Make t.log() behave more like console.log()

index.js.flow

@@ -84,7 +84,7 @@ type TestContext = AssertContext & {
 	title: string;
 	plan(count: number): void;
 	skip: AssertContext;
-	log(message: string): void;
+	log(...values: Array<any>): void;
 };
 type ContextualTestContext         = TestContext & { context: any; };
 type ContextualCallbackTestContext = TestContext & { context: any; end(): void; };

lib/assert.js

@@ -130,8 +130,16 @@ function wrapAssertions(callbacks) {
 			}
 		},
 
-		log(text) {
-			log(this, text);
+		log() {
+			const args = Array.from(arguments, value => {
+				return typeof value === 'string' ?
+					value :
+					concordance.format(value, concordanceOptions);
+			});
+
+			if (args.length > 0) {
+				log(this, args.join(' '));
+			}
 		},
 
 		deepEqual(actual, expected, message) {

readme.md

@@ -890,9 +890,9 @@ Plan how many assertion there are in the test. The test will fail if the actual
 
 End the test. Only works with `test.cb()`.
 
-###### `t.log(message)`
+###### `t.log(...values)`
 
-Print a log message contextually alongside the test result instead of immediately printing it to `stdout` like `console.log`.
+Log values contextually alongside the test result instead of immediately printing them to `stdout`. Behaves somewhat like `console.log`, but without support for placeholder tokens.
 
 ## Assertions
 

test/flow-types/log.js.flow

@@ -0,0 +1,8 @@
+/* @flow */
+
+const test = require('../../index.js.flow');
+
+test('log', t => {
+	t.pass();
+	t.log({object: true}, 42, ['array'], false, new Date(), new Map());
+})

test/test.js

@@ -741,13 +741,19 @@ test('log from tests', t => {
 		a.log('a log message from a test');
 		t.true(true);
 		a.log('another log message from a test');
+		a.log({b: 1, c: {d: 2}}, 'complex log', 5, 5.1);
+		a.log();
 	}, null, r => {
 		result = r;
 	}).run();
 
 	t.deepEqual(
 		result.result.logs,
-		['a log message from a test', 'another log message from a test']
+		[
+			'a log message from a test',
+			'another log message from a test',
+			'{\n  b: 1,\n  c: {\n    d: 2,\n  },\n} complex log 5 5.1'
+		]
 	);
 
 	t.end();

types/base.d.ts

@@ -104,9 +104,9 @@ export interface TestContext extends AssertContext {
 
 	skip: AssertContext;
 	/**
-	 * Print a log message contextually alongside the test result instead of immediately printing it to stdout like console.log.
+	 * Log values contextually alongside the test result instead of immediately printing them to `stdout`.
 	 */
-	log(message: string): void;
+	log(...values: any[]): void;
 }
 export interface CallbackTestContext extends TestContext {
 	/**