Adding MetricBar tests

Signed-off-by: Alex Andreev <alex.andreev.email@gmail.com>

src/renderer/components/metric-bar/metric-bar.test.tsx

@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) OpenLens Authors. All rights reserved.
+ * Licensed under MIT License. See LICENSE in root directory for more information.
+ */
+
+import React from "react";
+import { render } from "@testing-library/react";
+import "@testing-library/jest-dom/extend-expect";
+import { MetricBar } from ".";
+
+describe("<MetricBar/>", () => {
+  it("renders <MetricBar /> w/o errors", async () => {
+
+    const { container } = render(<MetricBar value={50} max={100} />);
+
+    expect(container.querySelector("[data-testid='metric-bar']")).toBeInTheDocument();
+  });
+
+  it("shows percent values", () => {
+    const { getByText } = render(<MetricBar value={590} max={1589} />);
+
+    expect(getByText("37.13%")).toBeInTheDocument();
+  });
+
+  it("doesn't show percent values if no 'showPercent' flag set", () => {
+    const { queryByText } = render(<MetricBar value={15} max={100} showPercent={false} />);
+
+    expect(queryByText("15%")).not.toBeInTheDocument();
+  });
+
+  it("adds 'warning' class to <VerticalBar/> line", () => {
+    const { container } = render(<MetricBar value={86} max={100} warningPercentage={85} />);
+
+    expect(container.querySelector("[data-testid='vertical-bar'] > div")).toHaveClass("warning");
+  });
+
+  it("does not adds 'warning' class if 'changeColorOnWarning' not set", () => {
+    const { container } = render(<MetricBar value={86} max={100} changeColorOnWarning={false} />);
+
+    expect(container.querySelector("[data-testid='vertical-bar'] > div")).not.toHaveClass("warning");
+  });
+});