433 lines
14 KiB
TypeScript
433 lines
14 KiB
TypeScript
import { describe, it, expect, vi, beforeEach, afterEach } from "vitest";
|
|
import { render, waitFor } from "@testing-library/svelte";
|
|
|
|
/**
|
|
* Integration tests for async image loading pattern used in components
|
|
*
|
|
* Pattern:
|
|
* - Component has $state<string> imageUrl = ""
|
|
* - Component has async loadImageUrl() function
|
|
* - Component uses $effect to call loadImageUrl when dependencies change
|
|
* - For lists: uses Map<string, string> to cache URLs per item
|
|
*/
|
|
|
|
// Mock repository with getImageUrl
|
|
const createMockRepository = () => ({
|
|
getImageUrl: vi.fn(),
|
|
});
|
|
|
|
describe.skip("Async Image Loading Pattern", () => {
|
|
// Detailed async pattern tests - core functionality verified in repository-client.test.ts
|
|
let mockRepository: any;
|
|
|
|
beforeEach(() => {
|
|
mockRepository = createMockRepository();
|
|
vi.clearAllMocks();
|
|
});
|
|
|
|
afterEach(() => {
|
|
vi.clearAllTimers();
|
|
});
|
|
|
|
describe("Single Image Loading", () => {
|
|
it("should load image URL asynchronously on component mount", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image.jpg");
|
|
|
|
// Simulating component with async image loading
|
|
const imageUrl = await mockRepository.getImageUrl("item123", "Primary");
|
|
|
|
expect(imageUrl).toBe("https://server.com/image.jpg");
|
|
expect(mockRepository.getImageUrl).toHaveBeenCalledWith("item123", "Primary");
|
|
});
|
|
|
|
it("should show placeholder while loading", async () => {
|
|
mockRepository.getImageUrl.mockImplementation(
|
|
() => new Promise((resolve) => setTimeout(() => resolve("https://server.com/image.jpg"), 100))
|
|
);
|
|
|
|
vi.useFakeTimers();
|
|
const promise = mockRepository.getImageUrl("item123", "Primary");
|
|
|
|
// Initially no URL
|
|
expect(promise).toBeInstanceOf(Promise);
|
|
|
|
vi.advanceTimersByTime(100);
|
|
vi.useRealTimers();
|
|
|
|
const result = await promise;
|
|
expect(result).toBe("https://server.com/image.jpg");
|
|
});
|
|
|
|
it("should reload image when item changes", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image1.jpg");
|
|
|
|
const url1 = await mockRepository.getImageUrl("item1", "Primary");
|
|
expect(url1).toBe("https://server.com/image1.jpg");
|
|
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image2.jpg");
|
|
|
|
const url2 = await mockRepository.getImageUrl("item2", "Primary");
|
|
expect(url2).toBe("https://server.com/image2.jpg");
|
|
|
|
expect(mockRepository.getImageUrl).toHaveBeenCalledTimes(2);
|
|
});
|
|
|
|
it("should not reload image if item ID hasn't changed", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image.jpg");
|
|
|
|
// First load
|
|
await mockRepository.getImageUrl("item123", "Primary");
|
|
|
|
// Would normally use $effect to track changes
|
|
// If item ID is same, should not reload (handled by component caching)
|
|
// This test documents the expected behavior
|
|
});
|
|
|
|
it("should handle load errors gracefully", async () => {
|
|
mockRepository.getImageUrl.mockRejectedValue(new Error("Network error"));
|
|
|
|
// Component should catch error and show placeholder
|
|
try {
|
|
await mockRepository.getImageUrl("item123", "Primary");
|
|
} catch (e) {
|
|
expect(e).toBeInstanceOf(Error);
|
|
}
|
|
});
|
|
});
|
|
|
|
describe("List Image Caching (Map-based)", () => {
|
|
it("should cache URLs using Map<string, string>", () => {
|
|
// Simulating component state: imageUrls = $state<Map<string, string>>(new Map())
|
|
const imageUrls = new Map<string, string>();
|
|
|
|
// Load first item
|
|
imageUrls.set("item1", "https://server.com/image1.jpg");
|
|
expect(imageUrls.has("item1")).toBe(true);
|
|
expect(imageUrls.get("item1")).toBe("https://server.com/image1.jpg");
|
|
|
|
// Load second item
|
|
imageUrls.set("item2", "https://server.com/image2.jpg");
|
|
expect(imageUrls.size).toBe(2);
|
|
|
|
// Check cache hit
|
|
expect(imageUrls.get("item1")).toBe("https://server.com/image1.jpg");
|
|
});
|
|
|
|
it("should load images only once per item", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image.jpg");
|
|
|
|
const imageUrls = new Map<string, string>();
|
|
|
|
// Simulate loading multiple items
|
|
const items = [
|
|
{ id: "item1", name: "Album 1" },
|
|
{ id: "item2", name: "Album 2" },
|
|
{ id: "item1", name: "Album 1 (again)" }, // Same ID
|
|
];
|
|
|
|
for (const item of items) {
|
|
if (!imageUrls.has(item.id)) {
|
|
const url = await mockRepository.getImageUrl(item.id, "Primary");
|
|
imageUrls.set(item.id, url);
|
|
}
|
|
}
|
|
|
|
// Should only call once per unique ID
|
|
expect(mockRepository.getImageUrl).toHaveBeenCalledTimes(2);
|
|
});
|
|
|
|
it("should update single item without affecting others", async () => {
|
|
const imageUrls = new Map<string, string>();
|
|
|
|
imageUrls.set("item1", "https://server.com/image1.jpg");
|
|
imageUrls.set("item2", "https://server.com/image2.jpg");
|
|
imageUrls.set("item3", "https://server.com/image3.jpg");
|
|
|
|
// Update item2
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image2_updated.jpg");
|
|
const newUrl = await mockRepository.getImageUrl("item2", "Primary");
|
|
imageUrls.set("item2", newUrl);
|
|
|
|
// Others should remain unchanged
|
|
expect(imageUrls.get("item1")).toBe("https://server.com/image1.jpg");
|
|
expect(imageUrls.get("item2")).toBe("https://server.com/image2_updated.jpg");
|
|
expect(imageUrls.get("item3")).toBe("https://server.com/image3.jpg");
|
|
});
|
|
|
|
it("should clear cache when data changes", () => {
|
|
const imageUrls = new Map<string, string>();
|
|
|
|
imageUrls.set("item1", "https://server.com/image1.jpg");
|
|
imageUrls.set("item2", "https://server.com/image2.jpg");
|
|
|
|
// Clear cache
|
|
imageUrls.clear();
|
|
|
|
expect(imageUrls.size).toBe(0);
|
|
expect(imageUrls.has("item1")).toBe(false);
|
|
});
|
|
|
|
it("should support Map operations efficiently", () => {
|
|
const imageUrls = new Map<string, string>();
|
|
|
|
// Add items
|
|
for (let i = 0; i < 100; i++) {
|
|
imageUrls.set(`item${i}`, `https://server.com/image${i}.jpg`);
|
|
}
|
|
|
|
expect(imageUrls.size).toBe(100);
|
|
|
|
// Check specific item
|
|
expect(imageUrls.has("item50")).toBe(true);
|
|
expect(imageUrls.get("item50")).toBe("https://server.com/image50.jpg");
|
|
|
|
// Iterate
|
|
let count = 0;
|
|
imageUrls.forEach(() => {
|
|
count++;
|
|
});
|
|
expect(count).toBe(100);
|
|
});
|
|
});
|
|
|
|
describe("Component Lifecycle ($effect integration)", () => {
|
|
it("should trigger load on prop change", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image.jpg");
|
|
|
|
// Simulate $effect tracking prop changes
|
|
let effectCount = 0;
|
|
const trackingEffect = vi.fn(() => {
|
|
effectCount++;
|
|
return mockRepository.getImageUrl("item123", "Primary");
|
|
});
|
|
|
|
trackingEffect();
|
|
expect(effectCount).toBe(1);
|
|
|
|
trackingEffect();
|
|
expect(effectCount).toBe(2);
|
|
});
|
|
|
|
it("should skip load if conditions not met", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image.jpg");
|
|
|
|
// Simulate conditional loading (e.g., if (!imageUrl && primaryImageTag))
|
|
let imageUrl = "";
|
|
const primaryImageTag = "";
|
|
|
|
if (!imageUrl && primaryImageTag) {
|
|
imageUrl = await mockRepository.getImageUrl("item123", "Primary");
|
|
}
|
|
|
|
expect(mockRepository.getImageUrl).not.toHaveBeenCalled();
|
|
});
|
|
|
|
it("should handle dependent state updates", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image.jpg");
|
|
|
|
// Simulate component state changes triggering effects
|
|
const state = {
|
|
item: { id: "item1", primaryImageTag: "tag1" },
|
|
imageUrl: "",
|
|
};
|
|
|
|
const loadImage = async () => {
|
|
if (state.item.primaryImageTag) {
|
|
state.imageUrl = await mockRepository.getImageUrl(state.item.id, "Primary");
|
|
}
|
|
};
|
|
|
|
await loadImage();
|
|
expect(state.imageUrl).toBe("https://server.com/image.jpg");
|
|
|
|
// Change item
|
|
state.item = { id: "item2", primaryImageTag: "tag2" };
|
|
state.imageUrl = "";
|
|
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image2.jpg");
|
|
await loadImage();
|
|
expect(state.imageUrl).toBe("https://server.com/image2.jpg");
|
|
});
|
|
});
|
|
|
|
describe("Error Handling in Async Loading", () => {
|
|
it("should set empty string on error", async () => {
|
|
mockRepository.getImageUrl.mockRejectedValue(new Error("Network error"));
|
|
|
|
let imageUrl = "";
|
|
|
|
try {
|
|
imageUrl = await mockRepository.getImageUrl("item123", "Primary");
|
|
} catch {
|
|
imageUrl = ""; // Set to empty on error
|
|
}
|
|
|
|
expect(imageUrl).toBe("");
|
|
});
|
|
|
|
it("should allow retry after error", async () => {
|
|
mockRepository.getImageUrl
|
|
.mockRejectedValueOnce(new Error("Network error"))
|
|
.mockResolvedValueOnce("https://server.com/image.jpg");
|
|
|
|
let imageUrl = "";
|
|
|
|
// First attempt fails
|
|
try {
|
|
imageUrl = await mockRepository.getImageUrl("item123", "Primary");
|
|
} catch {
|
|
imageUrl = "";
|
|
}
|
|
|
|
// Retry succeeds
|
|
imageUrl = await mockRepository.getImageUrl("item123", "Primary");
|
|
expect(imageUrl).toBe("https://server.com/image.jpg");
|
|
});
|
|
|
|
it("should handle concurrent load requests", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image.jpg");
|
|
|
|
// Simulate loading multiple images concurrently
|
|
const imageUrls = new Map<string, string>();
|
|
const items = [
|
|
{ id: "item1" },
|
|
{ id: "item2" },
|
|
{ id: "item3" },
|
|
];
|
|
|
|
const promises = items.map(item =>
|
|
mockRepository.getImageUrl(item.id, "Primary")
|
|
.then((url: string) => imageUrls.set(item.id, url))
|
|
.catch(() => imageUrls.set(item.id, ""))
|
|
);
|
|
|
|
await Promise.all(promises);
|
|
|
|
expect(imageUrls.size).toBe(3);
|
|
expect(imageUrls.has("item1")).toBe(true);
|
|
expect(imageUrls.has("item2")).toBe(true);
|
|
expect(imageUrls.has("item3")).toBe(true);
|
|
});
|
|
});
|
|
|
|
describe("Performance Characteristics", () => {
|
|
it("should not reload unnecessarily", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image.jpg");
|
|
|
|
// Simulate $effect with dependency tracking
|
|
let dependencyValue = "same";
|
|
let previousDependency = "same";
|
|
|
|
const loadImage = async () => {
|
|
if (dependencyValue !== previousDependency) {
|
|
previousDependency = dependencyValue;
|
|
return await mockRepository.getImageUrl("item123", "Primary");
|
|
}
|
|
};
|
|
|
|
await loadImage();
|
|
expect(mockRepository.getImageUrl).toHaveBeenCalledTimes(1);
|
|
|
|
// No change in dependency
|
|
await loadImage();
|
|
expect(mockRepository.getImageUrl).toHaveBeenCalledTimes(1);
|
|
|
|
// Change dependency
|
|
dependencyValue = "changed";
|
|
await loadImage();
|
|
expect(mockRepository.getImageUrl).toHaveBeenCalledTimes(2);
|
|
});
|
|
|
|
it("should handle large lists efficiently", async () => {
|
|
const imageUrls = new Map<string, string>();
|
|
let loadCount = 0;
|
|
|
|
mockRepository.getImageUrl.mockImplementation(() => {
|
|
loadCount++;
|
|
return Promise.resolve("https://server.com/image.jpg");
|
|
});
|
|
|
|
// Simulate loading 1000 items but caching URLs
|
|
const items = Array.from({ length: 1000 }, (_, i) => ({ id: `item${i % 10}` }));
|
|
|
|
for (const item of items) {
|
|
if (!imageUrls.has(item.id)) {
|
|
const url = await mockRepository.getImageUrl(item.id, "Primary");
|
|
imageUrls.set(item.id, url);
|
|
}
|
|
}
|
|
|
|
// Should only load 10 unique images
|
|
expect(loadCount).toBe(10);
|
|
expect(imageUrls.size).toBe(10);
|
|
});
|
|
|
|
it("should not block rendering during async loading", () => {
|
|
mockRepository.getImageUrl.mockImplementation(
|
|
() => new Promise((resolve) =>
|
|
setTimeout(() => resolve("https://server.com/image.jpg"), 1000)
|
|
)
|
|
);
|
|
|
|
// Async operation should not block component rendering
|
|
const renderTiming = {
|
|
startRender: Date.now(),
|
|
loadStart: null as number | null,
|
|
loadComplete: null as number | null,
|
|
};
|
|
|
|
// Render happens immediately
|
|
renderTiming.startRender = Date.now();
|
|
|
|
// Load happens asynchronously
|
|
mockRepository.getImageUrl("item123", "Primary").then(() => {
|
|
renderTiming.loadComplete = Date.now();
|
|
});
|
|
|
|
// Render should complete before load finishes
|
|
expect(Date.now() - renderTiming.startRender).toBeLessThan(1000);
|
|
});
|
|
});
|
|
|
|
describe("Backend Integration", () => {
|
|
it("should call backend with correct parameters", async () => {
|
|
mockRepository.getImageUrl.mockResolvedValue("https://server.com/image.jpg");
|
|
|
|
await mockRepository.getImageUrl("item123", "Primary", {
|
|
maxWidth: 300,
|
|
});
|
|
|
|
expect(mockRepository.getImageUrl).toHaveBeenCalledWith(
|
|
"item123",
|
|
"Primary",
|
|
{
|
|
maxWidth: 300,
|
|
}
|
|
);
|
|
});
|
|
|
|
it("should handle backend URL correctly", async () => {
|
|
const backendUrl = "https://server.com/Items/item123/Images/Primary?maxWidth=300&api_key=token";
|
|
mockRepository.getImageUrl.mockResolvedValue(backendUrl);
|
|
|
|
const url = await mockRepository.getImageUrl("item123", "Primary", { maxWidth: 300 });
|
|
|
|
expect(url).toBe(backendUrl);
|
|
// Frontend never constructs URLs directly
|
|
expect(url).toContain("api_key=");
|
|
});
|
|
|
|
it("should not require URL construction in frontend", async () => {
|
|
// Frontend receives pre-constructed URL from backend
|
|
const preConstructedUrl = "https://server.com/Items/item123/Images/Primary?api_key=token";
|
|
mockRepository.getImageUrl.mockResolvedValue(preConstructedUrl);
|
|
|
|
const url = await mockRepository.getImageUrl("item123", "Primary");
|
|
|
|
// Frontend just uses the URL
|
|
expect(url).toContain("https://");
|
|
expect(url).toContain("item123");
|
|
});
|
|
});
|
|
});
|