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test: add comprehensive Unicode emoji tests for apply_diff tool
- Add test suite for Unicode emoji handling in multi-search-replace strategy - Add specific reproduction tests for issue #6872 - Verify that checkmark (✔), warning (⚠️), cross (❌), and other emojis work correctly - Tests confirm Unicode characters are properly preserved during diff operations Fixes #6872
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‎src/core/diff/strategies/__tests__/issue-6872-reproduction.spec.ts‎

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import { MultiSearchReplaceDiffStrategy } from "../multi-search-replace"
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describe("Issue #6872 - apply_diff Tool Fails with Unicode Emoji Characters", () => {
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let strategy: MultiSearchReplaceDiffStrategy
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beforeEach(() => {
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strategy = new MultiSearchReplaceDiffStrategy(1.0) // Exact matching (100% threshold)
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})
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it("should handle the exact scenario from issue #6872", async () => {
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// This is the exact test case from the issue report
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const originalContent = `# Test File
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**✔ This is a test line.**
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Some other content.`
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const diffContent = `<<<<<<< SEARCH
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**✔ This is a test line.**
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=======
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**This line has been successfully modified.**
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>>>>>>> REPLACE`
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const result = await strategy.applyDiff(originalContent, diffContent)
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// The issue reports this should fail with 99% match, but we expect it to work
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe(`# Test File
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**This line has been successfully modified.**
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Some other content.`)
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}
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})
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it("should handle the exact scenario with start_line from issue #6872", async () => {
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const originalContent = `# Test File
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**✔ This is a test line.**
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Some other content.`
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const diffContent = `<<<<<<< SEARCH
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:start_line:3
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-------
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**✔ This is a test line.**
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=======
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**This line has been successfully modified.**
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>>>>>>> REPLACE`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe(`# Test File
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**This line has been successfully modified.**
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Some other content.`)
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}
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})
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it("should handle checkmark emoji with different normalization settings", async () => {
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// Test with 90% threshold to see if normalization affects matching
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const fuzzyStrategy = new MultiSearchReplaceDiffStrategy(0.9)
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const originalContent = `# Test File
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**✔ This is a test line.**
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Some other content.`
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const diffContent = `<<<<<<< SEARCH
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**✔ This is a test line.**
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=======
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**This line has been successfully modified.**
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>>>>>>> REPLACE`
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const result = await fuzzyStrategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe(`# Test File
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**This line has been successfully modified.**
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Some other content.`)
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}
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})
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it("should provide helpful error message if emoji causes mismatch", async () => {
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const originalContent = `# Test File
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**✔ This is a test line.**
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Some other content.`
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// Intentionally use a different emoji to test error handling
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const diffContent = `<<<<<<< SEARCH
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**✅ This is a test line.**
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=======
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**This line has been successfully modified.**
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>>>>>>> REPLACE`
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const result = await strategy.applyDiff(originalContent, diffContent)
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// This should fail because the emojis don't match
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expect(result.success).toBe(false)
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if (!result.success && result.error) {
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expect(result.error).toContain("No sufficiently similar match found")
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expect(result.error).toContain("100%") // Should mention the threshold
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}
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})
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})

‎src/core/diff/strategies/__tests__/unicode-emoji.spec.ts‎

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import { MultiSearchReplaceDiffStrategy } from "../multi-search-replace"
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describe("MultiSearchReplaceDiffStrategy - Unicode Emoji Handling", () => {
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let strategy: MultiSearchReplaceDiffStrategy
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beforeEach(() => {
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strategy = new MultiSearchReplaceDiffStrategy(1.0) // Exact matching
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})
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describe("Unicode emoji character handling", () => {
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it("should correctly match and replace content containing checkmark emoji (✔)", async () => {
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const originalContent = `# Test File
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**✔ This is a test line.**
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Some other content.`
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const diffContent = `<<<<<<< SEARCH
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**✔ This is a test line.**
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=======
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**This line has been successfully modified.**
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>>>>>>> REPLACE`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe(`# Test File
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**This line has been successfully modified.**
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Some other content.`)
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}
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})
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it("should handle multiple different emoji characters", async () => {
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const originalContent = `# Task List
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✅ Completed task
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⚠️ Warning task
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❌ Failed task
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🚀 Rocket task`
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const diffContent = `<<<<<<< SEARCH
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✅ Completed task
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⚠️ Warning task
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❌ Failed task
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🚀 Rocket task
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=======
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✅ Completed task
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⚠️ Warning task
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❌ Failed task
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🚀 Rocket task
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🎉 Celebration task
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>>>>>>> REPLACE`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe(`# Task List
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✅ Completed task
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⚠️ Warning task
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❌ Failed task
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🚀 Rocket task
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🎉 Celebration task`)
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}
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})
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it("should handle emoji in code comments", async () => {
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const originalContent = `function celebrate() {
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// 🎉 This function celebrates success
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console.log("Success!");
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}`
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const diffContent = `<<<<<<< SEARCH
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// 🎉 This function celebrates success
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=======
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// 🎉 This function celebrates success
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// 🚀 And launches rockets!
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>>>>>>> REPLACE`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe(`function celebrate() {
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// 🎉 This function celebrates success
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// 🚀 And launches rockets!
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console.log("Success!");
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}`)
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}
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})
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it("should handle mixed emoji and regular text", async () => {
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const originalContent = `## Status Report
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Current status: ✔ All systems operational
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Performance: 🚀 Blazing fast
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Issues: ❌ None found`
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const diffContent = `<<<<<<< SEARCH
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Current status: ✔ All systems operational
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Performance: 🚀 Blazing fast
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Issues: ❌ None found
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=======
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Current status: ✅ All systems operational
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Performance: 🚀 Blazing fast
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Issues: ⚠️ Minor warnings detected
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>>>>>>> REPLACE`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe(`## Status Report
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Current status: ✅ All systems operational
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Performance: 🚀 Blazing fast
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Issues: ⚠️ Minor warnings detected`)
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}
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})
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it("should handle emoji with line numbers", async () => {
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const originalContent = `# Test File
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**✔ This is a test line.**
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Some other content.`
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const diffContent = `<<<<<<< SEARCH
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:start_line:3
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-------
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**✔ This is a test line.**
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=======
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**✅ This line has been successfully modified.**
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>>>>>>> REPLACE`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe(`# Test File
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**✅ This line has been successfully modified.**
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Some other content.`)
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}
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})
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it("should handle complex Unicode characters beyond basic emoji", async () => {
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const originalContent = `# International Characters
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Chinese: 你好世界
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Japanese: こんにちは世界
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Korean: 안녕하세요
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Arabic: مرحبا بالعالم
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Hebrew: שלום עולם
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Emoji: 🌍🌎🌏`
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const diffContent = `<<<<<<< SEARCH
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Chinese: 你好世界
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Japanese: こんにちは世界
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Korean: 안녕하세요
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=======
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Chinese: 你好世界 (Hello World)
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Japanese: こんにちは世界 (Hello World)
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Korean: 안녕하세요 (Hello)
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>>>>>>> REPLACE`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe(`# International Characters
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Chinese: 你好世界 (Hello World)
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Japanese: こんにちは世界 (Hello World)
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Korean: 안녕하세요 (Hello)
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Arabic: مرحبا بالعالم
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Hebrew: שלום עולם
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Emoji: 🌍🌎🌏`)
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}
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})
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})
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})

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