Added simple cases for JSX components to increase the coverage

src/components/ActionButton.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import ActionButton from "./ActionButton";
+
+test('rendering does not crash', () => {
+  render(<ActionButton>Text</ActionButton>);
+});

src/components/Avatar.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import Avatar from "./Avatar";
+
+test('rendering does not crash', () => {
+  render(<Avatar />);
+});

src/components/CardImage.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import CardImage from "./CardImage";
+
+test('rendering does not crash', () => {
+  render(<CardImage/>);
+});

src/components/ChipImage.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import ChipImage from "./ChipImage";
+
+test('rendering does not crash', () => {
+  render(<ChipImage/>);
+});

src/components/GithubProjectLink.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import GithubProjectLink from "./GithubProjectLink";
+
+test('rendering does not crash', () => {
+  render(<GithubProjectLink/>);
+});

src/components/MessageBar.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import MessageBar from "./MessageBar";
+
+test('rendering does not crash', () => {
+  render(<MessageBar
+    playerId="player"
+    eventLogs={[]}
+    messages={[]}
+    names={new Map<string, string>()}
+  />);
+});

src/components/Modal.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import Modal from "./Modal";
+
+test('rendering does not crash', () => {
+  render(<Modal/>);
+});

src/components/PlayerAvatar.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import PlayerAvatar from "./PlayerAvatar";
+
+test('rendering does not crash', () => {
+  render(<PlayerAvatar playerId="player"/>);
+});

src/components/ScoreBoardAndToggle.test.tsx

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+import React from 'react';
+import { render } from '@testing-library/react';
+import ScoreBoardAndToggle from "./ScoreBoardAndToggle";
+
+test('rendering does not crash', () => {
+  render(<ScoreBoardAndToggle
+    scoreBoard={new Map()}
+    totalDebt={new Map()}
+    bankrolls={new Map()}
+    names={new Map()}/>);
+});