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node_modules/backoff/tests/fibonacci_backoff_strategy.js

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+/*
+ * Copyright (c) 2012 Mathieu Turcotte
+ * Licensed under the MIT license.
+ */
+
+var sinon = require('sinon');
+
+var FibonacciBackoffStrategy = require('../lib/strategy/fibonacci');
+
+exports["FibonacciBackoffStrategy"] = {
+    setUp: function(callback) {
+        this.strategy = new FibonacciBackoffStrategy({
+            initialDelay: 10,
+            maxDelay: 1000
+        });
+        callback();
+    },
+
+    "backoff delays should follow a Fibonacci sequence": function(test) {
+        // Fibonacci sequence: x[i] = x[i-1] + x[i-2].
+        var expectedDelays = [10, 10, 20, 30, 50, 80, 130, 210, 340, 550, 890, 1000];
+        var actualDelays = [];
+
+        for (var i = 0; i < expectedDelays.length; i++) {
+            actualDelays.push(this.strategy.next());
+        }
+
+        test.deepEqual(expectedDelays, actualDelays,
+            'Generated delays should follow a Fibonacci sequence.');
+        test.done();
+    },
+
+    "backoff delays should restart from the initial delay after reset": function(test) {
+        var strategy = new FibonacciBackoffStrategy({
+            initialDelay: 10,
+            maxDelay: 1000
+        });
+
+        strategy.next();
+        strategy.reset();
+
+        var backoffDelay = strategy.next();
+        test.equals(backoffDelay, 10,
+            'Strategy should return the initial delay after reset.');
+        test.done();
+    }
+};