gradTest.test.js

function createMenuData(data) {
  var parents = [];
  var children = [];
  var families = [];
  
  for (i=0; i<data.length; i++) {
    var splitter = data[i].split("/");
    const parent = splitter[0];
    if (splitter[1]) {
      const child = splitter[1];
      children.push(child);
    }
    if (!parents.includes(parent)){
      parents.push(parent);
    }
  };

  for (i=0; i<parents.length;i++) {
    const parent = parents[i];
    var family = {title:parent, data:[]};
    for (x=0; x<children.length; x++) {
      const child = children[x];
      if (child.includes(parent)){
        family.data.push(child);
      }
    }
    families.push(family);
  }
  console.log(families);
  return families;
}

describe("menu Data Generator", () => {
    it("creates correct data structure ", () => {
      const data = [
        "parent1/parent1child",
        "parent1/parent1child2",
        "parent2/parent2child",
        "parent2/parent2child2",
        "parent1/parent1child3",
        "parent3",
        "parent3/parent3child1",
        "parent4"
      ];

      const expectedResult = [
        {
          title: "parent1",
          data: ["parent1child", "parent1child2", "parent1child3"]
        },
        { title: "parent2", data: ["parent2child", "parent2child2"] },
        { title: "parent3", data: ["parent3child1"] }
      ];

      const actualResult = createMenuData(data);
      expect(actualResult).toMatchObject(expectedResult);
    });
  });