add js-fp3.tests
This commit is contained in:
Oli Sturm
@@ -0,0 +1,143 @@
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# Logs
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logs
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*.log
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report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
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# Directory for instrumented libs generated by jscoverage/JSCover
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lib-cov
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coverage
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*.lcov
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# nyc test coverage
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.nyc_output
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bower_components
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build/Release
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# Firebase cache directory
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.firebase/
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||||
# TernJS port file
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.tern-port
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# Stores VSCode versions used for testing VSCode extensions
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.vscode-test
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# pnpm
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.pnpm-store
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# yarn v3
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.pnp.*
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.yarn/*
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!.yarn/patches
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!.yarn/plugins
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!.yarn/releases
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!.yarn/sdks
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!.yarn/versions
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# Vite files
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vite.config.js.timestamp-*
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vite.config.ts.timestamp-*
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.vite/
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@@ -0,0 +1,54 @@
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import { describe, it, expect } from 'vitest';
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import { openAccount, withdraw } from '../js-fp3/domain/account.js';
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import { createMoney } from '../js-fp3/domain/money.js';
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describe('account domain', () => {
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it('opening an account with a negative balance returns openingBalanceMustBeNonNegative', () => {
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const result = openAccount('id-1', createMoney(-1));
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expect(result.error.type).toBe('OpeningBalanceMustBeNonNegative');
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});
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it('withdrawing a zero amount returns amountMustBePositive', () => {
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const account = openAccount('id-1', createMoney(100)).value;
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const result = withdraw(account, createMoney(0));
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expect(result.error.type).toBe('AmountMustBePositive');
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});
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it('withdrawing a negative amount returns amountMustBePositive', () => {
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const account = openAccount('id-1', createMoney(100)).value;
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const result = withdraw(account, createMoney(-10));
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expect(result.error.type).toBe('AmountMustBePositive');
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});
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it('withdrawing more than the balance returns insufficientBalance', () => {
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const account = openAccount('id-1', createMoney(100)).value;
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const result = withdraw(account, createMoney(101));
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expect(result.error.type).toBe('InsufficientBalance');
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});
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it('insufficientBalance error reports the current balance and attempted amount', () => {
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const account = openAccount('id-1', createMoney(100)).value;
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const error = withdraw(account, createMoney(150)).error;
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expect(error.type).toBe('InsufficientBalance');
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expect(error.balance.amount).toBe(100);
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expect(error.amount.amount).toBe(150);
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});
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it('successive withdrawals are each applied to the running balance', () => {
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const account = openAccount('id-1', createMoney(300)).value;
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const updatedAccount1 = withdraw(account, createMoney(100)).value;
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const updatedAccount2 = withdraw(updatedAccount1, createMoney(100)).value;
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expect(updatedAccount2.balance.amount).toBe(100);
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});
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});
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Generated
+610
@@ -0,0 +1,610 @@
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{
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"name": "js-fp3-tests",
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"version": "1.0.0",
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||||
},
|
||||
{
|
||||
"type": "tidelift",
|
||||
"url": "https://tidelift.com/funding/github/npm/postcss"
|
||||
},
|
||||
{
|
||||
"type": "github",
|
||||
"url": "https://github.com/sponsors/ai"
|
||||
}
|
||||
],
|
||||
"license": "MIT",
|
||||
"dependencies": {
|
||||
"nanoid": "^3.3.11",
|
||||
"picocolors": "^1.1.1",
|
||||
"source-map-js": "^1.2.1"
|
||||
},
|
||||
"engines": {
|
||||
"node": "^10 || ^12 || >=14"
|
||||
}
|
||||
},
|
||||
"node_modules/rollup": {
|
||||
"version": "4.60.2",
|
||||
"dev": true,
|
||||
"license": "MIT",
|
||||
"dependencies": {
|
||||
"@types/estree": "1.0.8"
|
||||
},
|
||||
"bin": {
|
||||
"rollup": "dist/bin/rollup"
|
||||
},
|
||||
"engines": {
|
||||
"node": ">=18.0.0",
|
||||
"npm": ">=8.0.0"
|
||||
},
|
||||
"optionalDependencies": {
|
||||
"@rollup/rollup-android-arm-eabi": "4.60.2",
|
||||
"@rollup/rollup-android-arm64": "4.60.2",
|
||||
"@rollup/rollup-darwin-arm64": "4.60.2",
|
||||
"@rollup/rollup-darwin-x64": "4.60.2",
|
||||
"@rollup/rollup-freebsd-arm64": "4.60.2",
|
||||
"@rollup/rollup-freebsd-x64": "4.60.2",
|
||||
"@rollup/rollup-linux-arm-gnueabihf": "4.60.2",
|
||||
"@rollup/rollup-linux-arm-musleabihf": "4.60.2",
|
||||
"@rollup/rollup-linux-arm64-gnu": "4.60.2",
|
||||
"@rollup/rollup-linux-arm64-musl": "4.60.2",
|
||||
"@rollup/rollup-linux-loong64-gnu": "4.60.2",
|
||||
"@rollup/rollup-linux-loong64-musl": "4.60.2",
|
||||
"@rollup/rollup-linux-ppc64-gnu": "4.60.2",
|
||||
"@rollup/rollup-linux-ppc64-musl": "4.60.2",
|
||||
"@rollup/rollup-linux-riscv64-gnu": "4.60.2",
|
||||
"@rollup/rollup-linux-riscv64-musl": "4.60.2",
|
||||
"@rollup/rollup-linux-s390x-gnu": "4.60.2",
|
||||
"@rollup/rollup-linux-x64-gnu": "4.60.2",
|
||||
"@rollup/rollup-linux-x64-musl": "4.60.2",
|
||||
"@rollup/rollup-openbsd-x64": "4.60.2",
|
||||
"@rollup/rollup-openharmony-arm64": "4.60.2",
|
||||
"@rollup/rollup-win32-arm64-msvc": "4.60.2",
|
||||
"@rollup/rollup-win32-ia32-msvc": "4.60.2",
|
||||
"@rollup/rollup-win32-x64-gnu": "4.60.2",
|
||||
"@rollup/rollup-win32-x64-msvc": "4.60.2",
|
||||
"fsevents": "~2.3.2"
|
||||
}
|
||||
},
|
||||
"node_modules/siginfo": {
|
||||
"version": "2.0.0",
|
||||
"dev": true,
|
||||
"license": "ISC"
|
||||
},
|
||||
"node_modules/source-map-js": {
|
||||
"version": "1.2.1",
|
||||
"dev": true,
|
||||
"license": "BSD-3-Clause",
|
||||
"engines": {
|
||||
"node": ">=0.10.0"
|
||||
}
|
||||
},
|
||||
"node_modules/stackback": {
|
||||
"version": "0.0.2",
|
||||
"dev": true,
|
||||
"license": "MIT"
|
||||
},
|
||||
"node_modules/std-env": {
|
||||
"version": "3.10.0",
|
||||
"dev": true,
|
||||
"license": "MIT"
|
||||
},
|
||||
"node_modules/tinybench": {
|
||||
"version": "2.9.0",
|
||||
"dev": true,
|
||||
"license": "MIT"
|
||||
},
|
||||
"node_modules/tinyexec": {
|
||||
"version": "0.3.2",
|
||||
"dev": true,
|
||||
"license": "MIT"
|
||||
},
|
||||
"node_modules/tinypool": {
|
||||
"version": "1.1.1",
|
||||
"dev": true,
|
||||
"license": "MIT",
|
||||
"engines": {
|
||||
"node": "^18.0.0 || >=20.0.0"
|
||||
}
|
||||
},
|
||||
"node_modules/tinyrainbow": {
|
||||
"version": "1.2.0",
|
||||
"dev": true,
|
||||
"license": "MIT",
|
||||
"engines": {
|
||||
"node": ">=14.0.0"
|
||||
}
|
||||
},
|
||||
"node_modules/tinyspy": {
|
||||
"version": "3.0.2",
|
||||
"dev": true,
|
||||
"license": "MIT",
|
||||
"engines": {
|
||||
"node": ">=14.0.0"
|
||||
}
|
||||
},
|
||||
"node_modules/vite": {
|
||||
"version": "5.4.21",
|
||||
"dev": true,
|
||||
"license": "MIT",
|
||||
"dependencies": {
|
||||
"esbuild": "^0.21.3",
|
||||
"postcss": "^8.4.43",
|
||||
"rollup": "^4.20.0"
|
||||
},
|
||||
"bin": {
|
||||
"vite": "bin/vite.js"
|
||||
},
|
||||
"engines": {
|
||||
"node": "^18.0.0 || >=20.0.0"
|
||||
},
|
||||
"funding": {
|
||||
"url": "https://github.com/vitejs/vite?sponsor=1"
|
||||
},
|
||||
"optionalDependencies": {
|
||||
"fsevents": "~2.3.3"
|
||||
},
|
||||
"peerDependencies": {
|
||||
"@types/node": "^18.0.0 || >=20.0.0",
|
||||
"less": "*",
|
||||
"lightningcss": "^1.21.0",
|
||||
"sass": "*",
|
||||
"sass-embedded": "*",
|
||||
"stylus": "*",
|
||||
"sugarss": "*",
|
||||
"terser": "^5.4.0"
|
||||
},
|
||||
"peerDependenciesMeta": {
|
||||
"@types/node": {
|
||||
"optional": true
|
||||
},
|
||||
"less": {
|
||||
"optional": true
|
||||
},
|
||||
"lightningcss": {
|
||||
"optional": true
|
||||
},
|
||||
"sass": {
|
||||
"optional": true
|
||||
},
|
||||
"sass-embedded": {
|
||||
"optional": true
|
||||
},
|
||||
"stylus": {
|
||||
"optional": true
|
||||
},
|
||||
"sugarss": {
|
||||
"optional": true
|
||||
},
|
||||
"terser": {
|
||||
"optional": true
|
||||
}
|
||||
}
|
||||
},
|
||||
"node_modules/vite-node": {
|
||||
"version": "2.1.9",
|
||||
"dev": true,
|
||||
"license": "MIT",
|
||||
"dependencies": {
|
||||
"cac": "^6.7.14",
|
||||
"debug": "^4.3.7",
|
||||
"es-module-lexer": "^1.5.4",
|
||||
"pathe": "^1.1.2",
|
||||
"vite": "^5.0.0"
|
||||
},
|
||||
"bin": {
|
||||
"vite-node": "vite-node.mjs"
|
||||
},
|
||||
"engines": {
|
||||
"node": "^18.0.0 || >=20.0.0"
|
||||
},
|
||||
"funding": {
|
||||
"url": "https://opencollective.com/vitest"
|
||||
}
|
||||
},
|
||||
"node_modules/vitest": {
|
||||
"version": "2.1.9",
|
||||
"dev": true,
|
||||
"license": "MIT",
|
||||
"dependencies": {
|
||||
"@vitest/expect": "2.1.9",
|
||||
"@vitest/mocker": "2.1.9",
|
||||
"@vitest/pretty-format": "^2.1.9",
|
||||
"@vitest/runner": "2.1.9",
|
||||
"@vitest/snapshot": "2.1.9",
|
||||
"@vitest/spy": "2.1.9",
|
||||
"@vitest/utils": "2.1.9",
|
||||
"chai": "^5.1.2",
|
||||
"debug": "^4.3.7",
|
||||
"expect-type": "^1.1.0",
|
||||
"magic-string": "^0.30.12",
|
||||
"pathe": "^1.1.2",
|
||||
"std-env": "^3.8.0",
|
||||
"tinybench": "^2.9.0",
|
||||
"tinyexec": "^0.3.1",
|
||||
"tinypool": "^1.0.1",
|
||||
"tinyrainbow": "^1.2.0",
|
||||
"vite": "^5.0.0",
|
||||
"vite-node": "2.1.9",
|
||||
"why-is-node-running": "^2.3.0"
|
||||
},
|
||||
"bin": {
|
||||
"vitest": "vitest.mjs"
|
||||
},
|
||||
"engines": {
|
||||
"node": "^18.0.0 || >=20.0.0"
|
||||
},
|
||||
"funding": {
|
||||
"url": "https://opencollective.com/vitest"
|
||||
},
|
||||
"peerDependencies": {
|
||||
"@edge-runtime/vm": "*",
|
||||
"@types/node": "^18.0.0 || >=20.0.0",
|
||||
"@vitest/browser": "2.1.9",
|
||||
"@vitest/ui": "2.1.9",
|
||||
"happy-dom": "*",
|
||||
"jsdom": "*"
|
||||
},
|
||||
"peerDependenciesMeta": {
|
||||
"@edge-runtime/vm": {
|
||||
"optional": true
|
||||
},
|
||||
"@types/node": {
|
||||
"optional": true
|
||||
},
|
||||
"@vitest/browser": {
|
||||
"optional": true
|
||||
},
|
||||
"@vitest/ui": {
|
||||
"optional": true
|
||||
},
|
||||
"happy-dom": {
|
||||
"optional": true
|
||||
},
|
||||
"jsdom": {
|
||||
"optional": true
|
||||
}
|
||||
}
|
||||
},
|
||||
"node_modules/why-is-node-running": {
|
||||
"version": "2.3.0",
|
||||
"dev": true,
|
||||
"license": "MIT",
|
||||
"dependencies": {
|
||||
"siginfo": "^2.0.0",
|
||||
"stackback": "0.0.2"
|
||||
},
|
||||
"bin": {
|
||||
"why-is-node-running": "cli.js"
|
||||
},
|
||||
"engines": {
|
||||
"node": ">=8"
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,13 @@
|
||||
{
|
||||
"name": "js-fp3-tests",
|
||||
"version": "1.0.0",
|
||||
"description": "Vitest tests for js-fp3",
|
||||
"type": "module",
|
||||
"scripts": {
|
||||
"test": "vitest run",
|
||||
"test:watch": "vitest"
|
||||
},
|
||||
"devDependencies": {
|
||||
"vitest": "^2.0.0"
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,82 @@
|
||||
import { describe, it, expect, vi } from 'vitest';
|
||||
import { match, when, any } from '../js-fp3/library/patterns.js';
|
||||
|
||||
describe('when', () => {
|
||||
it('returns a two-element tuple of [predicate, handler]', () => {
|
||||
const predicate = () => true;
|
||||
const handler = () => 'result';
|
||||
|
||||
const branch = when(predicate, handler);
|
||||
|
||||
expect(branch).toEqual([predicate, handler]);
|
||||
});
|
||||
});
|
||||
|
||||
describe('any', () => {
|
||||
it('returns true for any value', () => {
|
||||
expect(any(0)).toBe(true);
|
||||
expect(any(null)).toBe(true);
|
||||
expect(any('string')).toBe(true);
|
||||
expect(any({ x: 1 })).toBe(true);
|
||||
});
|
||||
});
|
||||
|
||||
describe('match', () => {
|
||||
it('executes the handler of the first matching branch', () => {
|
||||
const result = match(
|
||||
when((v) => v === 1, () => 'one'),
|
||||
when((v) => v === 2, () => 'two'),
|
||||
when(any, () => 'other')
|
||||
)(1);
|
||||
|
||||
expect(result).toBe('one');
|
||||
});
|
||||
|
||||
it('falls through to the next branch when the first does not match', () => {
|
||||
const result = match(
|
||||
when((v) => v === 1, () => 'one'),
|
||||
when((v) => v === 2, () => 'two'),
|
||||
when(any, () => 'other')
|
||||
)(2);
|
||||
|
||||
expect(result).toBe('two');
|
||||
});
|
||||
|
||||
it('uses the any catch-all when no earlier branch matches', () => {
|
||||
const result = match(
|
||||
when((v) => v === 1, () => 'one'),
|
||||
when(any, () => 'catch-all')
|
||||
)(99);
|
||||
|
||||
expect(result).toBe('catch-all');
|
||||
});
|
||||
|
||||
it('passes the value to the handler', () => {
|
||||
const result = match(
|
||||
when(any, (v) => v * 2)
|
||||
)(7);
|
||||
|
||||
expect(result).toBe(14);
|
||||
});
|
||||
|
||||
it('throws when no branch matches', () => {
|
||||
expect(() =>
|
||||
match(
|
||||
when((v) => v === 1, () => 'one')
|
||||
)(99)
|
||||
).toThrow('No matching pattern');
|
||||
});
|
||||
|
||||
it('does not call handlers for branches that were not selected', () => {
|
||||
const skipped = vi.fn(() => 'skipped');
|
||||
const selected = vi.fn(() => 'selected');
|
||||
|
||||
match(
|
||||
when((v) => v === 1, selected),
|
||||
when(any, skipped)
|
||||
)(1);
|
||||
|
||||
expect(selected).toHaveBeenCalledOnce();
|
||||
expect(skipped).not.toHaveBeenCalled();
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,203 @@
|
||||
import { describe, it, expect, vi } from 'vitest';
|
||||
import {
|
||||
ok,
|
||||
fail,
|
||||
catchResult,
|
||||
bind,
|
||||
map,
|
||||
tap,
|
||||
tapError,
|
||||
mapError,
|
||||
match,
|
||||
switch_,
|
||||
pipe,
|
||||
} from '../js-fp3/library/result.js';
|
||||
|
||||
describe('ok / fail construction', () => {
|
||||
it('ok is success', () => {
|
||||
const result = ok(42);
|
||||
|
||||
expect(result.isSuccess).toBe(true);
|
||||
expect(result.isFailure).toBe(false);
|
||||
});
|
||||
|
||||
it('fail is failure', () => {
|
||||
const result = fail('oops');
|
||||
|
||||
expect(result.isFailure).toBe(true);
|
||||
expect(result.isSuccess).toBe(false);
|
||||
});
|
||||
|
||||
it('ok exposes value', () => {
|
||||
const result = ok(42);
|
||||
|
||||
expect(result.value).toBe(42);
|
||||
});
|
||||
|
||||
it('fail exposes error', () => {
|
||||
const result = fail('oops');
|
||||
|
||||
expect(result.error).toBe('oops');
|
||||
});
|
||||
});
|
||||
|
||||
describe('match', () => {
|
||||
it('calls onSuccess for ok', () => {
|
||||
const result = ok(10);
|
||||
|
||||
const output = match((v) => `value:${v}`, (e) => `error:${e}`)(result);
|
||||
|
||||
expect(output).toBe('value:10');
|
||||
});
|
||||
|
||||
it('calls onFailure for fail', () => {
|
||||
const result = fail('bad');
|
||||
|
||||
const output = match((v) => `value:${v}`, (e) => `error:${e}`)(result);
|
||||
|
||||
expect(output).toBe('error:bad');
|
||||
});
|
||||
});
|
||||
|
||||
describe('switch_', () => {
|
||||
it('calls onSuccess for ok', () => {
|
||||
const result = ok(7);
|
||||
let called = false;
|
||||
|
||||
switch_(() => { called = true; }, () => {})(result);
|
||||
|
||||
expect(called).toBe(true);
|
||||
});
|
||||
|
||||
it('calls onFailure for fail', () => {
|
||||
const result = fail('err');
|
||||
let called = false;
|
||||
|
||||
switch_(() => {}, () => { called = true; })(result);
|
||||
|
||||
expect(called).toBe(true);
|
||||
});
|
||||
});
|
||||
|
||||
describe('catchResult', () => {
|
||||
it('returns ok when no exception is thrown', () => {
|
||||
const result = catchResult(() => 99, (ex) => ex.message);
|
||||
|
||||
expect(result.isSuccess).toBe(true);
|
||||
expect(result.value).toBe(99);
|
||||
});
|
||||
|
||||
it('returns fail when an exception is thrown', () => {
|
||||
const result = catchResult(
|
||||
() => { throw new Error('boom'); },
|
||||
(ex) => ex.message
|
||||
);
|
||||
|
||||
expect(result.isFailure).toBe(true);
|
||||
expect(result.error).toBe('boom');
|
||||
});
|
||||
});
|
||||
|
||||
describe('bind', () => {
|
||||
it('chains to the next result on success', () => {
|
||||
const result = bind((v) => ok(`got ${v}`))(ok(5));
|
||||
|
||||
expect(result.value).toBe('got 5');
|
||||
});
|
||||
|
||||
it('short-circuits on failure without calling the binder', () => {
|
||||
const binder = vi.fn((v) => ok(`got ${v}`));
|
||||
const result = bind(binder)(fail('nope'));
|
||||
|
||||
expect(binder).not.toHaveBeenCalled();
|
||||
expect(result.error).toBe('nope');
|
||||
});
|
||||
|
||||
it('propagates the inner failure when the binder returns fail', () => {
|
||||
const result = bind(() => fail('inner fail'))(ok(5));
|
||||
|
||||
expect(result.error).toBe('inner fail');
|
||||
});
|
||||
});
|
||||
|
||||
describe('map', () => {
|
||||
it('transforms the value on success', () => {
|
||||
const result = map((v) => v * 2)(ok(3));
|
||||
|
||||
expect(result.value).toBe(6);
|
||||
});
|
||||
|
||||
it('does not call the mapper on failure', () => {
|
||||
const mapper = vi.fn((v) => v * 2);
|
||||
const result = map(mapper)(fail('err'));
|
||||
|
||||
expect(mapper).not.toHaveBeenCalled();
|
||||
expect(result.error).toBe('err');
|
||||
});
|
||||
});
|
||||
|
||||
describe('tap', () => {
|
||||
it('calls the action and returns the original result on success', () => {
|
||||
let seen = -1;
|
||||
const result = tap((v) => { seen = v; })(ok(8));
|
||||
|
||||
expect(seen).toBe(8);
|
||||
expect(result.value).toBe(8);
|
||||
});
|
||||
|
||||
it('does not call the action on failure', () => {
|
||||
const action = vi.fn();
|
||||
tap(action)(fail('err'));
|
||||
|
||||
expect(action).not.toHaveBeenCalled();
|
||||
});
|
||||
});
|
||||
|
||||
describe('tapError', () => {
|
||||
it('calls the action and returns the original result on failure', () => {
|
||||
let seen = '';
|
||||
const result = tapError((e) => { seen = e; })(fail('bad'));
|
||||
|
||||
expect(seen).toBe('bad');
|
||||
expect(result.error).toBe('bad');
|
||||
});
|
||||
|
||||
it('does not call the action on success', () => {
|
||||
const action = vi.fn();
|
||||
tapError(action)(ok(1));
|
||||
|
||||
expect(action).not.toHaveBeenCalled();
|
||||
});
|
||||
});
|
||||
|
||||
describe('mapError', () => {
|
||||
it('transforms the error on failure', () => {
|
||||
const result = mapError((e) => e.length)(fail('oops'));
|
||||
|
||||
expect(result.error).toBe(4);
|
||||
});
|
||||
|
||||
it('does not call the mapper on success', () => {
|
||||
const mapper = vi.fn((e) => e.length);
|
||||
const result = mapError(mapper)(ok(1));
|
||||
|
||||
expect(mapper).not.toHaveBeenCalled();
|
||||
expect(result.value).toBe(1);
|
||||
});
|
||||
});
|
||||
|
||||
describe('pipe', () => {
|
||||
it('applies functions left to right starting from the initial result', () => {
|
||||
const result = pipe(ok(2), map((v) => v + 1), map((v) => v * 3));
|
||||
|
||||
expect(result.value).toBe(9);
|
||||
});
|
||||
|
||||
it('short-circuits on the first failure', () => {
|
||||
const mapper = vi.fn((v) => v * 2);
|
||||
const result = pipe(fail('stop'), map(mapper));
|
||||
|
||||
expect(mapper).not.toHaveBeenCalled();
|
||||
expect(result.error).toBe('stop');
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,86 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { createWithdrawMoney } from '../js-fp3/application/accountApp.js';
|
||||
import { openAccount } from '../js-fp3/domain/account.js';
|
||||
import { createMoney } from '../js-fp3/domain/money.js';
|
||||
import { createInMemoryRepository } from '../js-fp3/infrastructure/repository.js';
|
||||
|
||||
const buildHandler = () => {
|
||||
const repo = createInMemoryRepository();
|
||||
const withdraw = createWithdrawMoney(repo).value;
|
||||
return { withdraw, repo };
|
||||
};
|
||||
|
||||
describe('withdrawMoney application use case', () => {
|
||||
it('withdrawing from an account reduces its balance by the withdrawn amount', () => {
|
||||
const { withdraw, repo } = buildHandler();
|
||||
const accountId = 'acc-1';
|
||||
repo.saveAccount(openAccount(accountId, createMoney(200)).value);
|
||||
|
||||
withdraw(accountId, 75);
|
||||
|
||||
const account = repo.loadAccount(accountId).value;
|
||||
expect(account.balance.amount).toBe(125);
|
||||
});
|
||||
|
||||
it('withdrawing the entire balance leaves the account at zero', () => {
|
||||
const { withdraw, repo } = buildHandler();
|
||||
const accountId = 'acc-2';
|
||||
repo.saveAccount(openAccount(accountId, createMoney(100)).value);
|
||||
|
||||
withdraw(accountId, 100);
|
||||
|
||||
const account = repo.loadAccount(accountId).value;
|
||||
expect(account.balance.amount).toBe(0);
|
||||
});
|
||||
|
||||
it('withdrawing from a non-existent account returns accountNotFound', () => {
|
||||
const { withdraw } = buildHandler();
|
||||
|
||||
const result = withdraw('no-such-id', 50);
|
||||
|
||||
expect(result.error.type).toBe('AccountNotFound');
|
||||
});
|
||||
|
||||
it('withdrawing more than the available balance returns insufficientBalance', () => {
|
||||
const { withdraw, repo } = buildHandler();
|
||||
const accountId = 'acc-3';
|
||||
repo.saveAccount(openAccount(accountId, createMoney(50)).value);
|
||||
|
||||
const result = withdraw(accountId, 100);
|
||||
|
||||
expect(result.error.type).toBe('InsufficientBalance');
|
||||
});
|
||||
|
||||
it('accountNotFound error reports the requested account id', () => {
|
||||
const { withdraw } = buildHandler();
|
||||
const accountId = 'missing-acc';
|
||||
|
||||
const error = withdraw(accountId, 50).error;
|
||||
|
||||
expect(error.type).toBe('AccountNotFound');
|
||||
expect(error.accountId).toBe(accountId);
|
||||
});
|
||||
|
||||
it('insufficientBalance error reports the current balance and attempted amount', () => {
|
||||
const { withdraw, repo } = buildHandler();
|
||||
const accountId = 'acc-4';
|
||||
repo.saveAccount(openAccount(accountId, createMoney(50)).value);
|
||||
|
||||
const error = withdraw(accountId, 120).error;
|
||||
|
||||
expect(error.type).toBe('InsufficientBalance');
|
||||
expect(error.balance.amount).toBe(50);
|
||||
expect(error.amount.amount).toBe(120);
|
||||
});
|
||||
|
||||
it('after a failed withdrawal the balance is unchanged', () => {
|
||||
const { withdraw, repo } = buildHandler();
|
||||
const accountId = 'acc-5';
|
||||
repo.saveAccount(openAccount(accountId, createMoney(50)).value);
|
||||
|
||||
withdraw(accountId, 999);
|
||||
|
||||
const account = repo.loadAccount(accountId).value;
|
||||
expect(account.balance.amount).toBe(50);
|
||||
});
|
||||
});
|
||||
Reference in New Issue
Block a user