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instanceof.spec.ts
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98 lines (84 loc) · 2.67 KB
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import * as util from "../../util";
test("instanceof", () => {
util.testFunction`
class myClass {}
const instance = new myClass();
return instance instanceof myClass;
`.expectToMatchJsResult();
});
test("instanceof inheritance", () => {
util.testFunction`
class myClass {}
class childClass extends myClass {}
const instance = new childClass();
return instance instanceof myClass;
`.expectToMatchJsResult();
});
test("instanceof inheritance false", () => {
util.testFunction`
class myClass {}
class childClass extends myClass {}
const instance = new myClass();
return instance instanceof childClass;
`.expectToMatchJsResult();
});
test("{} instanceof Object", () => {
util.testExpression`{} instanceof Object`.expectToMatchJsResult();
});
test("function instanceof Object", () => {
util.testExpression`(() => {}) instanceof Object`.expectToMatchJsResult();
});
test("null instanceof Object", () => {
util.testExpression`(null as any) instanceof Object`.expectToMatchJsResult();
});
test("instanceof undefined", () => {
util.testExpression`{} instanceof (undefined as any)`.expectToMatchJsResult(true);
});
test("null instanceof Class", () => {
util.testFunction`
class myClass {}
return (null as any) instanceof myClass;
`.expectToMatchJsResult();
});
test("function instanceof Class", () => {
util.testFunction`
class myClass {}
const noop = () => {};
return (noop as any) instanceof myClass;
`.expectToMatchJsResult();
});
test("boolean instanceof Class", () => {
util.testFunction`
class myClass {}
return (false as any) instanceof myClass;
`.expectToMatchJsResult();
});
test("number instanceof Class", () => {
util.testFunction`
class myClass {}
return (5 as any) instanceof myClass;
`.expectToMatchJsResult();
});
test("instanceof export", () => {
util.testModule`
export class myClass {}
const instance = new myClass();
export const result = instance instanceof myClass;
`
.setReturnExport("result")
.expectToMatchJsResult();
});
test("instanceof Symbol.hasInstance", () => {
util.testFunction`
class myClass {
static [Symbol.hasInstance](instance: unknown) {
return false;
}
}
const instance = new myClass();
const isInstanceOld = instance instanceof myClass;
myClass[Symbol.hasInstance] = () => true;
const isInstanceNew = instance instanceof myClass;
return { isInstanceOld, isInstanceNew };
`.expectToMatchJsResult();
});