Fix throws assertions rejecting falsy values when any: true

Fixes #3312

Author: gibson042

lib/assert.js

@@ -417,6 +417,7 @@ export class Assertions {
 			}
 
 			let retval;
+			let threw = false;
 			let actual = null;
 			try {
 				retval = fn();
@@ -429,10 +430,11 @@ export class Assertions {
 					}));
 				}
 			} catch (error) {
+				threw = true;
 				actual = error;
 			}
 
-			if (!actual) {
+			if (!threw) {
 				throw fail(new AssertionError(message, {
 					assertion: 't.throws()',
 					formattedDetails: [formatWithLabel('Function returned:', retval)],

test-tap/assert.js

@@ -882,11 +882,16 @@ test('.throws()', gather(t => {
 		throw new Error('foo');
 	}), {expectBoolean: false});
 
-	// Passes when string is thrown, only when any is set to true.
+	// Passes when string is thrown and `expectation.any` is true.
 	passes(t, () => assertions.throws(() => {
 		throw 'foo'; // eslint-disable-line no-throw-literal
 	}, {any: true}), {expectBoolean: false});
 
+	// Passes when false is thrown and `expectation.any` is true.
+	passes(t, () => assertions.throws(() => {
+		throw false; // eslint-disable-line no-throw-literal
+	}, {any: true}), {expectBoolean: false});
+
 	// Passes because the correct error is thrown.
 	passes(t, () => {
 		const error = new Error('foo');
@@ -1098,9 +1103,12 @@ test('.throwsAsync()', gather(t => {
 	// Passes because the promise was rejected with an error.
 	throwsAsyncPasses(t, () => assertions.throwsAsync(Promise.reject(new Error())));
 
-	// Passes because the promise was rejected with an with an non-error exception, & set `any` to true in expectation.
+	// Passes because the promise was rejected with a non-error reason and `expectation.any` is true.
 	throwsAsyncPasses(t, () => assertions.throwsAsync(Promise.reject('foo'), {any: true})); // eslint-disable-line prefer-promise-reject-errors
 
+	// Passes because the promise was rejected with a falsy non-error reason and `expectation.any` is true.
+	throwsAsyncPasses(t, () => assertions.throwsAsync(Promise.reject(), {any: true}));
+
 	// Passes because the function returned a promise rejected with an error.
 	throwsAsyncPasses(t, () => assertions.throwsAsync(() => Promise.reject(new Error())));