text: import first from "../first";
  
  describe("first function", () => {
    it("Gets the first value if no condition is present", () => {
      const value = first([1, 2, 3]);
  
      expect(value).toEqual(1);
    });
  
    it("Throws an exception if there are no values", () => {
      const firstOnEmptyIterable = () => first([]);
  
      expect(firstOnEmptyIterable).toThrow(Error);
      expect(firstOnEmptyIterable).toThrow(
        "Sequence contains no matching elements"
      );
    });
  
    it("Gets the first item that fills in the condition", () => {
      const value = first([1, 2, 3], t => t % 2 === 0);
  
      expect(value).toEqual(2);
    });
  });
  