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Add tests for slang
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‎src/mocks/context.ts‎

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import { Context } from '../slang/types'
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import createContext from '../slang/createContext'
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export function mockContext(): Context {
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return createContext()
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}

‎src/slang/__tests__/__snapshots__/index.ts.snap‎

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// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`Arrow function definition returns itself 1`] = `
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Object {
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"status": "finished",
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"value": ArrowClosure {
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"frame": Object {
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"environment": Object {
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"display": [Function],
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"error": [Function],
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"math_PI": 3.141592653589793,
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"math_sqrt": [Function],
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"parse_int": [Function],
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"prompt": [Function],
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"runtime": [Function],
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"undefined": undefined,
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},
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"name": "global",
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"parent": null,
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},
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"fun": [Function],
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"name": "Anonymous1",
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"node": Node {
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"__id": "node_12",
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"body": Node {
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"__id": "node_11",
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"end": 8,
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"loc": SourceLocation {
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"end": Position {
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"column": 8,
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"line": 1,
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},
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"start": Position {
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"column": 6,
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"line": 1,
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},
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},
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"raw": "42",
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"start": 6,
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"type": "Literal",
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"value": 42,
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},
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"end": 8,
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"expression": true,
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"generator": false,
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"id": null,
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"loc": SourceLocation {
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"end": Position {
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"column": 8,
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"line": 1,
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},
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"start": Position {
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"column": 0,
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"line": 1,
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},
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},
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"params": Array [],
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"start": 0,
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"type": "ArrowFunctionExpression",
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},
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},
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}
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`;
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exports[`Arrow function definition returns itself 2`] = `
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ArrowClosure {
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"frame": Object {
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"environment": Object {
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"display": [Function],
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"error": [Function],
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"math_PI": 3.141592653589793,
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"math_sqrt": [Function],
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"parse_int": [Function],
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"prompt": [Function],
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"runtime": [Function],
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"undefined": undefined,
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},
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"name": "global",
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"parent": null,
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},
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"fun": [Function],
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"name": "Anonymous1",
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"node": Node {
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"__id": "node_12",
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"body": Node {
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"__id": "node_11",
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"end": 8,
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"loc": SourceLocation {
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"end": Position {
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"column": 8,
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"line": 1,
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},
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"start": Position {
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"column": 6,
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"line": 1,
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},
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},
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"raw": "42",
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"start": 6,
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"type": "Literal",
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"value": 42,
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},
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"end": 8,
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"expression": true,
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"generator": false,
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"id": null,
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"loc": SourceLocation {
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"end": Position {
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"column": 8,
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"line": 1,
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},
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"start": Position {
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"column": 0,
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"line": 1,
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},
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},
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"params": Array [],
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"start": 0,
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"type": "ArrowFunctionExpression",
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},
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}
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`;
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exports[`Empty code returns undefined 1`] = `
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Object {
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"status": "finished",
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"value": undefined,
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}
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`;
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exports[`Factorial arrow function 1`] = `
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Object {
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"status": "finished",
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"value": 120,
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}
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`;
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exports[`Single boolean self-evaluates to itself 1`] = `
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Object {
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"status": "finished",
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"value": true,
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}
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`;
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exports[`Single number self-evaluates to itself 1`] = `
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Object {
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"status": "finished",
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"value": 42,
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}
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`;
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exports[`Single string self-evaluates to itself 1`] = `
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Object {
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"status": "finished",
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"value": "42",
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}
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`;

‎src/slang/__tests__/__snapshots__/parser.ts.snap‎

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// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`Empty parse returns empty Program Node 1`] = `
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Node {
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"__id": "node_1",
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"body": Array [],
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"end": 0,
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"loc": SourceLocation {
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"end": Position {
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"column": 0,
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"line": 1,
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},
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"start": Position {
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"column": 0,
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"line": 1,
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},
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},
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"sourceType": "script",
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"start": 0,
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"type": "Program",
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}
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`;
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exports[`Parse a single number 1`] = `
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Node {
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"__id": "node_7",
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"body": Array [
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Node {
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"__id": "node_6",
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"end": 3,
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"expression": Node {
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"__id": "node_5",
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"end": 2,
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"loc": SourceLocation {
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"end": Position {
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"column": 2,
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"line": 1,
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},
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"start": Position {
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"column": 0,
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"line": 1,
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},
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},
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"raw": "42",
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"start": 0,
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"type": "Literal",
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"value": 42,
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},
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"loc": SourceLocation {
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"end": Position {
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"column": 3,
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"line": 1,
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},
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"start": Position {
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"column": 0,
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"line": 1,
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},
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},
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"start": 0,
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"type": "ExpressionStatement",
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},
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],
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"end": 3,
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"loc": SourceLocation {
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"end": Position {
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"column": 3,
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"line": 1,
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},
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"start": Position {
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"column": 0,
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"line": 1,
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},
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},
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"sourceType": "script",
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"start": 0,
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"type": "Program",
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}
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`;
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exports[`Parse a single string 1`] = `
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Node {
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"__id": "node_4",
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"body": Array [
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Node {
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"__id": "node_3",
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"directive": "42",
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"end": 5,
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"expression": Node {
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"__id": "node_2",
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"end": 4,
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"loc": SourceLocation {
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"end": Position {
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"column": 4,
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"line": 1,
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},
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"start": Position {
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"column": 0,
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"line": 1,
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},
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},
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"raw": "'42'",
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"start": 0,
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"type": "Literal",
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"value": "42",
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},
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"loc": SourceLocation {
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"end": Position {
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"column": 5,
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"line": 1,
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},
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"start": Position {
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"column": 0,
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"line": 1,
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},
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},
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"start": 0,
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"type": "ExpressionStatement",
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},
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],
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"end": 5,
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"loc": SourceLocation {
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"end": Position {
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"column": 5,
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"line": 1,
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},
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"start": Position {
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"column": 0,
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"line": 1,
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},
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},
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"sourceType": "script",
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"start": 0,
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"type": "Program",
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}
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`;

‎src/slang/__tests__/index.ts‎

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import { stripIndent } from 'common-tags'
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import { mockContext } from '../../mocks/context'
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import { runInContext } from '../index'
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test('Empty code returns undefined', () => {
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const code = ''
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const context = mockContext()
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const promise = runInContext(code, context)
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return promise.then(obj => {
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expect(obj).toMatchSnapshot()
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expect(obj.status).toBe('finished')
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expect(obj.value).toBe(undefined)
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})
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})
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test('Single string self-evaluates to itself', () => {
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const code = "'42';"
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const context = mockContext()
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const promise = runInContext(code, context)
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return promise.then(obj => {
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expect(obj).toMatchSnapshot()
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expect(obj.status).toBe('finished')
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expect(obj.value).toBe('42')
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})
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})
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test('Single number self-evaluates to itself', () => {
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const code = '42;'
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const context = mockContext()
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const promise = runInContext(code, context)
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return promise.then(obj => {
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expect(obj).toMatchSnapshot()
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expect(obj.status).toBe('finished')
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expect(obj.value).toBe(42)
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})
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})
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test('Single boolean self-evaluates to itself', () => {
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const code = 'true;'
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const context = mockContext()
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const promise = runInContext(code, context)
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return promise.then(obj => {
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expect(obj).toMatchSnapshot()
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expect(obj.status).toBe('finished')
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expect(obj.value).toBe(true)
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})
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})
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test('Arrow function definition returns itself', () => {
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const code = '() => 42;'
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const context = mockContext()
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const promise = runInContext(code, context)
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return promise.then(obj => {
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expect(obj).toMatchSnapshot()
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expect(obj.status).toBe('finished')
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expect(obj.value).toMatchSnapshot()
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})
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})
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test('Factorial arrow function', () => {
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const code = stripIndent`
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const fac = (i) => i === 1 ? 1 : i * fac(i-1);
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fac(5);
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`
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const context = mockContext()
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const promise = runInContext(code, context)
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return promise.then(obj => {
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expect(obj).toMatchSnapshot()
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expect(obj.status).toBe('finished')
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expect(obj.value).toBe(120)
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})
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})

‎src/slang/__tests__/parser.ts‎

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import { mockContext } from '../../mocks/context'
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import { parse } from '../parser'
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test('Empty parse returns empty Program Node', () => {
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const context = mockContext()
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const program = parse('', context)
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expect(program).toMatchSnapshot()
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})
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test('Parse a single string', () => {
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const context = mockContext()
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const program = parse("'42';", context)
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expect(program).toMatchSnapshot()
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})
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test('Parse a single number', () => {
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const context = mockContext()
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const program = parse('42;', context)
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expect(program).toMatchSnapshot()
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})

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