Module
Utilities to help mock behavior, spy on function calls, stub methods, and fake time for tests.
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Deno.test("assertPassthrough function", () => { const point: Point = new Point(2, 3); const point2: Point = new Point(3, 4); const callToString: (point: Point) => string = (point: Point) => { return point.toString(); };
assertPassthrough({ func: callToString, args: [point], returned: "6, 7", target: { instance: point, method: "toString", self: point, args: [], returned: "6, 7", }, }); assertThrows( () => assertPassthrough({ func: callToString, args: [point], returned: "2, 3", target: { instance: point, method: "toString", args: [point], returned: "6, 7", }, }), AssertionError, "passthrough did not return expected value", ); assertThrows( () => assertPassthrough({ func: callToString, args: [point], returned: "6, 7", target: { instance: point, method: "toString", self: point2, args: [], returned: "6, 7", }, }), AssertionError, "target not called on expected self", ); assertThrows( () => assertPassthrough({ func: callToString, args: [point], returned: "6, 7", target: { instance: point, method: "toString", args: [5, 6], returned: "6, 7", }, }), AssertionError, "target not called with expected args", ); assertThrows( () => assertPassthrough({ func: callToString, args: [5, 8], returned: "6, 7", target: { instance: point, method: "toString", args: [point], returned: "6, 7", }, }), AssertionError, "passthrough did not return expected value", );});
Deno.test("assertPassthrough instance", () => { const point: Point = new Point(2, 3); const point2: Point = new Point(3, 4); const callAction: (a: number, b: number) => number = ( a: number, b: number, ) => { return 3 * point.action.call(point2, a * 2, b * 2); }; const fakePoint: Partial<Point> = { action: callAction };
assertPassthrough({ instance: fakePoint, method: "action", args: [5, 8], returned: 9, target: { instance: point, self: point2, args: [10, 16], returned: 3, }, }); assertThrows( () => assertPassthrough({ instance: fakePoint, method: "action", args: [5, 8], returned: 15, target: { instance: point, self: point2, args: [10, 16], returned: 3, }, }), AssertionError, "passthrough did not return expected value", ); assertThrows( () => assertPassthrough({ instance: fakePoint, method: "action", args: [5, 8], returned: 9, target: { instance: point, self: point, args: [10, 16], returned: 3, }, }), AssertionError, "target not called on expected self", ); assertThrows( () => assertPassthrough({ instance: fakePoint, method: "action", args: [5, 8], returned: 9, target: { instance: point, self: point2, args: [19, 16], returned: 3, }, }), AssertionError, "target not called with expected args", ); assertThrows( () => assertPassthrough({ instance: fakePoint, method: "action", target: { instance: point, self: point2, }, }), AssertionError, "passthrough did not return expected value", ); assertThrows( () => assertPassthrough({ instance: fakePoint, args: [5, 8], returned: 9, target: { instance: point, self: point2, args: [10, 16], returned: 3, }, } as unknown as PassthroughOptions<Partial<Point>, Point>), Error, "target instance or passthrough must have method", ); assertThrows( () => assertPassthrough({ instance: fakePoint, method: "invalid", args: [5, 8], returned: 9, target: { instance: point, self: point2, args: [10, 16], returned: 3, }, }), Error, "passthrough not a function", );});
Deno.test("assertSpyCalls", () => { const spyFunc: Spy<void> = spy();
assertSpyCalls(spyFunc, 0); assertThrows( () => assertSpyCalls(spyFunc, 1), AssertionError, "spy not called as much as expected", );
spyFunc(); assertSpyCalls(spyFunc, 1); assertThrows( () => assertSpyCalls(spyFunc, 0), AssertionError, "spy called more than expected", ); assertThrows( () => assertSpyCalls(spyFunc, 2), AssertionError, "spy not called as much as expected", );});
Deno.test("assertSpyCallsMin", () => { const spyFunc: Spy<void> = spy();
assertSpyCallsMin(spyFunc, 0); assertThrows( () => assertSpyCallsMin(spyFunc, 1), AssertionError, "spy not called as much as expected", );
spyFunc(); assertSpyCallsMin(spyFunc, 1); assertThrows( () => assertSpyCallsMin(spyFunc, 2), AssertionError, "spy not called as much as expected", );});
Deno.test("assertSpyCall function", () => { const spyFunc: Spy<void> = spy(() => 5);
assertThrows( () => assertSpyCall(spyFunc, 0), AssertionError, "spy not called as much as expected", );
spyFunc(); assertSpyCall(spyFunc, 0); assertSpyCall(spyFunc, 0, { args: [], self: undefined, returned: 5, }); assertSpyCall(spyFunc, 0, { args: [], }); assertSpyCall(spyFunc, 0, { self: undefined, }); assertSpyCall(spyFunc, 0, { returned: 5, });
assertThrows( () => assertSpyCall(spyFunc, 0, { args: [1], self: {}, returned: 2, }), AssertionError, "spy not called with expected args", ); assertThrows( () => assertSpyCall(spyFunc, 0, { args: [1], }), AssertionError, "spy not called with expected args", ); assertThrows( () => assertSpyCall(spyFunc, 0, { self: {}, }), AssertionError, "spy not called as method on expected self", ); assertThrows( () => assertSpyCall(spyFunc, 0, { returned: 2, }), AssertionError, "spy call did not return expected value", ); assertThrows( () => assertSpyCall(spyFunc, 0, { error: { msg: "x" }, }), AssertionError, "spy call did not throw an error, a value was returned.", ); assertThrows( () => assertSpyCall(spyFunc, 1), AssertionError, "spy not called as much as expected", );});
Deno.test("assertSpyCall method", () => { const point: Point = new Point(2, 3); const spyMethod: Spy<Point> = spy(point, "action");
assertThrows( () => assertSpyCall(spyMethod, 0), AssertionError, "spy not called as much as expected", );
point.action(3, 7); assertSpyCall(spyMethod, 0); assertSpyCall(spyMethod, 0, { args: [3, 7], self: point, returned: 3, }); assertSpyCall(spyMethod, 0, { args: [3, 7], }); assertSpyCall(spyMethod, 0, { self: point, }); assertSpyCall(spyMethod, 0, { returned: 3, });
assertThrows( () => assertSpyCall(spyMethod, 0, { args: [7, 4], self: undefined, returned: 7, }), AssertionError, "spy not called with expected args", ); assertThrows( () => assertSpyCall(spyMethod, 0, { args: [7, 3], }), AssertionError, "spy not called with expected args", ); assertThrows( () => assertSpyCall(spyMethod, 0, { self: undefined, }), AssertionError, "spy not expected to be called as method on object", ); assertThrows( () => assertSpyCall(spyMethod, 0, { returned: 7, }), AssertionError, "spy call did not return expected value", ); assertThrows( () => assertSpyCall(spyMethod, 1), AssertionError, "spy not called as much as expected", );
spyMethod(9); assertSpyCall(spyMethod, 1); assertSpyCall(spyMethod, 1, { args: [9], self: undefined, returned: 9, }); assertSpyCall(spyMethod, 1, { args: [9], }); assertSpyCall(spyMethod, 1, { self: undefined, }); assertSpyCall(spyMethod, 1, { returned: 9, });
assertThrows( () => assertSpyCall(spyMethod, 1, { args: [7, 4], self: point, returned: 7, }), AssertionError, "spy not called with expected args", ); assertThrows( () => assertSpyCall(spyMethod, 1, { args: [7, 3], }), AssertionError, "spy not called with expected args", ); assertThrows( () => assertSpyCall(spyMethod, 1, { self: point, }), AssertionError, "spy not called as method on expected self", ); assertThrows( () => assertSpyCall(spyMethod, 1, { returned: 7, }), AssertionError, "spy call did not return expected value", ); assertThrows( () => assertSpyCall(spyMethod, 1, { error: { msg: "x" }, }), AssertionError, "spy call did not throw an error, a value was returned.", ); assertThrows( () => assertSpyCall(spyMethod, 2), AssertionError, "spy not called as much as expected", );});
class ExampleError extends Error {}class OtherError extends Error {}
Deno.test("assertSpyCall error", () => { const spyFunc: Spy<void> = spy(() => { throw new ExampleError("failed"); });
assertThrows(() => spyFunc(), ExampleError, "fail"); assertSpyCall(spyFunc, 0); assertSpyCall(spyFunc, 0, { args: [], self: undefined, error: { Class: ExampleError, msg: "fail", }, }); assertSpyCall(spyFunc, 0, { args: [], }); assertSpyCall(spyFunc, 0, { self: undefined, }); assertSpyCall(spyFunc, 0, { error: { Class: ExampleError, msg: "fail", }, }); assertSpyCall(spyFunc, 0, { error: { Class: Error, msg: "fail", }, });
assertThrows( () => assertSpyCall(spyFunc, 0, { args: [1], self: {}, error: { Class: OtherError, msg: "fail", }, }), AssertionError, "spy not called with expected args", ); assertThrows( () => assertSpyCall(spyFunc, 0, { args: [1], }), AssertionError, "spy not called with expected args", ); assertThrows( () => assertSpyCall(spyFunc, 0, { self: {}, }), AssertionError, "spy not called as method on expected self", ); assertThrows( () => assertSpyCall(spyFunc, 0, { error: { Class: OtherError, msg: "fail", }, }), AssertionError, 'Expected error to be instance of "OtherError", but was "ExampleError".', ); assertThrows( () => assertSpyCall(spyFunc, 0, { error: { Class: OtherError, msg: "x", }, }), AssertionError, 'Expected error to be instance of "OtherError", but was "ExampleError".', ); assertThrows( () => assertSpyCall(spyFunc, 0, { error: { Class: ExampleError, msg: "x", }, }), AssertionError, 'Expected error message to include "x", but got "failed".', ); assertThrows( () => assertSpyCall(spyFunc, 0, { error: { Class: Error, msg: "x", }, }), AssertionError, 'Expected error message to include "x", but got "failed".', ); assertThrows( () => assertSpyCall(spyFunc, 0, { error: { msg: "x", }, }), AssertionError, 'Expected error message to include "x", but got "failed".', ); assertThrows( () => assertSpyCall(spyFunc, 0, { returned: 7, }), AssertionError, "spy call did not return expected value, an error was thrown.", ); assertThrows( () => assertSpyCall(spyFunc, 1), AssertionError, "spy not called as much as expected", );});
Deno.test("assertSpyCallAsync function", async () => { const spyFunc: Spy<void> = spy(() => Promise.resolve(5));
await assertRejects( () => assertSpyCallAsync(spyFunc, 0), AssertionError, "spy not called as much as expected", );
await spyFunc(); await assertSpyCallAsync(spyFunc, 0); await assertSpyCallAsync(spyFunc, 0, { args: [], self: undefined, returned: 5, }); await assertSpyCallAsync(spyFunc, 0, { args: [], self: undefined, returned: Promise.resolve(5), }); await assertSpyCallAsync(spyFunc, 0, { args: [], }); await assertSpyCallAsync(spyFunc, 0, { self: undefined, }); await assertSpyCallAsync(spyFunc, 0, { returned: Promise.resolve(5), });
await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { args: [1], self: {}, returned: 2, }), AssertionError, "spy not called with expected args", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { args: [1], }), AssertionError, "spy not called with expected args", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { self: {}, }), AssertionError, "spy not called as method on expected self", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { returned: 2, }), AssertionError, "spy call did not resolve to expected value", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { returned: Promise.resolve(2), }), AssertionError, "spy call did not resolve to expected value", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 1), AssertionError, "spy not called as much as expected", );});
Deno.test("assertSpyCallAsync method", async () => { const point: Point = new Point(2, 3); const spyMethod: Stub<Point> = stub( point, "action", (x?: number) => Promise.resolve(x), );
await assertRejects( () => assertSpyCallAsync(spyMethod, 0), AssertionError, "spy not called as much as expected", );
await point.action(3, 7); await assertSpyCallAsync(spyMethod, 0); await assertSpyCallAsync(spyMethod, 0, { args: [3, 7], self: point, returned: 3, }); await assertSpyCallAsync(spyMethod, 0, { args: [3, 7], self: point, returned: Promise.resolve(3), }); await assertSpyCallAsync(spyMethod, 0, { args: [3, 7], }); await assertSpyCallAsync(spyMethod, 0, { self: point, }); await assertSpyCallAsync(spyMethod, 0, { returned: 3, }); await assertSpyCallAsync(spyMethod, 0, { returned: Promise.resolve(3), });
await assertRejects( () => assertSpyCallAsync(spyMethod, 0, { args: [7, 4], self: undefined, returned: 7, }), AssertionError, "spy not called with expected args", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 0, { args: [7, 3], }), AssertionError, "spy not called with expected args", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 0, { self: undefined, }), AssertionError, "spy not expected to be called as method on object", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 0, { returned: 7, }), AssertionError, "spy call did not resolve to expected value", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 0, { returned: Promise.resolve(7), }), AssertionError, "spy call did not resolve to expected value", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 1), AssertionError, "spy not called as much as expected", );
await spyMethod(9); await assertSpyCallAsync(spyMethod, 1); await assertSpyCallAsync(spyMethod, 1, { args: [9], self: undefined, returned: 9, }); await assertSpyCallAsync(spyMethod, 1, { args: [9], self: undefined, returned: Promise.resolve(9), }); await assertSpyCallAsync(spyMethod, 1, { args: [9], }); await assertSpyCallAsync(spyMethod, 1, { self: undefined, }); await assertSpyCallAsync(spyMethod, 1, { returned: 9, }); await assertSpyCallAsync(spyMethod, 1, { returned: Promise.resolve(9), });
await assertRejects( () => assertSpyCallAsync(spyMethod, 1, { args: [7, 4], self: point, returned: 7, }), AssertionError, "spy not called with expected args", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 1, { args: [7, 3], }), AssertionError, "spy not called with expected args", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 1, { self: point, }), AssertionError, "spy not called as method on expected self", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 1, { returned: 7, }), AssertionError, "spy call did not resolve to expected value", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 1, { returned: Promise.resolve(7), }), AssertionError, "spy call did not resolve to expected value", ); await assertRejects( () => assertSpyCallAsync(spyMethod, 2), AssertionError, "spy not called as much as expected", );});
Deno.test("assertSpyCallAync on sync value", async () => { const spyFunc: Spy<void> = spy(() => 4);
await spyFunc(); await assertRejects( () => assertSpyCallAsync(spyFunc, 0), AssertionError, "spy call did not return a promise, a value was returned.", );});
Deno.test("assertSpyCallAync on sync error", async () => { const spyFunc: Spy<void> = spy(() => { throw new ExampleError("failed"); });
await assertRejects(() => spyFunc(), ExampleError, "fail"); await assertRejects( () => assertSpyCallAsync(spyFunc, 0), AssertionError, "spy call did not return a promise, an error was thrown.", );});
Deno.test("assertSpyCallAync error", async () => { const spyFunc: Spy<void> = spy(() => Promise.reject(new ExampleError("failed")) );
await assertRejects(() => spyFunc(), ExampleError, "fail"); await assertSpyCallAsync(spyFunc, 0); await assertSpyCallAsync(spyFunc, 0, { args: [], self: undefined, error: { Class: ExampleError, msg: "fail", }, }); await assertSpyCallAsync(spyFunc, 0, { args: [], }); await assertSpyCallAsync(spyFunc, 0, { self: undefined, }); await assertSpyCallAsync(spyFunc, 0, { error: { Class: ExampleError, msg: "fail", }, }); await assertSpyCallAsync(spyFunc, 0, { error: { Class: Error, msg: "fail", }, });
await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { args: [1], self: {}, error: { Class: OtherError, msg: "fail", }, }), AssertionError, "spy not called with expected args", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { args: [1], }), AssertionError, "spy not called with expected args", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { self: {}, }), AssertionError, "spy not called as method on expected self", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { error: { Class: OtherError, msg: "fail", }, }), AssertionError, 'Expected error to be instance of "OtherError"', ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { error: { Class: OtherError, msg: "x", }, }), AssertionError, 'Expected error to be instance of "OtherError"', ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { error: { Class: ExampleError, msg: "x", }, }), AssertionError, 'Expected error message to include "x", but got "failed".', ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { error: { Class: Error, msg: "x", }, }), AssertionError, 'Expected error message to include "x", but got "failed".', ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { error: { msg: "x", }, }), AssertionError, 'Expected error message to include "x", but got "failed".', ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { returned: 7, }), AssertionError, "spy call returned promise was rejected", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 0, { returned: 7, error: { msg: "x" }, }), TypeError, "do not expect error and return, only one should be expected", ); await assertRejects( () => assertSpyCallAsync(spyFunc, 1), AssertionError, "spy not called as much as expected", );});
Deno.test("assertSpyArg", () => { const spyFunc: Spy<void> = spy();
assertThrows( () => assertSpyCallArg(spyFunc, 0, 0, undefined), AssertionError, "spy not called as much as expected", );
spyFunc(); assertSpyCallArg(spyFunc, 0, 0, undefined); assertSpyCallArg(spyFunc, 0, 1, undefined); assertThrows( () => assertSpyCallArg(spyFunc, 0, 0, 2), AssertionError, "Values are not equal:", );
spyFunc(7, 9); assertSpyCallArg(spyFunc, 1, 0, 7); assertSpyCallArg(spyFunc, 1, 1, 9); assertSpyCallArg(spyFunc, 1, 2, undefined); assertThrows( () => assertSpyCallArg(spyFunc, 0, 0, 9), AssertionError, "Values are not equal:", ); assertThrows( () => assertSpyCallArg(spyFunc, 0, 1, 7), AssertionError, "Values are not equal:", ); assertThrows( () => assertSpyCallArg(spyFunc, 0, 2, 7), AssertionError, "Values are not equal:", );});
Deno.test("assertSpyArgs without range", () => { const spyFunc: Spy<void> = spy();
assertThrows( () => assertSpyCallArgs(spyFunc, 0, []), AssertionError, "spy not called as much as expected", );
spyFunc(); assertSpyCallArgs(spyFunc, 0, []); assertThrows( () => assertSpyCallArgs(spyFunc, 0, [undefined]), AssertionError, "Values are not equal:", ); assertThrows( () => assertSpyCallArgs(spyFunc, 0, [2]), AssertionError, "Values are not equal:", );
spyFunc(7, 9); assertSpyCallArgs(spyFunc, 1, [7, 9]); assertThrows( () => assertSpyCallArgs(spyFunc, 1, [7, 9, undefined]), AssertionError, "Values are not equal:", ); assertThrows( () => assertSpyCallArgs(spyFunc, 1, [9, 7]), AssertionError, "Values are not equal:", );});
Deno.test("assertSpyArgs with start only", () => { const spyFunc: Spy<void> = spy();
assertThrows( () => assertSpyCallArgs(spyFunc, 0, 1, []), AssertionError, "spy not called as much as expected", );
spyFunc(); assertSpyCallArgs(spyFunc, 0, 1, []); assertThrows( () => assertSpyCallArgs(spyFunc, 0, 1, [undefined]), AssertionError, "Values are not equal:", ); assertThrows( () => assertSpyCallArgs(spyFunc, 0, 1, [2]), AssertionError, "Values are not equal:", );
spyFunc(7, 9, 8); assertSpyCallArgs(spyFunc, 1, 1, [9, 8]); assertThrows( () => assertSpyCallArgs(spyFunc, 1, 1, [9, 8, undefined]), AssertionError, "Values are not equal:", ); assertThrows( () => assertSpyCallArgs(spyFunc, 1, 1, [9, 7]), AssertionError, "Values are not equal:", );});
Deno.test("assertSpyArgs with range", () => { const spyFunc: Spy<void> = spy();
assertThrows( () => assertSpyCallArgs(spyFunc, 0, 1, 3, []), AssertionError, "spy not called as much as expected", );
spyFunc(); assertSpyCallArgs(spyFunc, 0, 1, 3, []); assertThrows( () => assertSpyCallArgs(spyFunc, 0, 1, 3, [undefined, undefined]), AssertionError, "Values are not equal:", ); assertThrows( () => assertSpyCallArgs(spyFunc, 0, 1, 3, [2, 4]), AssertionError, "Values are not equal:", );
spyFunc(7, 9, 8, 5, 6); assertSpyCallArgs(spyFunc, 1, 1, 3, [9, 8]); assertThrows( () => assertSpyCallArgs(spyFunc, 1, 1, 3, [9, 8, undefined]), AssertionError, "Values are not equal:", ); assertThrows( () => assertSpyCallArgs(spyFunc, 1, 1, 3, [9, 7]), AssertionError, "Values are not equal:", );});