Use axios MockAdapter history in JavaScript tests

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After https://github.com/ctimmerm/axios-mock-adapter/pull/124 has been merged, we can replace

spyOn(axios, 'get');

// ...

expect(axios.get).toHaveBeenCalled();

with

const getCalls = axiosMock.history.find(config => config.method === 'GET');
expect(getCalls.length).toBe(1);

or even

const axiosCalls = axiosMock.history.find(config => config.method === 'GET' && config.url === 'http://expected.url');
expect(axiosCalls.length).toBe(1);