72 lines
2.1 KiB
TypeScript
72 lines
2.1 KiB
TypeScript
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/// <reference types="bun-types" />
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import { describe, expect, it } from "bun:test"
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import { generateUnifiedDiff } from "./diff-utils"
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function createNumberedLines(totalLineCount: number): string {
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return Array.from({ length: totalLineCount }, (_, index) => `line ${index + 1}`).join("\n")
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}
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describe("generateUnifiedDiff", () => {
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it("creates separate hunks for distant changes", () => {
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//#given
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const oldContent = createNumberedLines(60)
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const newLines = oldContent.split("\n")
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newLines[4] = "line 5 updated"
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newLines[49] = "line 50 updated"
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const newContent = newLines.join("\n")
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//#when
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const diff = generateUnifiedDiff(oldContent, newContent, "sample.txt")
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//#then
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const hunkHeaders = diff.match(/^@@/gm) ?? []
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expect(hunkHeaders.length).toBe(2)
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})
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it("creates a single hunk for adjacent changes", () => {
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//#given
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const oldContent = createNumberedLines(20)
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const newLines = oldContent.split("\n")
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newLines[9] = "line 10 updated"
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newLines[10] = "line 11 updated"
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const newContent = newLines.join("\n")
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//#when
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const diff = generateUnifiedDiff(oldContent, newContent, "sample.txt")
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//#then
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const hunkHeaders = diff.match(/^@@/gm) ?? []
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expect(hunkHeaders.length).toBe(1)
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expect(diff).toContain(" line 8")
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expect(diff).toContain(" line 13")
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})
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it("returns a diff string for identical content", () => {
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//#given
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const oldContent = "alpha\nbeta\ngamma"
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const newContent = "alpha\nbeta\ngamma"
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//#when
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const diff = generateUnifiedDiff(oldContent, newContent, "sample.txt")
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//#then
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expect(typeof diff).toBe("string")
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expect(diff).toContain("--- sample.txt")
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expect(diff).toContain("+++ sample.txt")
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})
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it("returns a valid diff when old content is empty", () => {
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//#given
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const oldContent = ""
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const newContent = "first line\nsecond line"
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//#when
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const diff = generateUnifiedDiff(oldContent, newContent, "sample.txt")
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//#then
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expect(diff).toContain("--- sample.txt")
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expect(diff).toContain("+++ sample.txt")
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expect(diff).toContain("+first line")
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})
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})
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