import { describe, it } from 'node:test'
import assert from 'node:assert/strict'
import { readFile } from 'node:fs/promises'
import { Template } from './index.mjs'
describe('Templating Engine', () => {
it('should render a string literal with the variables interpolated', async () => {
const data = {
name: 'John',
time: 'today'
}
const template = new Template('Hello ${name}! How are you ${time}?', data)
const expected = 'Hello John! How are you today?'
const actual = await template.render()
assert.equal(actual, expected)
})
it('should inject a file into a template with ${await file(path/to/file)}', async () => {
const partials = new Map()
partials.set('layout.html', await readFile('./layout.html', 'utf8'))
const template = new Template(await readFile('./test.html', 'utf8'), {}, partials)
const expected = `
This is a test html file
`
const actual = await template.render()
assert.equal(actual, expected)
})
it('should loop over a list of items and render them in the template', async () => {
const data = {
items: [
{
name: 'John'
},
{
name: 'Jane'
}
]
}
const template = new Template(await readFile('./test-loop.html', 'utf8'), data)
const expected = `
John
Jane
`
const actual = await template.render()
assert.equal(actual, expected)
})
it('should render complex objects in the template', async () => {
const data = {
users: [
{
name: 'John',
address: {
street: '123 Main St',
city: 'Anytown',
state: 'CA'
}
},
{
name: 'Jane',
address: {
street: '456 Main St',
city: 'Anytown',
state: 'CA'
}
}
]
}
const template = new Template(await readFile('./test-complex.html', 'utf8'), data)
const expected = `
John
123 Main St
Anytown
CA
Jane
456 Main St
Anytown
CA
`
const actual = await template.render()
assert.equal(actual, expected)
})
it('should allow custom functions to be used the template', async () => {
const data = {
name: 'John',
time: 'today'
}
const template = new Template(await readFile('./test-custom-functions.html'), data, null, {
customFunction: () => 'Hello'
})
const expected = 'Hello John! How are you today?'
const actual = await template.render()
assert.equal(actual, expected)
})
it('should output an error message in the console, but not crash', async () => {
const data = {
time: 'today'
}
const template = new Template('Hello ${name}! How are you ${time}?', data)
const expected = 'Hello John! How are you today?'
try {
await template.render()
} catch (e) {
assert.match(e.stack, /result \= /)
assert.equal(e.message, 'name is not defined')
}
})
})