test: add test and document that arguments are optional

---
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    status: passed
---

Author: kgryte

lib/node_modules/@stdlib/console/log-each/lib/main.js

@@ -33,7 +33,7 @@ var logger = require( '@stdlib/console/log' );
 * Inserts array element values into a format string and prints the result.
 *
 * @param {string} str - format string
-* @param {...(Collection|*)} args - collections or values
+* @param {...(Collection|*)} [args] - collections or values
 * @throws {TypeError} first argument must be a string
 * @throws {RangeError} provided collections must have the same length
 * @returns {void}

lib/node_modules/@stdlib/console/log-each/test/test.js

@@ -113,6 +113,31 @@ tape( 'the function throws an error if not provided collections with the same le
 	}
 });
 
+tape( 'the function prints a formatted message', function test( t ) {
+	var expected;
+	var logEach;
+	var i;
+	var j;
+
+	logEach = proxyquire( './../lib/main.js', {
+		'@stdlib/console/log': logger
+	});
+
+	j = 0;
+	expected = [ 'foo', 'foo', 'foo' ];
+
+	for ( i = 0; i < expected.length; i++ ) {
+		logEach( 'foo' );
+	}
+	t.strictEqual( j, expected.length, 'returns expected value' );
+	t.end();
+
+	function logger( str ) {
+		t.equal( str, expected[ j ], 'returns expected value' );
+		j += 1;
+	}
+});
+
 tape( 'the function prints a formatted message for each element in an array', function test( t ) {
 	var expected;
 	var logEach;