diff --git a/lib/core/error-correction-code.js b/lib/core/error-correction-code.js
index 7a4aeae..5f2fceb 100755
--- a/lib/core/error-correction-code.js
+++ b/lib/core/error-correction-code.js
@@ -1,135 +1,135 @@
-const ECLevel = require('./error-correction-level')
-
-const EC_BLOCKS_TABLE = [
-// L  M  Q  H
-  1, 1, 1, 1,
-  1, 1, 1, 1,
-  1, 1, 2, 2,
-  1, 2, 2, 4,
-  1, 2, 4, 4,
-  2, 4, 4, 4,
-  2, 4, 6, 5,
-  2, 4, 6, 6,
-  2, 5, 8, 8,
-  4, 5, 8, 8,
-  4, 5, 8, 11,
-  4, 8, 10, 11,
-  4, 9, 12, 16,
-  4, 9, 16, 16,
-  6, 10, 12, 18,
-  6, 10, 17, 16,
-  6, 11, 16, 19,
-  6, 13, 18, 21,
-  7, 14, 21, 25,
-  8, 16, 20, 25,
-  8, 17, 23, 25,
-  9, 17, 23, 34,
-  9, 18, 25, 30,
-  10, 20, 27, 32,
-  12, 21, 29, 35,
-  12, 23, 34, 37,
-  12, 25, 34, 40,
-  13, 26, 35, 42,
-  14, 28, 38, 45,
-  15, 29, 40, 48,
-  16, 31, 43, 51,
-  17, 33, 45, 54,
-  18, 35, 48, 57,
-  19, 37, 51, 60,
-  19, 38, 53, 63,
-  20, 40, 56, 66,
-  21, 43, 59, 70,
-  22, 45, 62, 74,
-  24, 47, 65, 77,
-  25, 49, 68, 81
-]
-
-const EC_CODEWORDS_TABLE = [
-// L  M  Q  H
-  7, 10, 13, 17,
-  10, 16, 22, 28,
-  15, 26, 36, 44,
-  20, 36, 52, 64,
-  26, 48, 72, 88,
-  36, 64, 96, 112,
-  40, 72, 108, 130,
-  48, 88, 132, 156,
-  60, 110, 160, 192,
-  72, 130, 192, 224,
-  80, 150, 224, 264,
-  96, 176, 260, 308,
-  104, 198, 288, 352,
-  120, 216, 320, 384,
-  132, 240, 360, 432,
-  144, 280, 408, 480,
-  168, 308, 448, 532,
-  180, 338, 504, 588,
-  196, 364, 546, 650,
-  224, 416, 600, 700,
-  224, 442, 644, 750,
-  252, 476, 690, 816,
-  270, 504, 750, 900,
-  300, 560, 810, 960,
-  312, 588, 870, 1050,
-  336, 644, 952, 1110,
-  360, 700, 1020, 1200,
-  390, 728, 1050, 1260,
-  420, 784, 1140, 1350,
-  450, 812, 1200, 1440,
-  480, 868, 1290, 1530,
-  510, 924, 1350, 1620,
-  540, 980, 1440, 1710,
-  570, 1036, 1530, 1800,
-  570, 1064, 1590, 1890,
-  600, 1120, 1680, 1980,
-  630, 1204, 1770, 2100,
-  660, 1260, 1860, 2220,
-  720, 1316, 1950, 2310,
-  750, 1372, 2040, 2430
-]
-
-/**
- * Returns the number of error correction block that the QR Code should contain
- * for the specified version and error correction level.
- *
- * @param  {Number} version              QR Code version
- * @param  {Number} errorCorrectionLevel Error correction level
- * @return {Number}                      Number of error correction blocks
- */
-exports.getBlocksCount = function getBlocksCount (version, errorCorrectionLevel) {
-  switch (errorCorrectionLevel) {
-    case ECLevel.L:
-      return EC_BLOCKS_TABLE[(version - 1) * 4 + 0]
-    case ECLevel.M:
-      return EC_BLOCKS_TABLE[(version - 1) * 4 + 1]
-    case ECLevel.Q:
-      return EC_BLOCKS_TABLE[(version - 1) * 4 + 2]
-    case ECLevel.H:
-      return EC_BLOCKS_TABLE[(version - 1) * 4 + 3]
-    default:
-      return undefined
-  }
-}
-
-/**
- * Returns the number of error correction codewords to use for the specified
- * version and error correction level.
- *
- * @param  {Number} version              QR Code version
- * @param  {Number} errorCorrectionLevel Error correction level
- * @return {Number}                      Number of error correction codewords
- */
-exports.getTotalCodewordsCount = function getTotalCodewordsCount (version, errorCorrectionLevel) {
-  switch (errorCorrectionLevel) {
-    case ECLevel.L:
-      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 0]
-    case ECLevel.M:
-      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 1]
-    case ECLevel.Q:
-      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 2]
-    case ECLevel.H:
-      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 3]
-    default:
-      return undefined
-  }
-}
+const ECLevel = require('./error-correction-level')
+
+const EC_BLOCKS_TABLE = [
+// L  M  Q  H
+  1, 1, 1, 1,
+  1, 1, 1, 1,
+  1, 1, 2, 2,
+  1, 2, 2, 4,
+  1, 2, 4, 4,
+  2, 4, 4, 4,
+  2, 4, 6, 5,
+  2, 4, 6, 6,
+  2, 5, 8, 8,
+  4, 5, 8, 8,
+  4, 5, 8, 11,
+  4, 8, 10, 11,
+  4, 9, 12, 16,
+  4, 9, 16, 16,
+  6, 10, 12, 18,
+  6, 10, 17, 16,
+  6, 11, 16, 19,
+  6, 13, 18, 21,
+  7, 14, 21, 25,
+  8, 16, 20, 25,
+  8, 17, 23, 25,
+  9, 17, 23, 34,
+  9, 18, 25, 30,
+  10, 20, 27, 32,
+  12, 21, 29, 35,
+  12, 23, 34, 37,
+  12, 25, 34, 40,
+  13, 26, 35, 42,
+  14, 28, 38, 45,
+  15, 29, 40, 48,
+  16, 31, 43, 51,
+  17, 33, 45, 54,
+  18, 35, 48, 57,
+  19, 37, 51, 60,
+  19, 38, 53, 63,
+  20, 40, 56, 66,
+  21, 43, 59, 70,
+  22, 45, 62, 74,
+  24, 47, 65, 77,
+  25, 49, 68, 81
+]
+
+const EC_CODEWORDS_TABLE = [
+// L  M  Q  H
+  7, 10, 13, 17,
+  10, 16, 22, 28,
+  15, 26, 36, 44,
+  20, 36, 52, 64,
+  26, 48, 72, 88,
+  36, 64, 96, 112,
+  40, 72, 108, 130,
+  48, 88, 132, 156,
+  60, 110, 160, 192,
+  72, 130, 192, 224,
+  80, 150, 224, 264,
+  96, 176, 260, 308,
+  104, 198, 288, 352,
+  120, 216, 320, 384,
+  132, 240, 360, 432,
+  144, 280, 408, 480,
+  168, 308, 448, 532,
+  180, 338, 504, 588,
+  196, 364, 546, 650,
+  224, 416, 600, 700,
+  224, 442, 644, 750,
+  252, 476, 690, 816,
+  270, 504, 750, 900,
+  300, 560, 810, 960,
+  312, 588, 870, 1050,
+  336, 644, 952, 1110,
+  360, 700, 1020, 1200,
+  390, 728, 1050, 1260,
+  420, 784, 1140, 1350,
+  450, 812, 1200, 1440,
+  480, 868, 1290, 1530,
+  510, 924, 1350, 1620,
+  540, 980, 1440, 1710,
+  570, 1036, 1530, 1800,
+  570, 1064, 1590, 1890,
+  600, 1120, 1680, 1980,
+  630, 1204, 1770, 2100,
+  660, 1260, 1860, 2220,
+  720, 1316, 1950, 2310,
+  750, 1372, 2040, 2430
+]
+
+/**
+ * Returns the number of error correction block that the QR Code should contain
+ * for the specified version and error correction level.
+ *
+ * @param  {Number} version              QR Code version
+ * @param  {Number} errorCorrectionLevel Error correction level
+ * @return {Number}                      Number of error correction blocks
+ */
+exports.getBlocksCount = function getBlocksCount (version, errorCorrectionLevel) {
+  switch (errorCorrectionLevel) {
+    case ECLevel.L:
+      return EC_BLOCKS_TABLE[(version - 1) * 4 + 0]
+    case ECLevel.M:
+      return EC_BLOCKS_TABLE[(version - 1) * 4 + 1]
+    case ECLevel.Q:
+      return EC_BLOCKS_TABLE[(version - 1) * 4 + 2]
+    case ECLevel.H:
+      return EC_BLOCKS_TABLE[(version - 1) * 4 + 3]
+    default:
+      return undefined
+  }
+}
+
+/**
+ * Returns the number of error correction codewords to use for the specified
+ * version and error correction level.
+ *
+ * @param  {Number} version              QR Code version
+ * @param  {Number} errorCorrectionLevel Error correction level
+ * @return {Number}                      Number of error correction codewords
+ */
+exports.getTotalCodewordsCount = function getTotalCodewordsCount (version, errorCorrectionLevel) {
+  switch (errorCorrectionLevel) {
+    case ECLevel.L:
+      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 0]
+    case ECLevel.M:
+      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 1]
+    case ECLevel.Q:
+      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 2]
+    case ECLevel.H:
+      return EC_CODEWORDS_TABLE[(version - 1) * 4 + 3]
+    default:
+      return undefined
+  }
+}
diff --git a/test/unit/core/mask-pattern.test.js b/test/unit/core/mask-pattern.test.js
index 40fc501..32a6fc0 100755
--- a/test/unit/core/mask-pattern.test.js
+++ b/test/unit/core/mask-pattern.test.js
@@ -1,291 +1,291 @@
-const test = require('tap').test
-const BitMatrix = require('core/bit-matrix')
-const MaskPattern = require('core/mask-pattern')
-
-test('Mask pattern - Pattern references', function (t) {
-  const patternsCount = Object.keys(MaskPattern.Patterns).length
-  t.equal(patternsCount, 8, 'Should return 8 patterns')
-
-  t.end()
-})
-
-const expectedPattern000 = [
-  1, 0, 1, 0, 1, 0,
-  0, 1, 0, 1, 0, 1,
-  1, 0, 1, 0, 1, 0,
-  0, 1, 0, 1, 0, 1,
-  1, 0, 1, 0, 1, 0,
-  0, 1, 0, 1, 0, 1
-]
-
-const expectedPattern001 = [
-  1, 1, 1, 1, 1, 1,
-  0, 0, 0, 0, 0, 0,
-  1, 1, 1, 1, 1, 1,
-  0, 0, 0, 0, 0, 0,
-  1, 1, 1, 1, 1, 1,
-  0, 0, 0, 0, 0, 0
-]
-
-const expectedPattern010 = [
-  1, 0, 0, 1, 0, 0,
-  1, 0, 0, 1, 0, 0,
-  1, 0, 0, 1, 0, 0,
-  1, 0, 0, 1, 0, 0,
-  1, 0, 0, 1, 0, 0,
-  1, 0, 0, 1, 0, 0
-]
-
-const expectedPattern011 = [
-  1, 0, 0, 1, 0, 0,
-  0, 0, 1, 0, 0, 1,
-  0, 1, 0, 0, 1, 0,
-  1, 0, 0, 1, 0, 0,
-  0, 0, 1, 0, 0, 1,
-  0, 1, 0, 0, 1, 0
-]
-
-const expectedPattern100 = [
-  1, 1, 1, 0, 0, 0,
-  1, 1, 1, 0, 0, 0,
-  0, 0, 0, 1, 1, 1,
-  0, 0, 0, 1, 1, 1,
-  1, 1, 1, 0, 0, 0,
-  1, 1, 1, 0, 0, 0
-]
-
-const expectedPattern101 = [
-  1, 1, 1, 1, 1, 1,
-  1, 0, 0, 0, 0, 0,
-  1, 0, 0, 1, 0, 0,
-  1, 0, 1, 0, 1, 0,
-  1, 0, 0, 1, 0, 0,
-  1, 0, 0, 0, 0, 0
-]
-
-const expectedPattern110 = [
-  1, 1, 1, 1, 1, 1,
-  1, 1, 1, 0, 0, 0,
-  1, 1, 0, 1, 1, 0,
-  1, 0, 1, 0, 1, 0,
-  1, 0, 1, 1, 0, 1,
-  1, 0, 0, 0, 1, 1
-]
-
-const expectedPattern111 = [
-  1, 0, 1, 0, 1, 0,
-  0, 0, 0, 1, 1, 1,
-  1, 0, 0, 0, 1, 1,
-  0, 1, 0, 1, 0, 1,
-  1, 1, 1, 0, 0, 0,
-  0, 1, 1, 1, 0, 0
-]
-
-test('MaskPattern validity', function (t) {
-  t.notOk(MaskPattern.isValid(), 'Should return false if no input')
-  t.notOk(MaskPattern.isValid(''), 'Should return false if value is not a number')
-  t.notOk(MaskPattern.isValid(-1), 'Should return false if value is not in range')
-  t.notOk(MaskPattern.isValid(8), 'Should return false if value is not in range')
-
-  t.end()
-})
-
-test('MaskPattern from value', function (t) {
-  t.equal(MaskPattern.from(5), 5, 'Should return correct mask pattern from a number')
-  t.equal(MaskPattern.from('5'), 5, 'Should return correct mask pattern from a string')
-  t.equal(MaskPattern.from(-1), undefined, 'Should return undefined if value is invalid')
-  t.equal(MaskPattern.from(null), undefined, 'Should return undefined if value is null')
-
-  t.end()
-})
-
-test('Mask pattern - Apply mask', function (t) {
-  const patterns = Object.keys(MaskPattern.Patterns).length
-  const expectedPatterns = [
-    expectedPattern000, expectedPattern001, expectedPattern010, expectedPattern011,
-    expectedPattern100, expectedPattern101, expectedPattern110, expectedPattern111
-  ]
-
-  for (let p = 0; p < patterns; p++) {
-    const matrix = new BitMatrix(6)
-    MaskPattern.applyMask(p, matrix)
-    t.same(matrix.data, new Uint8Array(expectedPatterns[p]), 'Should return correct pattern')
-  }
-
-  const matrix = new BitMatrix(2)
-  matrix.set(0, 0, false, true)
-  matrix.set(0, 1, false, true)
-  matrix.set(1, 0, false, true)
-  matrix.set(1, 1, false, true)
-  MaskPattern.applyMask(0, matrix)
-
-  t.same(matrix.data, new Uint8Array([false, false, false, false]), 'Should leave reserved bit unchanged')
-
-  t.throws(function () { MaskPattern.applyMask(-1, new BitMatrix(1)) }, 'Should throw if pattern is invalid')
-
-  t.end()
-})
-
-test('Mask pattern - Penalty N1', function (t) {
-  let matrix = new BitMatrix(11)
-  matrix.data = [
-    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1,
-    1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
-    0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1,
-    1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
-    1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0,
-    1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
-    1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
-    1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1,
-    0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1
-  ]
-
-  t.equal(MaskPattern.getPenaltyN1(matrix), 59,
-    'Should return correct penalty points')
-
-  matrix = new BitMatrix(6)
-  matrix.data = expectedPattern000
-
-  t.equal(MaskPattern.getPenaltyN1(matrix), 0,
-    'Should return correct penalty points')
-
-  matrix.data = expectedPattern001
-
-  t.equal(MaskPattern.getPenaltyN1(matrix), 24,
-    'Should return correct penalty points')
-
-  matrix.data = expectedPattern010
-
-  t.equal(MaskPattern.getPenaltyN1(matrix), 24,
-    'Should return correct penalty points')
-
-  matrix.data = expectedPattern101
-
-  t.equal(MaskPattern.getPenaltyN1(matrix), 20,
-    'Should return correct penalty points')
-
-  t.end()
-})
-
-test('Mask pattern - Penalty N2', function (t) {
-  let matrix = new BitMatrix(8)
-  matrix.data = [
-    1, 1, 1, 1, 1, 1, 1, 1,
-    1, 1, 1, 0, 0, 0, 1, 1,
-    0, 1, 1, 1, 0, 0, 1, 1,
-    1, 0, 0, 0, 1, 1, 0, 1,
-    0, 0, 0, 0, 0, 0, 0, 0,
-    1, 0, 1, 1, 0, 0, 0, 0,
-    1, 1, 1, 1, 1, 0, 0, 0,
-    1, 1, 0, 0, 1, 0, 1, 1
-  ]
-
-  t.equal(MaskPattern.getPenaltyN2(matrix), 45,
-    'Should return correct penalty points')
-
-  matrix = new BitMatrix(6)
-  matrix.data = expectedPattern000
-
-  t.equal(MaskPattern.getPenaltyN2(matrix), 0,
-    'Should return correct penalty points')
-
-  matrix.data = expectedPattern010
-
-  t.equal(MaskPattern.getPenaltyN2(matrix), 30,
-    'Should return correct penalty points')
-
-  matrix.data = expectedPattern100
-
-  t.equal(MaskPattern.getPenaltyN2(matrix), 36,
-    'Should return correct penalty points')
-
-  t.end()
-})
-
-test('Mask pattern - Penalty N3', function (t) {
-  const matrix = new BitMatrix(11)
-  matrix.data = [
-    0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1,
-    0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1,
-    0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1,
-    0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
-    1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1,
-    0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1,
-    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1,
-    1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0,
-    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0
-  ]
-
-  t.equal(MaskPattern.getPenaltyN3(matrix), 160,
-    'Should return correct penalty points')
-
-  matrix.data = [
-    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
-    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
-    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
-    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
-    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1,
-    1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0,
-    0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1,
-    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1,
-    0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1,
-    1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0,
-    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1
-  ]
-
-  t.equal(MaskPattern.getPenaltyN3(matrix), 280,
-    'Should return correct penalty points')
-
-  t.end()
-})
-
-test('Mask pattern - Penalty N4', function (t) {
-  const matrix = new BitMatrix(10)
-  matrix.data = new Array(50).fill(1).concat(new Array(50).fill(0))
-
-  t.equal(MaskPattern.getPenaltyN4(matrix), 0,
-    'Should return correct penalty points')
-
-  const matrix2 = new BitMatrix(21)
-  matrix2.data = new Array(190).fill(1).concat(new Array(251).fill(0))
-
-  t.equal(MaskPattern.getPenaltyN4(matrix2), 10,
-    'Should return correct penalty points')
-
-  const matrix3 = new BitMatrix(10)
-  matrix3.data = new Array(22).fill(1).concat(new Array(78).fill(0))
-
-  t.equal(MaskPattern.getPenaltyN4(matrix3), 50,
-    'Should return correct penalty points')
-
-  t.end()
-})
-
-test('Mask pattern - Best mask', function (t) {
-  const matrix = new BitMatrix(11)
-  matrix.data = [
-    0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1,
-    0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1,
-    0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1,
-    0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1,
-    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
-    1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1,
-    0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1,
-    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
-    0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1,
-    1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0,
-    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0
-  ]
-
-  const mask = MaskPattern.getBestMask(matrix, function () {})
-  t.ok(!isNaN(mask), 'Should return a number')
-
-  t.ok(mask >= 0 && mask < 8,
-    'Should return a number in range 0,7')
-
-  t.end()
-})
+const test = require('tap').test
+const BitMatrix = require('core/bit-matrix')
+const MaskPattern = require('core/mask-pattern')
+
+test('Mask pattern - Pattern references', function (t) {
+  const patternsCount = Object.keys(MaskPattern.Patterns).length
+  t.equal(patternsCount, 8, 'Should return 8 patterns')
+
+  t.end()
+})
+
+const expectedPattern000 = [
+  1, 0, 1, 0, 1, 0,
+  0, 1, 0, 1, 0, 1,
+  1, 0, 1, 0, 1, 0,
+  0, 1, 0, 1, 0, 1,
+  1, 0, 1, 0, 1, 0,
+  0, 1, 0, 1, 0, 1
+]
+
+const expectedPattern001 = [
+  1, 1, 1, 1, 1, 1,
+  0, 0, 0, 0, 0, 0,
+  1, 1, 1, 1, 1, 1,
+  0, 0, 0, 0, 0, 0,
+  1, 1, 1, 1, 1, 1,
+  0, 0, 0, 0, 0, 0
+]
+
+const expectedPattern010 = [
+  1, 0, 0, 1, 0, 0,
+  1, 0, 0, 1, 0, 0,
+  1, 0, 0, 1, 0, 0,
+  1, 0, 0, 1, 0, 0,
+  1, 0, 0, 1, 0, 0,
+  1, 0, 0, 1, 0, 0
+]
+
+const expectedPattern011 = [
+  1, 0, 0, 1, 0, 0,
+  0, 0, 1, 0, 0, 1,
+  0, 1, 0, 0, 1, 0,
+  1, 0, 0, 1, 0, 0,
+  0, 0, 1, 0, 0, 1,
+  0, 1, 0, 0, 1, 0
+]
+
+const expectedPattern100 = [
+  1, 1, 1, 0, 0, 0,
+  1, 1, 1, 0, 0, 0,
+  0, 0, 0, 1, 1, 1,
+  0, 0, 0, 1, 1, 1,
+  1, 1, 1, 0, 0, 0,
+  1, 1, 1, 0, 0, 0
+]
+
+const expectedPattern101 = [
+  1, 1, 1, 1, 1, 1,
+  1, 0, 0, 0, 0, 0,
+  1, 0, 0, 1, 0, 0,
+  1, 0, 1, 0, 1, 0,
+  1, 0, 0, 1, 0, 0,
+  1, 0, 0, 0, 0, 0
+]
+
+const expectedPattern110 = [
+  1, 1, 1, 1, 1, 1,
+  1, 1, 1, 0, 0, 0,
+  1, 1, 0, 1, 1, 0,
+  1, 0, 1, 0, 1, 0,
+  1, 0, 1, 1, 0, 1,
+  1, 0, 0, 0, 1, 1
+]
+
+const expectedPattern111 = [
+  1, 0, 1, 0, 1, 0,
+  0, 0, 0, 1, 1, 1,
+  1, 0, 0, 0, 1, 1,
+  0, 1, 0, 1, 0, 1,
+  1, 1, 1, 0, 0, 0,
+  0, 1, 1, 1, 0, 0
+]
+
+test('MaskPattern validity', function (t) {
+  t.notOk(MaskPattern.isValid(), 'Should return false if no input')
+  t.notOk(MaskPattern.isValid(''), 'Should return false if value is not a number')
+  t.notOk(MaskPattern.isValid(-1), 'Should return false if value is not in range')
+  t.notOk(MaskPattern.isValid(8), 'Should return false if value is not in range')
+
+  t.end()
+})
+
+test('MaskPattern from value', function (t) {
+  t.equal(MaskPattern.from(5), 5, 'Should return correct mask pattern from a number')
+  t.equal(MaskPattern.from('5'), 5, 'Should return correct mask pattern from a string')
+  t.equal(MaskPattern.from(-1), undefined, 'Should return undefined if value is invalid')
+  t.equal(MaskPattern.from(null), undefined, 'Should return undefined if value is null')
+
+  t.end()
+})
+
+test('Mask pattern - Apply mask', function (t) {
+  const patterns = Object.keys(MaskPattern.Patterns).length
+  const expectedPatterns = [
+    expectedPattern000, expectedPattern001, expectedPattern010, expectedPattern011,
+    expectedPattern100, expectedPattern101, expectedPattern110, expectedPattern111
+  ]
+
+  for (let p = 0; p < patterns; p++) {
+    const matrix = new BitMatrix(6)
+    MaskPattern.applyMask(p, matrix)
+    t.same(matrix.data, new Uint8Array(expectedPatterns[p]), 'Should return correct pattern')
+  }
+
+  const matrix = new BitMatrix(2)
+  matrix.set(0, 0, false, true)
+  matrix.set(0, 1, false, true)
+  matrix.set(1, 0, false, true)
+  matrix.set(1, 1, false, true)
+  MaskPattern.applyMask(0, matrix)
+
+  t.same(matrix.data, new Uint8Array([false, false, false, false]), 'Should leave reserved bit unchanged')
+
+  t.throws(function () { MaskPattern.applyMask(-1, new BitMatrix(1)) }, 'Should throw if pattern is invalid')
+
+  t.end()
+})
+
+test('Mask pattern - Penalty N1', function (t) {
+  let matrix = new BitMatrix(11)
+  matrix.data = [
+    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1,
+    1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
+    0, 1, 1, 1, 0, 0, 1, 1, 1, 1, 1,
+    1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
+    1, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0,
+    1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,
+    1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1,
+    1, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1,
+    0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 1
+  ]
+
+  t.equal(MaskPattern.getPenaltyN1(matrix), 59,
+    'Should return correct penalty points')
+
+  matrix = new BitMatrix(6)
+  matrix.data = expectedPattern000
+
+  t.equal(MaskPattern.getPenaltyN1(matrix), 0,
+    'Should return correct penalty points')
+
+  matrix.data = expectedPattern001
+
+  t.equal(MaskPattern.getPenaltyN1(matrix), 24,
+    'Should return correct penalty points')
+
+  matrix.data = expectedPattern010
+
+  t.equal(MaskPattern.getPenaltyN1(matrix), 24,
+    'Should return correct penalty points')
+
+  matrix.data = expectedPattern101
+
+  t.equal(MaskPattern.getPenaltyN1(matrix), 20,
+    'Should return correct penalty points')
+
+  t.end()
+})
+
+test('Mask pattern - Penalty N2', function (t) {
+  let matrix = new BitMatrix(8)
+  matrix.data = [
+    1, 1, 1, 1, 1, 1, 1, 1,
+    1, 1, 1, 0, 0, 0, 1, 1,
+    0, 1, 1, 1, 0, 0, 1, 1,
+    1, 0, 0, 0, 1, 1, 0, 1,
+    0, 0, 0, 0, 0, 0, 0, 0,
+    1, 0, 1, 1, 0, 0, 0, 0,
+    1, 1, 1, 1, 1, 0, 0, 0,
+    1, 1, 0, 0, 1, 0, 1, 1
+  ]
+
+  t.equal(MaskPattern.getPenaltyN2(matrix), 45,
+    'Should return correct penalty points')
+
+  matrix = new BitMatrix(6)
+  matrix.data = expectedPattern000
+
+  t.equal(MaskPattern.getPenaltyN2(matrix), 0,
+    'Should return correct penalty points')
+
+  matrix.data = expectedPattern010
+
+  t.equal(MaskPattern.getPenaltyN2(matrix), 30,
+    'Should return correct penalty points')
+
+  matrix.data = expectedPattern100
+
+  t.equal(MaskPattern.getPenaltyN2(matrix), 36,
+    'Should return correct penalty points')
+
+  t.end()
+})
+
+test('Mask pattern - Penalty N3', function (t) {
+  const matrix = new BitMatrix(11)
+  matrix.data = [
+    0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1,
+    0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1,
+    0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1,
+    0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
+    1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1,
+    0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1,
+    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1,
+    1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0,
+    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0
+  ]
+
+  t.equal(MaskPattern.getPenaltyN3(matrix), 160,
+    'Should return correct penalty points')
+
+  matrix.data = [
+    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
+    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
+    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
+    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
+    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1,
+    1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 0,
+    0, 1, 1, 1, 0, 1, 1, 1, 0, 0, 1,
+    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1,
+    0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 1,
+    1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0,
+    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1
+  ]
+
+  t.equal(MaskPattern.getPenaltyN3(matrix), 280,
+    'Should return correct penalty points')
+
+  t.end()
+})
+
+test('Mask pattern - Penalty N4', function (t) {
+  const matrix = new BitMatrix(10)
+  matrix.data = new Array(50).fill(1).concat(new Array(50).fill(0))
+
+  t.equal(MaskPattern.getPenaltyN4(matrix), 0,
+    'Should return correct penalty points')
+
+  const matrix2 = new BitMatrix(21)
+  matrix2.data = new Array(190).fill(1).concat(new Array(251).fill(0))
+
+  t.equal(MaskPattern.getPenaltyN4(matrix2), 10,
+    'Should return correct penalty points')
+
+  const matrix3 = new BitMatrix(10)
+  matrix3.data = new Array(22).fill(1).concat(new Array(78).fill(0))
+
+  t.equal(MaskPattern.getPenaltyN4(matrix3), 50,
+    'Should return correct penalty points')
+
+  t.end()
+})
+
+test('Mask pattern - Best mask', function (t) {
+  const matrix = new BitMatrix(11)
+  matrix.data = [
+    0, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1,
+    0, 0, 0, 0, 1, 0, 1, 1, 1, 0, 1,
+    0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 1,
+    0, 1, 1, 1, 1, 1, 0, 0, 1, 1, 1,
+    1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,
+    1, 0, 1, 0, 0, 0, 1, 1, 1, 1, 1,
+    0, 1, 1, 1, 0, 0, 1, 1, 0, 0, 1,
+    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 1,
+    1, 0, 1, 1, 0, 0, 0, 1, 1, 1, 0,
+    1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0
+  ]
+
+  const mask = MaskPattern.getBestMask(matrix, function () {})
+  t.ok(!isNaN(mask), 'Should return a number')
+
+  t.ok(mask >= 0 && mask < 8,
+    'Should return a number in range 0,7')
+
+  t.end()
+})