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node_modules/lop/test/lazy-iterators.test.js

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+var lazyIterators = require("../lib/lazy-iterators");
+
+exports.convertingArrayToIteratorAndBack = function(test) {
+    var original = ["apple", "banana", "coconut"];
+    var iterator = lazyIterators.fromArray(original);
+    var reconstituted = iterator.toArray();
+    test.deepEqual(original, reconstituted);
+    test.done();
+};
+
+exports.mapAppliesFunctionToEveryElement = function(test) {
+    var original = [1, 2, 3];
+    var squared = lazyIterators.fromArray(original).map(function(i) {
+        return i * i;
+    }).toArray();
+    test.deepEqual([1, 4, 9], squared);
+    test.done();
+};
+
+exports.mappingFunctionIsOnlyCalledWhenNecessary = function(test) {
+    var original = [1, 2, 3];
+    var faultySquared = lazyIterators.fromArray(original).map(function(i) {
+        if (i === 1) {
+            return i;
+        } else {
+            throw new Error("Can only calculate the square of one");
+        }
+    }).first();
+    test.deepEqual(1, faultySquared);
+    test.done();
+};
+
+exports.filterRetainsElementsThatSatisfyPredicate = function(test) {
+    var original = [1, 2, 3, 4];
+    var even = lazyIterators.fromArray(original).filter(function(i) {
+        return i % 2 === 0;
+    }).toArray();
+    test.deepEqual([2, 4], even);
+    test.done();
+};
+
+exports.firstReturnsFirstElementOfArray = function(test) {
+    var original = [1, 2, 3, 4];
+    var first = lazyIterators.fromArray(original).first();
+    test.deepEqual(1, first);
+    test.done();
+};
+
+exports.firstIsNullIfArrayIsEmpty = function(test) {
+    var first = lazyIterators.fromArray([]).first();
+    test.same(null, first);
+    test.done();
+};