strictEqual(
        rootNodes.length, expected.length,
        `Expect to find ${expected.length} '${rootName}', ` +
        `found ${rootNodes.length}`);
    }

    for (const expectation of expected) {
      if (expectation.children) {
        for (const expectedEdge of expectation.children) {
          const check = typeof expectedEdge === 'function' ? expectedEdge :
            (edge) => (isEdge(edge, expectedEdge));
          const hasChild = rootNodes.some(
            (node) => node.outgoingEdges.some(check),
          );
          // Don't use assert with a custom message here. Otherwise the
          // inspection in the message is done eagerly and wastes a lot of CPU
          // time.
          if (!hasChild) {
            throw new Error(
              'expected to find child ' +
              `${util.inspect(expectedEdge)} in ${inspectNode(rootNodes)}`);
          }
        }
      }

      if (expectation.detachedness !== undefined) {
        const matchedNodes = rootNodes.filter(
          (node) => node.detachedness === expectation.detachedness);
        if (loose) {
          assert(matchedNodes.length >= rootNodes.length,
                 `Expect to find at least ${rootNodes.length} with ` +
                `detachedness ${expectation.detachedness}, ` +
                `found ${matchedNodes.length}`);
        } else {
          assert.strictEqual(
            matchedNodes.length, rootNodes.length,
            `Expect to find ${rootNodes.length} with detachedness ` +
            `${expectation.detachedness},  found ${matchedNodes.length}`);
        }
      }
    }
  }

  // Validate our internal embedded graph representation
  validateGraph(rootName, expected, { loose = false } = {}) {