Added a test for actually generated codes. Running regular tests 1,000 times...

Added a test for actually generated codes. Running regular tests 1,000 times to get insight into uniqueness limit.

test-generated-codes.coffee

+assert = require 'assert'
+fs = require 'fs'
+
+#
+# Implementation of hash sieve algorithm that I read
+# about at http://www.shamasis.net/2009/09/fast-algorithm-to-find-unique-items-in-javascript-array/
+# in CoffeeScript with slightly more literate code :)
+#
+Array.prototype.unique = ->
+
+    hashSieve = {}
+    arrayOfUniqueValues = [];
+
+    for item in @
+    	hashSieve[item] = item
+
+    for item of hashSieve
+    	arrayOfUniqueValues.push item
+
+    return arrayOfUniqueValues
+
+#
+# Test that codes really are unique.
+#
+
+a = JSON.parse(fs.readFileSync('codes/1414632363426/tier-100.json'))
+b = JSON.parse(fs.readFileSync('codes/1414632363426/tier-1000.json'))
+
+c = a.concat b
+
+c = c.unique()
+
+assert.equal c.length, a.length + b.length, 'Codes should be unique across both tiers'
+
+console.log 'All codes are unique across the $100 and $1,000 tiers.'
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test.coffee

@@ -23,19 +23,25 @@ Array.prototype.unique = ->
 # Test that codes really are unique.
 #
 codeGenerator = new CodeGenerator()
-codes = codeGenerator.generateUniqueCodes(1000)
-codes = codes.unique()
 
-assert.equal codes.length, 1000, 'There should be 1,000 unique codes.'
+numCodes = 10000
+numTimes = 1000
+
+while numTimes
+	process.stdout.write 'Running test #' + numTimes + '          \r'
+	codes = codeGenerator.generateUniqueCodes(numCodes)
+	codes = codes.unique()
+
+	assert.equal codes.length, numCodes, 'There should be ' + numCodes + ' unique codes.'
+	numTimes--
 
 #
 # And that our hash sieve is working :)
 #
-codes[0] = 'Hello'
-codes[1] = 'Hello'
-
-codes = codes.unique()
+testArray =['hello', 'there', 'hello', 'again']
+testArray = testArray.unique()
 
-assert.equal codes.length, 999, 'There should be 999 unique codes.'
+assert.equal testArray.length, 3, 'There should be 3 items.'
+assert.equal testArray[2], 'again', 'Third item should be “again”'
 
-console.log 'TESTS OK.'
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+console.log '\nTESTS OK.'
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