53 lines
1.4 KiB
TypeScript
53 lines
1.4 KiB
TypeScript
import { assertDefined } from "./assert";
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describe("assert", () => {
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describe("assertDefined", () => {
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it("passes for simple values", () => {
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{
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const value: number | undefined = 123;
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assertDefined(value);
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expect(value).toEqual(123);
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}
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{
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const value: string | undefined = "abc";
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assertDefined(value);
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expect(value).toEqual("abc");
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}
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});
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it("passes for falsy values", () => {
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{
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const value: number | undefined = 0;
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assertDefined(value);
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expect(value).toEqual(0);
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}
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{
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const value: string | undefined = "";
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assertDefined(value);
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expect(value).toEqual("");
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}
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{
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const value: null | undefined = null;
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assertDefined(value);
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expect(value).toEqual(null);
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}
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});
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it("throws for undefined values", () => {
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{
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const value: number | undefined = undefined;
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expect(() => assertDefined(value)).toThrowError("value is undefined");
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}
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{
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let value: string | undefined;
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expect(() => assertDefined(value)).toThrowError("value is undefined");
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}
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});
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it("throws with custom message", () => {
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const value: number | undefined = undefined;
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expect(() => assertDefined(value, "Bug in the data source")).toThrowError("Bug in the data source");
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});
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});
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});
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