Adds initial tests and mock for user resource

src/__mocks__/axios.ts

@@ -0,0 +1,3 @@
+export default {
+  get: jest.fn(() => Promise.resolve({ data: {} }))
+}

src/resources/user.test.ts

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+import mockAxios from 'axios';
+import User from './user';
+
+it('will set assigned filter', async () => {
+  const resource = new User(mockAxios);
+
+  expect(resource.assigned())
+    .toHaveProperty('filters', {
+      assigned: true,
+    });
+});
+
+it('will set location filter using a number', async () => {
+  const resource = new User(mockAxios);
+
+  expect(resource.at(1))
+    .toHaveProperty('filters', {
+      location: 1,
+    });
+});
+
+it('will set location filter using a string', async () => {
+  const resource = new User(mockAxios);
+
+  expect(resource.at('identifier'))
+    .toHaveProperty('filters', {
+      location: 'identifier',
+    });
+});
+
+it('will set service filter using a number', async () => {
+  const resource = new User(mockAxios);
+
+  expect(resource.performing(1))
+    .toHaveProperty('filters', {
+      services: 1,
+    });
+});
+
+it('will set service filter using an array of numbers', async () => {
+  const resource = new User(mockAxios);
+
+  expect(resource.performing([1, 2]))
+    .toHaveProperty('filters', {
+      services: [1, 2],
+    });
+});
+
+it('will set service filter using a string', async () => {
+  const resource = new User(mockAxios);
+
+  expect(resource.performing('identifier'))
+    .toHaveProperty('filters', {
+      services: 'identifier',
+    });
+});
+
+it('will set service filter using an array of strings', async () => {
+  const resource = new User(mockAxios);
+
+  expect(resource.performing(['identifier', 'other']))
+    .toHaveProperty('filters', {
+      services: ['identifier', 'other'],
+    });
+});
+
+it('will set the sortable filter', async () => {
+  const resource = new User(mockAxios);
+
+  expect(resource.sortBy('first_name,-created'))
+    .toHaveProperty('sortable', 'first_name,-created');
+});
+
+it('can string all filterable options together', async () => {
+  const resource = new User(mockAxios);
+
+  const expected = expect(
+    resource.assigned()
+      .at(1)
+      .performing([1, 2])
+      .sortBy('created')
+  );
+
+  expected.toHaveProperty('filters', {
+    assigned: true,
+    location: 1,
+    services: [1, 2],
+  });
+  expected.toHaveProperty('sortable', 'created');
+});