Adds test for register.jsx and snapshot

src/components/Register-snapshot.test.jsx

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+import React from "react";
+import renderer from "react-test-renderer";
+import Register from "./Register";
+
+test("Register Snapshot", () => {
+	const registerFunc = jest.fn();
+
+	const register = renderer.create(<Register register={registerFunc} />);
+
+	const tree = register.toJSON();
+
+	expect(tree).toMatchSnapshot();
+});

src/components/Register.test.jsx

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+import React from "react";
+import { render } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import Register from "./Register";
+
+test("Register inputs", () => {
+	const registerFunc = jest.fn();
+	const register = render(<Register register={registerFunc} />);
+
+	const usernameInput = register.getByRole("textbox", { name: /Username/ });
+	const displayNameInput = register.getByRole("textbox", { name: /Name/ })
+	const passwordInput = register.getByLabelText("Password");
+	const buttonInput = register.getByRole("button", { name: /Sign me up/i });
+
+	const username = "here's a username";
+	const displayName = "testing this is a display name for a person";
+	const pw = "here's a password";
+
+	userEvent.type(usernameInput, username);
+	userEvent.type(displayNameInput, displayName)
+	userEvent.type(passwordInput, pw);
+	userEvent.click(buttonInput);
+	expect(registerFunc).toHaveBeenCalledWith(username, displayName, pw);
+});

src/components/__snapshots__/Register-snapshot.test.jsx.snap

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+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Register Snapshot 1`] = `
+<div
+  className="register-wrapper"
+>
+  <h1>
+    Enter your data to register.
+  </h1>
+  <form
+    onSubmit={[Function]}
+  >
+    <label>
+      <p>
+        Username
+      </p>
+      <input
+        id="username"
+        onChange={[Function]}
+        type="text"
+      />
+    </label>
+    <label>
+      <p>
+        Name
+      </p>
+      <input
+        id="displayName"
+        onChange={[Function]}
+        type="text"
+      />
+    </label>
+    <label>
+      <p>
+        Password
+      </p>
+      <input
+        id="password"
+        onChange={[Function]}
+        type="password"
+      />
+    </label>
+    <div>
+      <button
+        type="submit"
+      >
+        Sign me up
+      </button>
+    </div>
+  </form>
+</div>
+`;