test: add test for svelte components

src/components/layout/InputGroupTest.svelte

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+<!-- InputGroupTest.svelte -->
+<script>
+import InputGroup from './InputGroup.svelte';
+</script>
+<InputGroup>
+<input type="text" data-testid="input1" />
+<input type="text" data-testid="input2" />
+<button data-testid="button">Кнопка</button>
+</InputGroup>

src/components/layout/SettingsGridTest.svelte

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+<!-- SettingsGridTest.svelte -->
+<script>
+import SettingsGrid from './SettingsGrid.svelte';
+</script>
+<SettingsGrid>
+<div data-testid="item1">Item 1</div>
+<div data-testid="item2">Item 2</div>
+<div data-testid="item3">Item 3</div>
+</SettingsGrid>

src/components/layout/SettingsRowTest.svelte

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+<!-- SettingsRowTest.svelte -->
+<script>
+import SettingsRow from './SettingsRow.svelte';
+</script>
+<SettingsRow label="Test Label">
+<input type="text" data-testid="test-input" />
+</SettingsRow>

tests/unit/components/layout/AppHeader.test.ts

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+import { render, screen, fireEvent } from "@testing-library/svelte";
+import { describe, expect, it, beforeEach } from "vitest";
+import { themeState } from "$states/theme.svelte";
+import AppHeader from "$components/layout/AppHeader.svelte";
+
+describe("AppHeader.svelte", () => {
+  beforeEach(() => {
+    themeState.theme = "dark";
+  });
+
+  it("should render header with title", () => {
+    render(AppHeader);
+
+    expect(screen.getByRole("banner")).toBeInTheDocument();
+    expect(screen.getByText("Twitch Panels")).toBeInTheDocument();
+  });
+
+  it("should render theme toggle button", () => {
+    const { container } = render(AppHeader);
+
+    const toggleButton = container.querySelector(".theme-toggle");
+    expect(toggleButton).toBeInTheDocument();
+  });
+
+  it("should toggle theme on button click", async () => {
+    const { container } = render(AppHeader);
+
+    const toggleButton = container.querySelector(".theme-toggle");
+
+    themeState.theme = "dark";
+    await fireEvent.click(toggleButton);
+    expect(themeState.theme).toBe("light");
+
+    await fireEvent.click(toggleButton);
+    expect(themeState.theme).toBe("dark");
+  });
+
+  it("should have correct aria-label on toggle button", () => {
+    const { container } = render(AppHeader);
+
+    const toggleButton = container.querySelector(".theme-toggle");
+    expect(toggleButton).toHaveAttribute("aria-label", "Toggle theme");
+  });
+});

tests/unit/components/layout/Card.test.ts

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+import { render, screen } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
+import { createRawSnippet } from "svelte";
+import Card from "$components/layout/Card.svelte";
+
+describe("Card.svelte", () => {
+  it("should render with string title", () => {
+    const childrenSnippet = createRawSnippet(() => ({
+      render: () => "<div>Test content</div>",
+    }));
+
+    const { container } = render(Card, {
+      props: {
+        title: "Test Title",
+        children: childrenSnippet,
+      },
+    });
+
+    expect(container.querySelector(".card-title")).toHaveTextContent("Test Title");
+    expect(container.querySelector(".card-body")).toHaveTextContent("Test content");
+  });
+
+  it("should render with snippet title", () => {
+    const titleSnippet = createRawSnippet(() => ({
+      render: () => "<span>Snippet Title</span>",
+    }));
+    const childrenSnippet = createRawSnippet(() => ({
+      render: () => "<div>Test content</div>",
+    }));
+
+    const { container } = render(Card, {
+      props: {
+        title: titleSnippet,
+        children: childrenSnippet,
+      },
+    });
+
+    expect(container.querySelector(".card-title")).toHaveTextContent("Snippet Title");
+    expect(container.querySelector(".card-body")).toHaveTextContent("Test content");
+  });
+
+  it("should render with titleSnippet", () => {
+    const titleSnippet = createRawSnippet(() => ({
+      render: () => "<button>Action</button>",
+    }));
+    const childrenSnippet = createRawSnippet(() => ({
+      render: () => "<div>Test content</div>",
+    }));
+
+    const { container } = render(Card, {
+      props: {
+        title: "Test Title",
+        children: childrenSnippet,
+        titleSnippet: titleSnippet,
+      },
+    });
+
+    expect(container.querySelector(".card-title")).toHaveTextContent("Test Title");
+    expect(container.querySelector(".card-body")).toHaveTextContent("Test content");
+    expect(container.querySelector(".card-snippet")).toHaveTextContent("Action");
+  });
+
+  it("should render without titleSnippet", () => {
+    const childrenSnippet = createRawSnippet(() => ({
+      render: () => "<div>Test content</div>",
+    }));
+
+    const { container } = render(Card, {
+      props: {
+        title: "Test Title",
+        children: childrenSnippet,
+      },
+    });
+
+    expect(container.querySelector(".card-title")).toHaveTextContent("Test Title");
+    expect(container.querySelector(".card-body")).toHaveTextContent("Test content");
+  });
+});

tests/unit/components/layout/InputGroup.test.ts

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+import InputGroupTest from "$components/layout/InputGroupTest.svelte";
+import { render, screen } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
+
+describe("InputGroup.svelte", () => {
+  it("should render multiple children using a wrapper component", () => {
+    render(InputGroupTest);
+
+    const inputGroup = document.querySelector(".input-group");
+    expect(inputGroup).toBeInTheDocument();
+
+    expect(screen.getByTestId("input1")).toBeInTheDocument();
+    expect(screen.getByTestId("input2")).toBeInTheDocument();
+    expect(screen.getByTestId("button")).toBeInTheDocument();
+
+    const inputs = inputGroup!.querySelectorAll("input");
+    expect(inputs.length).toBe(2);
+  });
+});

tests/unit/components/layout/SettingsGrid.test.ts

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+import { render, screen } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
+import SettingsGridTest from "$components/layout/SettingsGridTest.svelte";
+
+describe("SettingsGrid.svelte", () => {
+  it("should render multiple children using a wrapper component", () => {
+    render(SettingsGridTest);
+
+    const settingsGrid = document.querySelector(".settings-grid");
+    expect(settingsGrid).toBeInTheDocument();
+
+    expect(screen.getByTestId("item1")).toBeInTheDocument();
+    expect(screen.getByTestId("item2")).toBeInTheDocument();
+    expect(screen.getByTestId("item3")).toBeInTheDocument();
+
+    const items = settingsGrid.querySelectorAll('div[data-testid]');
+    expect(items.length).toBe(3);
+  });
+});

tests/unit/components/layout/SettingsRow.test.ts

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+import { render, screen } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
+import SettingsRowTest from "$components/layout/SettingsRowTest.svelte";
+
+describe("SettingsRow.svelte", () => {
+  it("should render label and children using a wrapper component", () => {
+    render(SettingsRowTest);
+
+    const settingRow = document.querySelector(".setting-row");
+    expect(settingRow).toBeInTheDocument();
+
+    expect(screen.getByText("Test Label")).toBeInTheDocument();
+    expect(screen.getByTestId("test-input")).toBeInTheDocument();
+
+    const label = settingRow.querySelector(".setting-label");
+    expect(label).toBeInTheDocument();
+    expect(label.textContent).toBe("Test Label");
+
+    const control = settingRow.querySelector(".setting-control");
+    expect(control).toBeInTheDocument();
+    expect(control.querySelector('input[data-testid="test-input"]')).toBeInTheDocument();
+  });
+});

tests/unit/components/text/TextInput.test.ts

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+import { render, screen, fireEvent } from "@testing-library/svelte";
+import { describe, expect, it, vi } from "vitest";
+import TextInput from "$components/text/TextInput.svelte";
+
+describe("TextInput.svelte", () => {
+  it("should render with initial value", () => {
+    const { container } = render(TextInput, {
+      props: {
+        text: "Test text",
+        onenter: vi.fn(),
+      },
+    });
+
+    const input = container.querySelector(".text-input");
+    expect(input).toBeInTheDocument();
+    expect(input).toHaveValue("Test text");
+  });
+
+  it("should update value on input", async () => {
+    const { container } = render(TextInput, {
+      props: {
+        text: "Initial",
+        onenter: vi.fn(),
+      },
+    });
+
+    const input = container.querySelector(".text-input");
+    await fireEvent.input(input, { target: { value: "Updated text" } });
+
+    expect(input).toHaveValue("Updated text");
+  });
+
+  it("should call onenter when Enter key is pressed", async () => {
+    const onenter = vi.fn();
+    const { container } = render(TextInput, {
+      props: {
+        text: "Test",
+        onenter,
+      },
+    });
+
+    const input = container.querySelector(".text-input");
+    await fireEvent.keyDown(input, { key: "Enter" });
+
+    expect(onenter).toHaveBeenCalledTimes(1);
+  });
+
+  it("should not call onenter when other keys are pressed", async () => {
+    const onenter = vi.fn();
+    const { container } = render(TextInput, {
+      props: {
+        text: "Test",
+        onenter,
+      },
+    });
+
+    const input = container.querySelector(".text-input");
+    await fireEvent.keyDown(input, { key: "Escape" });
+    await fireEvent.keyDown(input, { key: "Tab" });
+
+    expect(onenter).not.toHaveBeenCalled();
+  });
+
+  it("should have correct placeholder", () => {
+    const { container } = render(TextInput, {
+      props: {
+        text: "",
+        onenter: vi.fn(),
+      },
+    });
+
+    const input = container.querySelector(".text-input");
+    expect(input).toBeInTheDocument();
+    expect(input).toHaveAttribute("placeholder", "Введите текст...");
+  });
+});

tests/unit/components/ui/Alignment.test.ts

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+import { render, screen, fireEvent } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
+import Alignment from "$components/ui/Alignment.svelte";
+
+describe("Alignment.svelte", () => {
+  it("should render with default left alignment", () => {
+    const { container } = render(Alignment, {
+      props: {
+        align: "left",
+      },
+    });
+
+    const buttons = container.querySelectorAll(".align-btn");
+    expect(buttons).toHaveLength(3);
+    expect(buttons[0]).toHaveClass("active");
+  });
+
+  it("should render with center alignment", () => {
+    const { container } = render(Alignment, {
+      props: {
+        align: "center",
+      },
+    });
+
+    const buttons = container.querySelectorAll(".align-btn");
+    expect(buttons[1]).toHaveClass("active");
+  });
+
+  it("should render with right alignment", () => {
+    const { container } = render(Alignment, {
+      props: {
+        align: "right",
+      },
+    });
+
+    const buttons = container.querySelectorAll(".align-btn");
+    expect(buttons[2]).toHaveClass("active");
+  });
+
+  it("should change alignment on button click", async () => {
+    const { container } = render(Alignment, {
+      props: {
+        align: "left",
+      },
+    });
+
+    const buttons = container.querySelectorAll(".align-btn");
+
+    await fireEvent.click(buttons[1]);
+    expect(buttons[1]).toHaveClass("active");
+    expect(buttons[0]).not.toHaveClass("active");
+
+    await fireEvent.click(buttons[2]);
+    expect(buttons[2]).toHaveClass("active");
+    expect(buttons[1]).not.toHaveClass("active");
+  });
+
+  it("should render all alignment buttons", () => {
+    const { container } = render(Alignment, {
+      props: {
+        align: "left",
+      },
+    });
+
+    const buttons = container.querySelectorAll(".align-btn");
+    expect(buttons).toHaveLength(3);
+  });
+});

tests/unit/components/ui/Badge.test.ts

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+import { render, screen } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
+import Badge from "$components/ui/Badge.svelte";
+
+describe("Badge.svelte", () => {
+  it("should render with string text", () => {
+    render(Badge, {
+      props: {
+        text: "Test Badge",
+      },
+    });
+
+    expect(screen.getByText("Test Badge")).toBeInTheDocument();
+  });
+
+  it("should render with number text", () => {
+    render(Badge, {
+      props: {
+        text: 42,
+      },
+    });
+
+    expect(screen.getByText("42")).toBeInTheDocument();
+  });
+
+  it("should render with empty string", () => {
+    const { container } = render(Badge, {
+      props: {
+        text: "",
+      },
+    });
+
+    const badge = container.querySelector(".badge");
+    expect(badge).toBeInTheDocument();
+    expect(badge).toHaveTextContent("");
+  });
+
+  it("should render with zero", () => {
+    render(Badge, {
+      props: {
+        text: 0,
+      },
+    });
+
+    expect(screen.getByText("0")).toBeInTheDocument();
+  });
+});

tests/unit/components/ui/Button.test.ts

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+import { render, screen, fireEvent } from "@testing-library/svelte";
+import { describe, expect, it, vi } from "vitest";
+import Button from "$components/ui/Button.svelte";
+import MockIcon from "./__mocks__/MockIcon.svelte";
+
+describe("Button.svelte", () => {
+
+  it("should render with icon and label", () => {
+    const { container } = render(Button, {
+      props: {
+        icon: MockIcon,
+        label: "Test Button",
+      },
+    });
+
+    expect(screen.getByText("Test Button")).toBeInTheDocument();
+    expect(container.querySelector("svg")).toBeInTheDocument();
+  });
+
+  it("should render with icon only", () => {
+    const { container } = render(Button, {
+      props: {
+        icon: MockIcon,
+      },
+    });
+
+    expect(container.querySelector("svg")).toBeInTheDocument();
+  });
+
+  it("should call onclick handler", async () => {
+    const onclick = vi.fn();
+    const { container } = render(Button, {
+      props: {
+        icon: MockIcon,
+        label: "Click me",
+        onclick,
+      },
+    });
+
+    const button = container.querySelector("button");
+    await fireEvent.click(button);
+
+    expect(onclick).toHaveBeenCalledTimes(1);
+  });
+
+  it("should be disabled when disabled prop is true", () => {
+    const { container } = render(Button, {
+      props: {
+        icon: MockIcon,
+        label: "Disabled",
+        disabled: true,
+      },
+    });
+
+    const button = container.querySelector("button");
+    expect(button).toBeDisabled();
+  });
+
+  it("should not be disabled by default", () => {
+    const { container } = render(Button, {
+      props: {
+        icon: MockIcon,
+        label: "Enabled",
+      },
+    });
+
+    const button = container.querySelector("button");
+    expect(button).not.toBeDisabled();
+  });
+
+  it("should render with different types", () => {
+    const types = ["primary", "secondary", "danger", "outline", "mini"] as const;
+
+    types.forEach(type => {
+      const { container, unmount } = render(Button, {
+        props: {
+          icon: MockIcon,
+          label: `${type} Button`,
+          type,
+        },
+      });
+
+      expect(screen.getByText(`${type} Button`)).toBeInTheDocument();
+      expect(container.querySelector("svg")).toBeInTheDocument();
+      unmount();
+    });
+  });
+});

tests/unit/components/ui/ColorPicker.test.ts

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+import { render, screen, fireEvent } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
+import ColorPicker from "$components/ui/ColorPicker.svelte";
+
+describe("ColorPicker.svelte", () => {
+  it("should render with initial value", () => {
+    const { container } = render(ColorPicker, {
+      props: {
+        value: "#ffffff",
+      },
+    });
+
+    const input = container.querySelector(".color-input");
+    expect(input).toBeInTheDocument();
+    expect(screen.getByText("#ffffff")).toBeInTheDocument();
+  });
+
+  it("should update value on change", async () => {
+    const { container } = render(ColorPicker, {
+      props: {
+        value: "#ffffff",
+      },
+    });
+
+    const input = container.querySelector(".color-input");
+    await fireEvent.input(input, { target: { value: "#ff0000" } });
+
+    expect(screen.getByText("#ff0000")).toBeInTheDocument();
+  });
+
+  it("should render with different color values", () => {
+    render(ColorPicker, {
+      props: {
+        value: "#000000",
+      },
+    });
+
+    expect(screen.getByText("#000000")).toBeInTheDocument();
+  });
+});

tests/unit/components/ui/RangeSlider.test.ts

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+import { render, screen, fireEvent } from "@testing-library/svelte";
+import { describe, expect, it, vi } from "vitest";
+import RangeSlider from "$components/ui/RangeSlider.svelte";
+
+describe("RangeSlider.svelte", () => {
+  it("should render with default props", () => {
+    const { container } = render(RangeSlider, {
+      props: {
+        value: 50,
+      },
+    });
+
+    const slider = container.querySelector(".slider");
+    expect(slider).toBeInTheDocument();
+    expect(screen.getByText("50")).toBeInTheDocument();
+  });
+
+  it("should render with custom min, max, step", () => {
+    const { container } = render(RangeSlider, {
+      props: {
+        value: 25,
+        min: 0,
+        max: 50,
+        step: 5,
+      },
+    });
+
+    const slider = container.querySelector(".slider");
+    expect(slider).toHaveAttribute("min", "0");
+    expect(slider).toHaveAttribute("max", "50");
+    expect(slider).toHaveAttribute("step", "5");
+  });
+
+  it("should update value on change", async () => {
+    const { container } = render(RangeSlider, {
+      props: {
+        value: 50,
+      },
+    });
+
+    const slider = container.querySelector(".slider");
+    await fireEvent.input(slider, { target: { value: "75" } });
+
+    expect(screen.getByText("75")).toBeInTheDocument();
+  });
+
+  it("should call onchange handler", async () => {
+    const onchange = vi.fn();
+    const { container } = render(RangeSlider, {
+      props: {
+        value: 50,
+        onchange,
+      },
+    });
+
+    const slider = container.querySelector(".slider");
+    await fireEvent.change(slider, { target: { value: "75" } });
+
+    expect(onchange).toHaveBeenCalled();
+  });
+});

tests/unit/components/ui/SelectFont.test.ts

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+import { render, screen, fireEvent } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
+import SelectFont from "$components/ui/SelectFont.svelte";
+
+describe("SelectFont.svelte", () => {
+  const fonts = [
+    "Arial",
+    "Verdana",
+    "Georgia",
+    "Times New Roman",
+    "Courier New",
+    "Impact",
+    "Comic Sans MS",
+    "Trebuchet MS",
+  ];
+
+  it("should render with initial value", () => {
+    const { container } = render(SelectFont, {
+      props: {
+        value: "Arial",
+      },
+    });
+
+    const select = container.querySelector(".select-input");
+    expect(select).toBeInTheDocument();
+    expect(select).toHaveValue("Arial");
+  });
+
+  it("should render all font options", () => {
+    render(SelectFont, {
+      props: {
+        value: "Arial",
+      },
+    });
+
+    fonts.forEach(font => {
+      const options = screen.queryAllByText(font);
+      expect(options.length).toBeGreaterThan(0);
+    });
+  });
+
+  it("should update value on change", async () => {
+    const { container } = render(SelectFont, {
+      props: {
+        value: "Arial",
+      },
+    });
+
+    const select = container.querySelector(".select-input");
+    await fireEvent.change(select, { target: { value: "Verdana" } });
+
+    expect(select).toHaveValue("Verdana");
+  });
+
+  it("should select different fonts", async () => {
+    const { container } = render(SelectFont, {
+      props: {
+        value: "Arial",
+      },
+    });
+
+    const select = container.querySelector(".select-input");
+
+    await fireEvent.change(select, { target: { value: "Georgia" } });
+    expect(select).toHaveValue("Georgia");
+
+    await fireEvent.change(select, { target: { value: "Impact" } });
+    expect(select).toHaveValue("Impact");
+  });
+});

tests/unit/components/ui/__mocks__/MockIcon.svelte

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+<svg data-testid="mock-icon" viewBox="0 0 24 24">
+  <circle cx="12" cy="12" r="10" />
+</svg>