fix

book/node_modules/lunr/test/vector_test.js

@@ -0,0 +1,64 @@
+module("lunr.Vector")
+
+test("calculating the magnitude of a vector", function () {
+  var vector = new lunr.Vector,
+      elements = [4,5,6]
+
+  elements.forEach(function (el, i) { vector.insert(i, el) })
+
+  equal(vector.magnitude(), Math.sqrt(77))
+})
+
+test("calculating the dot product with another vector", function () {
+  var v1 = new lunr.Vector,
+      v2 = new lunr.Vector,
+      els1 = [1, 3, -5],
+      els2 = [4, -2, -1]
+
+
+  els1.forEach(function (el, i) { v1.insert(i, el) })
+  els2.forEach(function (el, i) { v2.insert(i, el) })
+
+  equal(v1.dot(v2), 3)
+})
+
+test("calculating the similarity between two vectors", function () {
+  var v1 = new lunr.Vector,
+      v2 = new lunr.Vector,
+      els1 = [1, 3, -5],
+      els2 = [4, -2, -1]
+
+  els1.forEach(function (el, i) { v1.insert(i, el) })
+  els2.forEach(function (el, i) { v2.insert(i, el) })
+
+  var similarity = v1.similarity(v2),
+      roundedSimilarity = Math.round(similarity * 1000) / 1000
+
+  equal(roundedSimilarity, 0.111)
+})
+
+test("inserting an element invalidates the magnitude cache", function () {
+  var vector = new lunr.Vector,
+      elements = [4,5,6]
+
+  elements.forEach(function (el, i) { vector.insert(i, el) })
+
+  equal(vector.magnitude(), Math.sqrt(77))
+
+  vector.insert(3, 7)
+
+  equal(vector.magnitude(), Math.sqrt(126))
+})
+
+test("inserted elements are kept in index order", function () {
+  var vector = new lunr.Vector,
+      elements = [6,5,4]
+
+  vector.insert(2, 4)
+  vector.insert(1, 5)
+  vector.insert(0, 6)
+
+  equal(vector.list.idx, 0)
+  equal(vector.list.next.idx, 1)
+  equal(vector.list.next.next.idx, 2)
+})