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test: add unit tests for apply_diff error handling
- Add comprehensive unit test suite for MultiSearchReplaceDiffStrategy - Test all error scenarios: pattern not found, empty search, identical search/replace - Test fuzzy matching thresholds and line number hints - All 12 tests pass deterministically without AI involvement - Validates that apply_diff implementation handles errors correctly
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import { describe, it, expect } from "vitest"
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import { MultiSearchReplaceDiffStrategy } from "../multi-search-replace"
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describe("MultiSearchReplaceDiffStrategy - Error Handling", () => {
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describe("Pattern not found errors", () => {
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it("should return error when search pattern does not exist in file", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = "Original content"
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:1
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-------
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This content does not exist
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=======
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New content
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(false)
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if (!result.success) {
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// Result should have either error or failParts
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expect(result.error || result.failParts).toBeDefined()
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if (result.error) {
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expect(result.error).toContain("No sufficiently similar match found")
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} else if (result.failParts && result.failParts.length > 0) {
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const firstFail = result.failParts[0]
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if (firstFail && !firstFail.success && firstFail.error) {
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expect(firstFail.error).toContain("No sufficiently similar match found")
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}
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}
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}
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})
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it("should not modify file when search pattern is not found", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = "Original content that should not change"
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:1
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-------
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Non-existent pattern
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=======
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Replacement text
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(false)
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if (!result.success) {
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// When success is false, content is not present
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expect(result.error || result.failParts).toBeDefined()
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}
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// Original content should remain unchanged (not modified by the function)
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})
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it("should handle multiple blocks where some fail", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = `Line 1
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Line 2
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Line 3`
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:1
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-------
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Line 1
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=======
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Modified Line 1
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>>>>>>> REPLACE
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<<<<<<< SEARCH
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:start_line:2
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-------
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Non-existent line
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=======
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This should fail
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>>>>>>> REPLACE
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<<<<<<< SEARCH
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:start_line:3
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-------
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Line 3
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=======
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Modified Line 3
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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// Should succeed partially
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.failParts).toBeDefined()
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expect(result.failParts?.length).toBe(1)
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expect(result.failParts?.[0].success).toBe(false)
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// Content should have the successful replacements
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expect(result.content).toContain("Modified Line 1")
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expect(result.content).toContain("Modified Line 3")
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expect(result.content).not.toContain("This should fail")
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}
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})
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it("should return detailed error message with context", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = "Actual file content here"
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:1
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-------
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Wrong content
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=======
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Replacement
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(false)
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if (!result.success) {
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expect(result.error || result.failParts).toBeDefined()
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// Error should include helpful debugging information
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if (result.error) {
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expect(result.error).toContain("Search Content:")
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expect(result.error).toContain("Original Content:")
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} else if (result.failParts && result.failParts.length > 0) {
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const firstFail = result.failParts[0]
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if (firstFail && !firstFail.success && firstFail.error) {
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expect(firstFail.error).toContain("Search Content:")
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expect(firstFail.error).toContain("Original Content:")
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}
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}
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}
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})
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})
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describe("Empty search pattern errors", () => {
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it("should reject empty search content", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = "Some content"
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:1
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-------
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=======
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Replacement
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(false)
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if (!result.success) {
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expect(result.error || result.failParts).toBeDefined()
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if (result.error) {
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expect(result.error).toContain("Empty search content")
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} else if (result.failParts && result.failParts.length > 0) {
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const firstFail = result.failParts[0]
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if (firstFail && !firstFail.success && firstFail.error) {
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expect(firstFail.error).toContain("Empty search content")
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}
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}
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}
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})
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})
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describe("Identical search and replace", () => {
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it("should reject when search and replace are identical", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = "Same content"
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:1
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-------
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Same content
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=======
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Same content
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(false)
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if (!result.success) {
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expect(result.error || result.failParts).toBeDefined()
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if (result.error) {
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expect(result.error).toContain("identical")
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} else if (result.failParts && result.failParts.length > 0) {
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const firstFail = result.failParts[0]
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if (firstFail && !firstFail.success && firstFail.error) {
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expect(firstFail.error).toContain("identical")
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}
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}
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}
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})
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})
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describe("Invalid diff format errors", () => {
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it("should reject malformed diff blocks", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = "Content"
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const diffContent = `
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<<<<<<< SEARCH
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Missing separator
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(false)
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if (!result.success) {
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expect(result.error || result.failParts).toBeDefined()
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}
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})
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it("should reject diff with missing REPLACE marker", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = "Content"
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:1
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-------
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Content
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=======
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Replacement
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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expect(result.success).toBe(false)
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if (!result.success) {
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expect(result.error || result.failParts).toBeDefined()
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if (result.error) {
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expect(result.error).toContain("Expected '>>>>>>> REPLACE'")
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}
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}
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})
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})
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describe("Fuzzy matching threshold", () => {
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it("should respect fuzzy threshold when pattern is similar but not exact", async () => {
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// Use exact matching (threshold 1.0)
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const strategy = new MultiSearchReplaceDiffStrategy(1.0)
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const originalContent = "Hello World"
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:1
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-------
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Hello Wrold
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=======
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Goodbye World
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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// Should fail with exact matching due to typo
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expect(result.success).toBe(false)
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})
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it("should succeed with lower fuzzy threshold for similar patterns", async () => {
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// Use fuzzy matching (threshold 0.8 = 80% similarity)
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const strategy = new MultiSearchReplaceDiffStrategy(0.8)
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const originalContent = "Hello World"
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:1
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-------
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Hello Wrold
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=======
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Goodbye World
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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// Should succeed with fuzzy matching
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expect(result.success).toBe(true)
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if (result.success) {
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expect(result.content).toBe("Goodbye World")
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}
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})
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})
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describe("Line number hints", () => {
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it("should use line number hint to narrow search", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = `Line 1
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Duplicate
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Line 3
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Duplicate
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Line 5`
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:4
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-------
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Duplicate
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=======
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Modified
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>>>>>>> REPLACE
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`
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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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// Should replace the second occurrence (line 4)
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expect(result.content).toContain("Line 3\nModified\nLine 5")
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}
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})
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it("should return error when line number hint points to wrong location", async () => {
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const strategy = new MultiSearchReplaceDiffStrategy()
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const originalContent = `Line 1
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Line 2
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Line 3`
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const diffContent = `
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<<<<<<< SEARCH
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:start_line:10
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-------
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Line 1
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=======
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Modified
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>>>>>>> REPLACE
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`
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const result = await strategy.applyDiff(originalContent, diffContent)
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// Should still try to find the pattern but may fail or succeed depending on buffer
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expect(result).toBeDefined()
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})
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})
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})
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