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unusableMethodName.test.ts

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// For any function, the property 'name' is an unwritable property.

// The value returned by java.import(<classname>) is a constructor-like function that has the shape of the class.

// In particular, any static methods of the class will be added as properties of the function.

// If a class has a static method named 'name', then an exception woudld be thrown when

// node-java attempts to set assign the static method to the .name property of constructor-like function.

// As a workaround, node-java will append the `ifReadOnlySuffix` to the property name.

import { beforeAll, describe, expect, test } from "vitest";

import { getJava } from "../testHelpers";

import { Java } from "../java";

describe("unusableMethodName", () => {

let java!: Java;

beforeAll(async () => {

java = await getJava(

{

syncSuffix: "Sync",

asyncSuffix: "",

ifReadOnlySuffix: "_alt",

},

{

beforeInit: (java) => {

function before(callback: () => void): void {

java.classpath.push("test/");

expect(java.isJvmCreated()).toBeFalsy();

callback();

}

function after(callback: () => void): void {

expect(java.isJvmCreated()).toBeTruthy();

callback();

}

java.registerClient(before, after);

},

}

);

await new Promise<void>((resolve) => {

java.ensureJvm(function (err: Error | undefined) {

expect(err).toBeFalsy();

expect(java.isJvmCreated()).toBeTruthy();

resolve();

});

});

});

test("unusableMethodName_nameThrows", () => {

const Test = java.import("Test");

expect(Test).toBeTruthy();

expect(() => {

Test.name((_err: Error | undefined) => {

throw new Error("should not get here");

});

}).toThrowError(TypeError);

});

test("unusableMethodName_callerThrows", () => {

const Test = java.import("Test");

expect(Test).toBeTruthy();

expect(() => {

Test.caller((_err: Error | undefined) => {

throw new Error("should not get here");

});

}).toThrowError(TypeError);

});

test("unusableMethodName_argumentsThrows", () => {

const Test = java.import("Test");

expect(Test).toBeTruthy();

expect(() => {

Test.arguments((_err: Error | undefined) => {

throw new Error("should not get here");

});

}).toThrowError(TypeError);

});

test("alternateMethodName_name_altWorks", async () => {

const Test = java.import("Test");

expect(Test).toBeTruthy();

await new Promise<void>((resolve) => {

Test.name_alt((err: Error | undefined, val: string | undefined) => {

expect(err).toBeFalsy();

expect(val).toBe("name");

resolve();

});

});

});

test("alternateMethodName_caller_altWorks", async () => {

const Test = java.import("Test");

expect(Test).toBeTruthy();

await new Promise<void>((resolve) => {

Test.caller_alt((err: Error | undefined, val: string | undefined) => {

expect(err).toBeFalsy();

expect(val).toBe("caller");

resolve();

});

});

});

test("alternateMethodName_arguments_altWorks", async () => {

const Test = java.import("Test");

expect(Test).toBeTruthy();

await new Promise<void>((resolve) => {

Test.arguments_alt((err: Error | undefined, val: string | undefined) => {

expect(err).toBeFalsy();

expect(val).toBe("arguments");

resolve();

});

});

});

test("reservedFieldName", () => {

const TestEnum = java.import("Test$Enum");

expect(TestEnum).toBeTruthy();

// 'foo' and 'bar' are valid enum names

expect(TestEnum.foo.toStringSync()).toBe("foo");

expect(TestEnum.bar.toStringSync()).toBe("bar");

// TestEnum.name is actually the name of the proxy constructor function.

expect(TestEnum.name).toBe("javaClassConstructorProxy");

// Instead we need to access TestEnum.name_alt

expect(TestEnum.name_alt.toString()).toBe("name");

expect(TestEnum.caller_alt.toString()).toBe("caller");

expect(TestEnum.arguments_alt.toString()).toBe("arguments");

});

});