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website/functions/node_modules/call-me-maybe/test/maybeTest.js

@@ -0,0 +1,137 @@
+"use strict"
+
+var maybe = require("../")
+var assert = require("assert")
+var Promise = global.Promise || require("promise")
+
+describe("maybe", function () {
+  it("should call the callback with result the promise is resolved to", function (done) {
+    var f = function f (cb) {
+      return maybe(cb, new Promise(function (resolve, reject) {
+        process.nextTick(function () {
+          return resolve("hi")
+        })
+      }))
+    }
+
+    f(function (err, result) {
+      assert.ifError(err, "no error")
+      assert.strictEqual(result, "hi")
+      return done()
+    })
+  })
+
+  it("should call the callback with the error the promise is rejected with", function (done) {
+    var f = function f (cb) {
+      return maybe(cb, new Promise(function (resolve, reject) {
+        process.nextTick(function () {
+          return reject(new Error("boom"))
+        })
+      }))
+    }
+
+    f(function (err, result) {
+      assert(err, "we got an error")
+      assert.strictEqual(result, undefined, "we got undefined result")
+      assert(err instanceof Error, "error is an Error")
+      assert.strictEqual(err.message, "boom", "error message is boom")
+      return done()
+    })
+  })
+
+  it("should return undefined when called with a callback", function () {
+    var f = function f (cb) {
+      return maybe(cb, new Promise(function (resolve, reject) {
+        //...
+      }))
+    }
+
+    var returnVal = f(function (err, result) {})
+    assert.strictEqual(returnVal, undefined, "returned val is undefined")
+  })
+
+  it("should return the same promise when no callback is provided", function () {
+    var p
+
+    var f = function f (cb) {
+      p = new Promise(function (resolve, reject) {
+        process.nextTick(function () {
+          return resolve("hi")
+        })
+      })
+      return maybe(cb, p)
+    }
+
+    var returnVal = f()
+    assert(p instanceof Promise, "returned val is a Promise")
+    assert.strictEqual(returnVal, p, "returned val is same obj (not a new Promise)")
+  })
+
+  it("should allow errors thrown in the callback to be uncaught", function (done) {
+    var mochaHandler
+
+    // Temporarily remove Mocha's global error handling so we can
+    // verify error is indeed uncaught by installing our own
+    // global error handler.
+    if (process.browser) {
+      mochaHandler = global.onerror
+      global.onerror = handleUncaughtException
+    }
+    else {
+      mochaHandler = process.listeners("uncaughtException").pop()
+      process.removeListener("uncaughtException", mochaHandler)
+      process.once("uncaughtException", handleUncaughtException)
+    }
+
+    var f = function f (cb) {
+      return maybe(cb, new Promise(function (resolve, reject) {
+        process.nextTick(function () {
+          return resolve("hi")
+        })
+      }))
+    }
+
+    f(function (err, result) {
+      throw new Error("yep")
+    })
+
+    function handleUncaughtException (err) {
+      // `err` is either an Error when running under Node, or a
+      // string if running under a browser.
+      var msg = err.message || err
+
+      assert(msg.match(/\byep\b/), "got expected error")
+
+      // Restore Mocha's global error handler.
+      if (process.browser) {
+        global.onerror = mochaHandler
+      }
+      else {
+        process.on("uncaughtException", mochaHandler)
+      }
+
+      done()
+
+      // Don't leak error to browser console
+      return true
+    }
+  })
+
+  it("should not let the callback be called more than once", function (done) {
+    var f = function f (cb) {
+      return maybe(cb, new Promise(function (resolve, reject) {
+        process.nextTick(function () {
+          resolve("foo")
+        })
+      }))
+    }
+
+    var called = 0
+    f(function (err, result) {
+      called++
+      assert(called <= 1, "called only once")
+      setTimeout(function () { done() }, 100)
+      return Promise.reject(new Error("bah"))
+    })
+  })
+})