describe("first suite", function() {
  it("first test", function(done) {
    expect(true).toBeTruthy();
    setTimeout(done, 1000);
  });

  it("second test", function(done) {
    expect(true).toBeTruthy();
    setTimeout(done, 1000);
  });
});

describe("second suite", function() {
  it("first test", function(done) {
    expect(true).toBeTruthy();
    setTimeout(done, 1000);
  });

  it("second test", function(done) {
    expect(true).toBeTruthy();
    setTimeout(done, 1000);
  });
});

npm i karma-parallel

module.exports = function(config) {
  config.set({
    frameworks: ['jasmine', 'parallel']
  });
};