diff --git a/eslint.config.js b/eslint.config.js
index 052448c..9627bf0 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -1,5 +1,6 @@
 import { includeIgnoreFile } from "@eslint/compat";
 import js from "@eslint/js";
+import vitest from "@vitest/eslint-plugin";
 import prettier from "eslint-config-prettier";
 import svelte from "eslint-plugin-svelte";
 import { defineConfig } from "eslint/config";
@@ -26,6 +27,14 @@ export default defineConfig(
       "no-undef": "off",
       "no-unused-vars": "off",
       "no-console": ["error", { allow: ["warn", "error"] }],
+      "@typescript-eslint/no-magic-numbers": [
+        "error",
+        {
+          enforceConst: true,
+          ignoreDefaultValues: true,
+          ignore: [0, 1, 2],
+        },
+      ],
       "@typescript-eslint/no-unused-vars": [
         "error",
         {
@@ -47,4 +56,45 @@ export default defineConfig(
       },
     },
   },
+  {
+    files: ["**/constants.ts", "**/constants/*.ts"],
+    rules: {
+      "no-magic-numbers": "off",
+      "@typescript-eslint/no-magic-numbers": "off",
+    },
+  },
+  {
+    files: ["**/constants.ts", "**/constants/*.ts"],
+    rules: {
+      "no-magic-numbers": "off",
+      "@typescript-eslint/no-magic-numbers": "off",
+    },
+  },
+  {
+    files: ["scripts/**"],
+    rules: {
+      "no-magic-numbers": "off",
+      "@typescript-eslint/no-magic-numbers": "off",
+      "no-console": "off",
+    },
+  },
+  {
+    files: ["**/*.test.ts", "**/*.spec.ts", "tests/**/*"],
+    plugins: { vitest },
+    rules: {
+      ...vitest.configs.recommended.rules,
+
+      "vitest/no-focused-tests": "error",
+      "vitest/no-disabled-tests": "warn",
+      "vitest/expect-expect": "error",
+      "vitest/no-conditional-expect": "error",
+      "vitest/require-hook": "warn",
+      "vitest/consistent-test-it": ["error", { fn: "it", withinDescribe: "it" }],
+      "vitest/require-top-level-describe": "error",
+      "vitest/no-identical-title": "error",
+
+      "no-magic-numbers": "off",
+      "@typescript-eslint/no-magic-numbers": "off",
+    },
+  },
 );
diff --git a/package-lock.json b/package-lock.json
index ee1a9e6..0daff94 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -31,6 +31,7 @@
         "@types/file-saver": "^2.0.7",
         "@types/node": "^20",
         "@vitest/coverage-istanbul": "^4.0.18",
+        "@vitest/eslint-plugin": "^1.6.9",
         "@vitest/ui": "^4.0.18",
         "eslint": "^9.39.2",
         "eslint-config-prettier": "^10.1.8",
@@ -2632,6 +2633,33 @@
         "vitest": "4.0.18"
       }
     },
+    "node_modules/@vitest/eslint-plugin": {
+      "version": "1.6.9",
+      "resolved": "https://registry.npmjs.org/@vitest/eslint-plugin/-/eslint-plugin-1.6.9.tgz",
+      "integrity": "sha512-9WfPx1OwJ19QLCSRLkqVO7//1WcWnK3fE/3fJhKMAmDe8+9G4rB47xCNIIeCq3FdEzkIoLTfDlwDlPBaUTMhow==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@typescript-eslint/scope-manager": "^8.55.0",
+        "@typescript-eslint/utils": "^8.55.0"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "peerDependencies": {
+        "eslint": ">=8.57.0",
+        "typescript": ">=5.0.0",
+        "vitest": "*"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        },
+        "vitest": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@vitest/expect": {
       "version": "4.0.18",
       "resolved": "https://registry.npmjs.org/@vitest/expect/-/expect-4.0.18.tgz",
diff --git a/package.json b/package.json
index b545312..0903ddd 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,7 @@
     "@types/file-saver": "^2.0.7",
     "@types/node": "^20",
     "@vitest/coverage-istanbul": "^4.0.18",
+    "@vitest/eslint-plugin": "^1.6.9",
     "@vitest/ui": "^4.0.18",
     "eslint": "^9.39.2",
     "eslint-config-prettier": "^10.1.8",
diff --git a/src/components/panel/Preview.svelte b/src/components/panel/Preview.svelte
index f3a3308..5584ef2 100644
--- a/src/components/panel/Preview.svelte
+++ b/src/components/panel/Preview.svelte
@@ -1,6 +1,6 @@
 <script lang="ts">
   import { PANEL_SETTINGS } from "$lib/constants";
-  import { imageConfigState } from "$states/imageConfig.svelte";
+  import { imageState } from "$states/image.svelte";
   import { textConfigState } from "$states/textConfig.svelte";
   import { Image, Layer, Stage, Text } from "svelte-konva";
 
@@ -12,14 +12,18 @@
   let { text, stage = $bindable() }: Props = $props();
 
   let x = $derived(textConfigState.paddingX);
-  let y = $derived(10 + textConfigState.offsetY);
+  let y = $derived(textConfigState.offsetY);
   let width = $derived(PANEL_SETTINGS.PANEL_WIDTH - 2 * textConfigState.paddingX);
   let height = PANEL_SETTINGS.PANEL_HEIGHT_DEFAULT;
 </script>
 
-<Stage width={320} height={100} bind:this={stage}>
+<Stage
+  width={PANEL_SETTINGS.PANEL_WIDTH}
+  height={PANEL_SETTINGS.PANEL_HEIGHT_DEFAULT}
+  bind:this={stage}
+>
   <Layer>
-    <Image image={imageConfigState.image}></Image>
+    <Image image={imageState.croppedImage}></Image>
     <Text
       {text}
       {x}
diff --git a/src/components/text/TextConfig.svelte b/src/components/text/TextConfig.svelte
index 5164f3d..1f03d98 100644
--- a/src/components/text/TextConfig.svelte
+++ b/src/components/text/TextConfig.svelte
@@ -6,13 +6,19 @@
   import ColorPicker from "$components/ui/ColorPicker.svelte";
   import RangeSlider from "$components/ui/RangeSlider.svelte";
   import SelectFont from "$components/ui/SelectFont.svelte";
+  import { TYPOGRAPHY } from "$lib/constants";
   import { textConfigState } from "$states/textConfig.svelte";
 </script>
 
 <Card title="Настройки текста">
   <SettingsGrid>
     <SettingsRow label="Размер">
-      <RangeSlider bind:value={textConfigState.fontSize} min={10} max={100} step={1} />
+      <RangeSlider
+        bind:value={textConfigState.fontSize}
+        min={TYPOGRAPHY.FONT_SIZE_MIN}
+        max={TYPOGRAPHY.FONT_SIZE_MAX}
+        step={1}
+      />
     </SettingsRow>
     <SettingsRow label="Шрифт">
       <SelectFont bind:value={textConfigState.fontFamily} />
@@ -24,10 +30,20 @@
       <Alignment bind:align={textConfigState.align} />
     </SettingsRow>
     <SettingsRow label="Отступы">
-      <RangeSlider bind:value={textConfigState.paddingX} min={0} max={100} step={1} />
+      <RangeSlider
+        bind:value={textConfigState.paddingX}
+        min={TYPOGRAPHY.PADDING_X_MIN}
+        max={TYPOGRAPHY.PADDING_X_MAX}
+        step={1}
+      />
     </SettingsRow>
     <SettingsRow label="Смещение">
-      <RangeSlider bind:value={textConfigState.offsetY} min={-100} max={100} step={1} />
+      <RangeSlider
+        bind:value={textConfigState.offsetY}
+        min={TYPOGRAPHY.VERTICAL_OFFSET_MIN}
+        max={TYPOGRAPHY.VERTICAL_OFFSET_MAX}
+        step={1}
+      />
     </SettingsRow>
   </SettingsGrid>
 </Card>
diff --git a/src/components/ui/ColorPicker.svelte b/src/components/ui/ColorPicker.svelte
index ad9e731..eb8b869 100644
--- a/src/components/ui/ColorPicker.svelte
+++ b/src/components/ui/ColorPicker.svelte
@@ -8,7 +8,7 @@
   let { value = $bindable() }: Props = $props();
 </script>
 
-<input type="color" bind:value class="color-input" />
+<input type="color" role="button" bind:value class="color-input" />
 <span class="color-value">{value}</span>
 
 <style>
diff --git a/src/states/persisted.svelte.ts b/src/states/persisted.svelte.ts
index 9165bc7..8d9a7e8 100644
--- a/src/states/persisted.svelte.ts
+++ b/src/states/persisted.svelte.ts
@@ -1,6 +1,7 @@
 import { browser } from "$app/environment";
 
 export const STATE_DATA = Symbol("state-data");
+// eslint-disable-next-line @typescript-eslint/no-magic-numbers
 export const DEBOUNCE_DURATION = import.meta.env.MODE === "test" ? 0 : 500;
 
 export interface Persistable<D> {
diff --git a/tests/unit/__snapshots__/constants.test.ts.snap b/tests/unit/__snapshots__/constants.test.ts.snap
index 24eabb9..13e500c 100644
--- a/tests/unit/__snapshots__/constants.test.ts.snap
+++ b/tests/unit/__snapshots__/constants.test.ts.snap
@@ -4,6 +4,13 @@ exports[`Application Constants Logic > Global Contract (Snapshot) > should match
 {
   "DEFAULT_TEXT_ALIGN": "center",
   "IMAGE_SETTINGS": {
+    "BRIGHTNESS_MAX": 100,
+    "BRIGHTNESS_MIN": 0,
+    "CONTRAST_MAX": 150,
+    "CONTRAST_MIN": 50,
+    "DEFAULT_BACKGROUND_IMAGE": "./backgrounds/b1.jpg",
+    "DEFAULT_BRIGHTNESS": 100,
+    "DEFAULT_CONTRAST": 100,
     "MAX_FILE_SIZE": 10485760,
     "SUPPORTED_FORMATS": [
       "image/jpeg",
@@ -14,7 +21,6 @@ exports[`Application Constants Logic > Global Contract (Snapshot) > should match
     ],
   },
   "PANEL_SETTINGS": {
-    "DEFAULT_BACKGROUND_IMAGE": "./backgrounds/b1.jpg",
     "PANEL_HEIGHT_DEFAULT": 100,
     "PANEL_HEIGHT_MAX": 200,
     "PANEL_WIDTH": 320,
@@ -42,6 +48,7 @@ exports[`Application Constants Logic > Global Contract (Snapshot) > should match
     "MAX_TEXT_LENGTH": 100,
     "PADDING_X_DEFAULT": 10,
     "PADDING_X_MAX": 100,
+    "PADDING_X_MIN": 0,
     "TEXT_COLOR_DEFAULT": "#ffffff",
     "VERTICAL_OFFSET_MAX": 100,
     "VERTICAL_OFFSET_MIN": -100,
diff --git a/tests/unit/components/image/ImageManager.test.ts b/tests/unit/components/image/ImageManager.test.ts
index bc3665b..dd7f68d 100644
--- a/tests/unit/components/image/ImageManager.test.ts
+++ b/tests/unit/components/image/ImageManager.test.ts
@@ -1,9 +1,11 @@
 import ImageManager from "$components/image/ImageManager.svelte";
 import { render } from "@testing-library/svelte";
-import { describe, it } from "vitest";
+import { describe, expect, it } from "vitest";
 
 describe("ImageManager.svelte", () => {
   it("should render without crashing", () => {
-    render(ImageManager);
+    const { container } = render(ImageManager);
+
+    expect(container).toBeTruthy();
   });
 });
diff --git a/tests/unit/components/panel/Preview.test.ts b/tests/unit/components/panel/Preview.test.ts
index 33aa2f1..3f8da7b 100644
--- a/tests/unit/components/panel/Preview.test.ts
+++ b/tests/unit/components/panel/Preview.test.ts
@@ -2,11 +2,11 @@ import Preview from "$components/panel/Preview.svelte";
 import { cleanup, render } from "@testing-library/svelte";
 import { afterEach, describe, expect, it } from "vitest";
 
-afterEach(() => {
-  cleanup();
-});
-
 describe("Preview.svelte", () => {
+  afterEach(() => {
+    cleanup();
+  });
+
   it("should render without crashing", () => {
     const { container } = render(Preview, {
       props: {
diff --git a/tests/unit/components/panel/PreviewAll.test.ts b/tests/unit/components/panel/PreviewAll.test.ts
index 5ed9ba6..d6ec499 100644
--- a/tests/unit/components/panel/PreviewAll.test.ts
+++ b/tests/unit/components/panel/PreviewAll.test.ts
@@ -1,14 +1,11 @@
 import PreviewAll from "$components/panel/PreviewAll.svelte";
-import { textsState } from "$states/texts.svelte";
 import { render } from "@testing-library/svelte";
-import { beforeEach, describe, it } from "vitest";
+import { describe, expect, it } from "vitest";
 
 describe("PreviewAll.svelte", () => {
-  beforeEach(() => {
-    textsState.texts.length = 0;
-  });
-
   it("should render without crashing", () => {
-    render(PreviewAll);
+    const { container } = render(PreviewAll);
+
+    expect(container).toBeTruthy();
   });
 });
diff --git a/tests/unit/components/text/TextConfig.test.ts b/tests/unit/components/text/TextConfig.test.ts
index 4c6c06a..0506b6a 100644
--- a/tests/unit/components/text/TextConfig.test.ts
+++ b/tests/unit/components/text/TextConfig.test.ts
@@ -1,13 +1,11 @@
 import TextConfig from "$components/text/TextConfig.svelte";
-import { cleanup, render } from "@testing-library/svelte";
-import { afterEach, describe, it } from "vitest";
-
-afterEach(() => {
-  cleanup();
-});
+import { render } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
 
 describe("TextConfig.svelte", () => {
   it("should render without crashing", () => {
-    render(TextConfig);
+    const { container } = render(TextConfig);
+
+    expect(container).toBeTruthy();
   });
 });
diff --git a/tests/unit/components/text/TextInlineEdit.test.ts b/tests/unit/components/text/TextInlineEdit.test.ts
index 1ea1daa..b5a3fcc 100644
--- a/tests/unit/components/text/TextInlineEdit.test.ts
+++ b/tests/unit/components/text/TextInlineEdit.test.ts
@@ -2,11 +2,11 @@ import TextInlineEdit from "$components/text/TextInlineEdit.svelte";
 import { cleanup, render, screen } from "@testing-library/svelte";
 import { afterEach, describe, expect, it } from "vitest";
 
-afterEach(() => {
-  cleanup();
-});
-
 describe("TextInlineEdit.svelte", () => {
+  afterEach(() => {
+    cleanup();
+  });
+
   it("should render with initial text", () => {
     render(TextInlineEdit, {
       props: {
diff --git a/tests/unit/components/ui/Badge.test.ts b/tests/unit/components/ui/Badge.test.ts
index a9e8fc4..b5b6cbd 100644
--- a/tests/unit/components/ui/Badge.test.ts
+++ b/tests/unit/components/ui/Badge.test.ts
@@ -24,11 +24,13 @@ describe("Badge.svelte", () => {
   });
 
   it("should render with empty string", () => {
-    render(Badge, {
+    const { container } = render(Badge, {
       props: {
         text: "",
       },
     });
+
+    expect(container.textContent?.trim()).toBe("");
   });
 
   it("should render with zero", () => {
diff --git a/tests/unit/components/ui/ColorPicker.test.ts b/tests/unit/components/ui/ColorPicker.test.ts
index 53c4e5f..5219943 100644
--- a/tests/unit/components/ui/ColorPicker.test.ts
+++ b/tests/unit/components/ui/ColorPicker.test.ts
@@ -1,6 +1,6 @@
 import ColorPicker from "$components/ui/ColorPicker.svelte";
-import { render } from "@testing-library/svelte";
-import { describe, it } from "vitest";
+import { render, screen } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
 
 describe("ColorPicker.svelte", () => {
   it("should render without crashing", () => {
@@ -9,5 +9,6 @@ describe("ColorPicker.svelte", () => {
         value: "#ffffff",
       },
     });
+    expect(screen.getByRole("button")).toBeInTheDocument();
   });
 });
diff --git a/tests/unit/components/ui/SelectFont.test.ts b/tests/unit/components/ui/SelectFont.test.ts
index 016d10e..a226200 100644
--- a/tests/unit/components/ui/SelectFont.test.ts
+++ b/tests/unit/components/ui/SelectFont.test.ts
@@ -1,6 +1,6 @@
 import SelectFont from "$components/ui/SelectFont.svelte";
-import { render } from "@testing-library/svelte";
-import { describe, it } from "vitest";
+import { render, screen } from "@testing-library/svelte";
+import { describe, expect, it } from "vitest";
 
 describe("SelectFont.svelte", () => {
   it("should render without crashing", () => {
@@ -9,5 +9,6 @@ describe("SelectFont.svelte", () => {
         value: "Arial",
       },
     });
+    expect(screen.getByRole("combobox")).toBeInTheDocument();
   });
 });
diff --git a/tests/unit/constants.test.ts b/tests/unit/constants.test.ts
index 9dd643b..33b777b 100644
--- a/tests/unit/constants.test.ts
+++ b/tests/unit/constants.test.ts
@@ -57,7 +57,7 @@ describe("Application Constants Logic", () => {
 
   describe("Assets Existence", () => {
     it("should verify that the default background image exists", () => {
-      const { DEFAULT_BACKGROUND_IMAGE } = Constants.PANEL_SETTINGS;
+      const { DEFAULT_BACKGROUND_IMAGE } = Constants.IMAGE_SETTINGS;
 
       const relativePath = DEFAULT_BACKGROUND_IMAGE.replace(/^\.\//, "");
       const fullPath = path.resolve(process.cwd(), "static", relativePath);
diff --git a/tests/unit/services/downloadService.test.ts b/tests/unit/services/downloadService.test.ts
index a457799..ff3fda0 100644
--- a/tests/unit/services/downloadService.test.ts
+++ b/tests/unit/services/downloadService.test.ts
@@ -2,7 +2,7 @@ import { DownloadService, type DownloadItem } from "$services/downloadService";
 import { saveAs } from "file-saver";
 import JSZip from "jszip";
 import type { Stage } from "konva/lib/Stage";
-import { beforeEach, describe, expect, it, vi } from "vitest";
+import { assert, beforeEach, describe, expect, it, vi } from "vitest";
 
 vi.mock("file-saver", () => {
   return {
@@ -58,10 +58,9 @@ describe("DownloadService", () => {
         "test-panel-1.png",
       );
 
-      expect(result.success).toBe(false);
-      if (!result.success) {
-        expect(result.error).toContain("Konva Stage не найден или не поддерживает toBlob");
-      }
+      assert(result.success === false);
+
+      expect(result.error).toContain("Konva Stage не найден или не поддерживает toBlob");
     });
 
     it("should handle blob creation failure", async () => {
@@ -71,10 +70,9 @@ describe("DownloadService", () => {
 
       const result = await service.downloadPanel(mockKonvaStage, "test-panel-1.png");
 
-      expect(result.success).toBe(false);
-      if (!result.success) {
-        expect(result.error).toContain("Не удалось создать изображение");
-      }
+      assert(result.success === false);
+
+      expect(result.error).toContain("Не удалось создать изображение");
     });
   });
 
@@ -122,10 +120,9 @@ describe("DownloadService", () => {
       ];
       const result = await service.downloadAll(panels);
 
-      expect(result.success).toBe(false);
-      if (!result.success) {
-        expect(result.error).toContain("Ошибка сохранения архива");
-      }
+      assert(result.success === false);
+
+      expect(result.error).toContain("Ошибка сохранения архива");
     });
   });
 });
diff --git a/tests/unit/states/imageConfig.test.ts b/tests/unit/states/imageConfig.test.ts
index 4dd0b99..7f2675c 100644
--- a/tests/unit/states/imageConfig.test.ts
+++ b/tests/unit/states/imageConfig.test.ts
@@ -1,5 +1,5 @@
 import { PANEL_SETTINGS } from "$lib/constants";
-import { imageConfigState, ImageConfigState } from "$states/imageConfig.svelte";
+import { imageState } from "$states/image.svelte";
 import { beforeEach, describe, expect, it, vi } from "vitest";
 
 type ImageEventHandler = ((this: HTMLImageElement, ev?: Event) => void) | null;
@@ -61,15 +61,15 @@ vi.stubGlobal(
   },
 );
 
-describe("ImageConfigState", () => {
+describe("imageState", () => {
   beforeEach(() => {
     lastOnload = null;
     lastOnerror = null;
-    imageConfigState.reset();
+    imageState.reset();
   });
 
   it("should create new instance with default values", () => {
-    const newState = new ImageConfigState();
+    const newState = new imageState();
     expect(newState.image).toBeUndefined();
     expect(newState.imageLink).toBe("");
     expect(newState.imageReady).toBe(false);
@@ -81,136 +81,136 @@ describe("ImageConfigState", () => {
   });
 
   it("should initialize with default background image", async () => {
-    await imageConfigState.uploadImageByLink(PANEL_SETTINGS.DEFAULT_BACKGROUND_IMAGE);
+    await imageState.uploadImageByLink(PANEL_SETTINGS.DEFAULT_BACKGROUND_IMAGE);
 
-    expect(imageConfigState.imageReady).toBe(true);
-    expect(imageConfigState.image).toBeDefined();
-    expect(imageConfigState.imageLink).toBe(PANEL_SETTINGS.DEFAULT_BACKGROUND_IMAGE);
+    expect(imageState.imageReady).toBe(true);
+    expect(imageState.image).toBeDefined();
+    expect(imageState.imageLink).toBe(PANEL_SETTINGS.DEFAULT_BACKGROUND_IMAGE);
   });
 
   it("should handle manual image upload correctly", async () => {
     const testLink = "https://example.com/test.png";
-    const uploadPromise = imageConfigState.uploadImageByLink(testLink);
+    const uploadPromise = imageState.uploadImageByLink(testLink);
 
-    expect(imageConfigState.imageReady).toBe(false);
+    expect(imageState.imageReady).toBe(false);
 
     await uploadPromise;
-    expect(imageConfigState.imageReady).toBe(true);
-    expect(imageConfigState.imageLink).toBe(testLink);
+    expect(imageState.imageReady).toBe(true);
+    expect(imageState.imageLink).toBe(testLink);
   });
 
   it("should reset state to defaults", async () => {
-    await imageConfigState.uploadImageByLink("some-image.png");
-    imageConfigState.cropLeft = 100;
+    await imageState.uploadImageByLink("some-image.png");
+    imageState.cropLeft = 100;
 
-    imageConfigState.reset();
+    imageState.reset();
 
-    expect(imageConfigState.imageReady).toBe(false);
-    expect(imageConfigState.imageLink).toBe("");
-    expect(imageConfigState.cropLeft).toBe(0);
-    expect(imageConfigState.image).toBeUndefined();
+    expect(imageState.imageReady).toBe(false);
+    expect(imageState.imageLink).toBe("");
+    expect(imageState.cropLeft).toBe(0);
+    expect(imageState.image).toBeUndefined();
   });
 
   it("should handle image loading error", async () => {
-    await expect(imageConfigState.uploadImageByLink("error-link")).rejects.toThrow(
+    await expect(imageState.uploadImageByLink("error-link")).rejects.toThrow(
       "Failed to load image",
     );
 
-    expect(imageConfigState.imageReady).toBe(false);
+    expect(imageState.imageReady).toBe(false);
   });
 
   it("should abort previous upload when new upload starts", async () => {
-    const upload1 = imageConfigState.uploadImageByLink("test1.jpg");
-    const upload2 = imageConfigState.uploadImageByLink("test2.jpg");
+    const upload1 = imageState.uploadImageByLink("test1.jpg");
+    const upload2 = imageState.uploadImageByLink("test2.jpg");
 
     await expect(upload1).rejects.toThrow("Aborted");
     await expect(upload2).resolves.toBeUndefined();
 
-    expect(imageConfigState.imageLink).toBe("test2.jpg");
+    expect(imageState.imageLink).toBe("test2.jpg");
   });
 
   it("should cleanup previous image before loading new one", async () => {
-    await imageConfigState.uploadImageByLink("test1.jpg");
-    const firstImage = imageConfigState.image;
+    await imageState.uploadImageByLink("test1.jpg");
+    const firstImage = imageState.image;
 
-    await imageConfigState.uploadImageByLink("test2.jpg");
+    await imageState.uploadImageByLink("test2.jpg");
 
     expect(firstImage?.onload).toBeNull();
     expect(firstImage?.onerror).toBeNull();
   });
 
   it("should set crop values", () => {
-    imageConfigState.cropLeft = 10;
-    imageConfigState.cropTop = 20;
-    imageConfigState.cropRight = 30;
-    imageConfigState.cropBottom = 40;
+    imageState.cropLeft = 10;
+    imageState.cropTop = 20;
+    imageState.cropRight = 30;
+    imageState.cropBottom = 40;
 
-    expect(imageConfigState.cropLeft).toBe(10);
-    expect(imageConfigState.cropTop).toBe(20);
-    expect(imageConfigState.cropRight).toBe(30);
-    expect(imageConfigState.cropBottom).toBe(40);
+    expect(imageState.cropLeft).toBe(10);
+    expect(imageState.cropTop).toBe(20);
+    expect(imageState.cropRight).toBe(30);
+    expect(imageState.cropBottom).toBe(40);
   });
 
   it("should cleanup image event handlers on reset", async () => {
-    await imageConfigState.uploadImageByLink("test.jpg");
-    const img = imageConfigState.image;
+    await imageState.uploadImageByLink("test.jpg");
+    const img = imageState.image;
 
-    imageConfigState.reset();
+    imageState.reset();
 
     expect(img?.onload).toBeNull();
     expect(img?.onerror).toBeNull();
   });
 
   it("should abort ongoing upload on reset", async () => {
-    const upload = imageConfigState.uploadImageByLink("test.jpg");
+    const upload = imageState.uploadImageByLink("test.jpg");
 
-    imageConfigState.reset();
+    imageState.reset();
 
     await expect(upload).rejects.toThrow("Aborted");
   });
 
   it("should cleanup resources on destroy", async () => {
-    await imageConfigState.uploadImageByLink("test.jpg");
-    const img = imageConfigState.image;
+    await imageState.uploadImageByLink("test.jpg");
+    const img = imageState.image;
 
-    imageConfigState.destroy();
+    imageState.destroy();
 
-    expect(imageConfigState.image).toBeUndefined();
+    expect(imageState.image).toBeUndefined();
     expect(img?.onload).toBeNull();
     expect(img?.onerror).toBeNull();
   });
 
   it("should abort ongoing upload on destroy", async () => {
-    const upload = imageConfigState.uploadImageByLink("test.jpg");
+    const upload = imageState.uploadImageByLink("test.jpg");
 
-    imageConfigState.destroy();
+    imageState.destroy();
 
     await expect(upload).rejects.toThrow("Aborted");
   });
 
   it("should cover aborted onload branch", async () => {
-    const promise = imageConfigState.uploadImageByLink("test.png");
+    const promise = imageState.uploadImageByLink("test.png");
 
-    imageConfigState.destroy();
+    imageState.destroy();
 
     if (lastOnload) {
       lastOnload.call(new Image() as HTMLImageElement, new Event("load"));
     }
 
     await expect(promise).rejects.toThrow();
-    expect(imageConfigState.imageReady).toBe(false);
+    expect(imageState.imageReady).toBe(false);
   });
 
   it("should cover aborted onerror branch", async () => {
-    const promise = imageConfigState.uploadImageByLink("test.png");
+    const promise = imageState.uploadImageByLink("test.png");
 
-    imageConfigState.destroy();
+    imageState.destroy();
 
     if (lastOnerror) {
       lastOnerror.call(new Image() as HTMLImageElement, new Event("load"));
     }
 
     await expect(promise).rejects.toThrow();
-    expect(imageConfigState.imageReady).toBe(false);
+    expect(imageState.imageReady).toBe(false);
   });
 });
diff --git a/tests/unit/states/persisted.svelte.test.ts b/tests/unit/states/persisted.svelte.test.ts
index 52a0d5f..aeb03ab 100644
--- a/tests/unit/states/persisted.svelte.test.ts
+++ b/tests/unit/states/persisted.svelte.test.ts
@@ -1,7 +1,7 @@
 import { STATE_DATA, withPersistence } from "$states/persisted.svelte";
-import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
 
-const localStorageMock = (() => {
+function createMock() {
   let store: Record<string, string> = {};
   return {
     getItem: vi.fn((key: string) => store[key] || null),
@@ -15,13 +15,20 @@ const localStorageMock = (() => {
       store = {};
     }),
   };
-})();
-
-Object.defineProperty(globalThis, "localStorage", {
-  value: localStorageMock,
-});
+}
 
 describe("persisted.svelte", () => {
+  let localStorageMock: ReturnType<typeof createMock>;
+
+  beforeAll(() => {
+    localStorageMock = createMock();
+    vi.stubGlobal("localStorage", localStorageMock);
+  });
+
+  afterAll(() => {
+    vi.unstubAllGlobals();
+  });
+
   beforeEach(() => {
     localStorageMock.clear();
     vi.clearAllMocks();
diff --git a/vitest.config.ts b/vitest.config.ts
index 25a5539..6cd0a2a 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -17,7 +17,7 @@ export default defineConfig({
     include: ["tests/**/*.{test,spec}.{js,ts}"],
     exclude: ["**/node_modules/**", "**/dist/**", "**/.svelte-kit/**", "**/build/**"],
     env: {
-      DEBUG_PRINT_LIMIT: "0",
+      DEBUG_PRINT_LIMIT: "2000",
     },
     coverage: {
       provider: "istanbul",