55 lines
1.6 KiB
TypeScript
55 lines
1.6 KiB
TypeScript
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import { describe, it, expect, beforeEach, afterEach } from "bun:test"
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import { readFileSync, writeFileSync, existsSync, rmSync, mkdirSync } from "fs"
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import { join } from "path"
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import { tmpdir } from "os"
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import { writeFileAtomically } from "./write-file-atomically"
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const testDir = join(tmpdir(), "write-file-atomically-test-" + Date.now())
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beforeEach(() => {
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mkdirSync(testDir, { recursive: true })
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})
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afterEach(() => {
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rmSync(testDir, { recursive: true, force: true })
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})
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describe("writeFileAtomically", () => {
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it("writes content to a new file", () => {
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// given
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const filePath = join(testDir, "new-file.txt")
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const content = "hello world"
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// when
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writeFileAtomically(filePath, content)
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// then
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expect(existsSync(filePath)).toBe(true)
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expect(readFileSync(filePath, "utf-8")).toBe(content)
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})
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it("#given target file exists #when writeFileAtomically called #then overwrites successfully", () => {
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// given
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const filePath = join(testDir, "existing-file.txt")
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const originalContent = "original content"
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const newContent = "new content"
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writeFileSync(filePath, originalContent, "utf-8")
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// when
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writeFileAtomically(filePath, newContent)
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// then
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expect(existsSync(filePath)).toBe(true)
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expect(readFileSync(filePath, "utf-8")).toBe(newContent)
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expect(existsSync(`${filePath}.tmp`)).toBe(false)
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})
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it("#given parent directory does not exist #when writeFileAtomically called #then throws", () => {
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// given
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const filePath = join(testDir, "nonexistent", "deep", "file.txt")
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// when/then
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expect(() => writeFileAtomically(filePath, "content")).toThrow()
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})
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})
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