Added demonstrateBias() function for testing purposes.

tests/lib.js

@@ -0,0 +1,38 @@
+
+/**
+* Return an array with max values, where each value is the number of times
+* the remainer was that of the index.  This is used to show bias in a 
+* particular dividend.
+*
+* Based on code at https://github.com/dmuth/diceware/issues/7
+*/
+function demonstrateBias(max) {
+
+	var map = new Array(max);
+
+	for (var i = 0; i < max; i++) {
+		map[i] = 0;
+	}
+  
+	//
+	// Go through all possible values (note that any power of 2 
+	// should work, instead of 256...) and increment map by one for each 
+	// remainder we get across that set.
+	//
+	for (var i = 0; i < 256; i++) {
+		map[i % max]++;
+	}
+
+	//
+	// All of the values in this should be equal.  If not, there's bias!
+	//
+	return map;
+
+} // End of demonstrateBias()
+
+
+//console.log(demonstrateBias(4));
+//console.log(demonstrateBias(5));
+//console.log(demonstrateBias(6));
+//console.log(demonstrateBias(8));
+