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// this file is compatible with jest to test node.js' util.inspect as well as bun's
const util = require("util");
test("util.inspect.custom exists", () => {
expect(util.inspect.custom).toEqual(Symbol.for("nodejs.util.inspect.custom"));
});
const customSymbol = util.inspect.custom;
for (const [name, inspect] of process.versions.bun
? [
["util.inspect", util.inspect],
["Bun.inspect", Bun.inspect],
]
: [["util.inspect", util.inspect]]) {
test(name + " calls inspect.custom", () => {
const obj = {
[customSymbol]() {
return "42";
},
};
expect(inspect(obj)).toBe("42");
});
test(name + " calls inspect.custom recursivly", () => {
const obj = {
[customSymbol]() {
return {
[customSymbol]() {
return "42";
},
};
},
};
expect(inspect(obj)).toBe("42");
});
test(name + " calls inspect.custom recursivly nested", () => {
const obj = {
[customSymbol]() {
return {
prop: {
[customSymbol]() {
return "42";
},
},
};
},
};
expect(inspect(obj).replace(/\s/g, "")).toBe("{prop:42}");
});
test(name + " calls inspect.custom recursivly nested 2", () => {
const obj = {
prop: {
[customSymbol]() {
return {
[customSymbol]() {
return "42";
},
};
},
},
};
expect(inspect(obj).replace(/\s/g, "")).toBe("{prop:42}");
});
test(name + " calls inspect.custom with valid options", () => {
const obj = {
[customSymbol](depth, options, inspect) {
expect(this === obj).toBe(true);
expect(inspect).toBe(util.inspect);
expect(options.stylize).toBeDefined();
expect(depth).toBeDefined(2);
return "good";
},
};
expect(inspect(obj).replace(/\s/g, "")).toBe("good");
});
test(name + " stylize function works without color", () => {
const obj = {
[customSymbol](depth, options, inspect) {
expect(options.stylize).toBeDefined();
expect(options.stylize("foo", "whatever")).toBe("foo");
expect(options.stylize("hello", "string")).toBe("hello");
return "good";
},
};
expect(inspect(obj).replace(/\s/g, "")).toBe("good");
});
test(name + " stylize function works with color", () => {
const obj = {
[customSymbol](depth, options, inspect) {
expect(options.stylize).toBeDefined();
expect(options.stylize("foo", "invalid")).toBe("foo");
expect(options.stylize("foo", "boolean")).toBe("\u001b[33mfoo\u001b[39m");
expect(options.stylize("hello", "string")).toBe("\u001b[32mhello\u001b[39m");
return "good";
},
};
expect(inspect(obj, { colors: true }).replace(/\s/g, "")).toBe("good");
});
test(name + " stylize function gives correct depth", () => {
const obj = {
[customSymbol](depth, options, inspect) {
return [depth, options.depth];
},
};
expect(inspect(obj, { depth: 3 }).replace(/\s/g, "")).toBe("[3,3]");
});
test(name + " stylize function gives correct depth", () => {
const obj = {
prop: {
[customSymbol](depth, options, inspect) {
return [depth, options.depth];
},
},
};
expect(inspect(obj, { depth: 3 }).replace(/\s/g, "")).toBe("{prop:[2,3]}");
});
test(name + " non-callable does not get called", () => {
const obj = {
[customSymbol]: 512,
};
expect(inspect(obj, { depth: 3 }).replace(/\s/g, "")).toBe("{[Symbol(nodejs.util.inspect.custom)]:512}");
});
const exceptions = [new Error("don't crash!"), 42];
test.each(exceptions)(name + " handles exceptions %s", err => {
const obj = {
[customSymbol]() {
throw err;
},
};
if (Bun.inspect === inspect) {
// make sure this doesnt crash
expect(inspect(obj)).toBeString();
} else {
expect(() => inspect(obj)).toThrow();
}
});
}
|
