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    <p>Another possibility is to use expectAsync1 function. Working analogue for initial incorrect variant of test would be: </p> <pre class="lang-dart prettyprint-override"><code>void main() { test("testing a future", () { Compute compute = new Compute(); compute.sumIt([1, 2, 3]).then(expectAsync1((Map m) { Expect.equals(true, m.containsKey("value")); Expect.equals(6, m["value"]); })); }); } </code></pre> <p>One advantage in using expectAsync1 for async testing is its composability. Sometimes tests are naturally in need of several sequential async blocks of code. Sample test from mongo_db:</p> <pre class="lang-dart prettyprint-override"><code>testCursorGetMore(){ var res; Db db = new Db('${DefaultUri}mongo_dart-test'); DbCollection collection; int count = 0; Cursor cursor; db.open().chain(expectAsync1((c){ collection = db.collection('new_big_collection2'); collection.remove(); return db.getLastError(); })).chain(expectAsync1((_){ cursor = new Cursor(db,collection,where.limit(10)); return cursor.each((v){ count++; }); })).chain(expectAsync1((dummy){ expect(count,0); List toInsert = new List(); for (int n=0;n &lt; 1000; n++){ toInsert.add({"a":n}); } collection.insertAll(toInsert); return db.getLastError(); })).chain(expectAsync1((_){ cursor = new Cursor(db,collection,where.limit(10)); return cursor.each((v)=&gt;count++); })).then(expectAsync1((v){ expect(count,1000); expect(cursor.cursorId,0); expect(cursor.state,Cursor.CLOSED); collection.remove(); db.close(); })); } </code></pre> <p><strong>Update:</strong> </p> <p>Both Future and unittest API's were changed since question was initially asked. Now it is possible just return <code>Future</code> from test function and unittest properly executed it with all async guarded functionality. Combined with fact that <code>chain</code> and <code>then</code> methods of <code>Future</code> are now merged that provide nice syntax for tests with several sequential blocks of code. In current version of mongo_dart same test looks like: </p> <pre class="lang-dart prettyprint-override"><code>Future testCursorGetMore(){ var res; Db db = new Db('${DefaultUri}mongo_dart-test'); DbCollection collection; int count = 0; Cursor cursor; return db.open().then((c){ collection = db.collection('new_big_collection2'); collection.remove(); return db.getLastError(); }).then((_){ cursor = new Cursor(db,collection,where.limit(10)); return cursor.forEach((v){ count++; }); }).then((dummy){ expect(count,0); List toInsert = new List(); for (int n=0;n &lt; 1000; n++){ toInsert.add({"a":n}); } collection.insertAll(toInsert); return db.getLastError(); }).then((_){ cursor = new Cursor(db,collection,null); return cursor.forEach((v)=&gt;count++); }).then((v){ expect(count,1000); expect(cursor.cursorId,0); expect(cursor.state,State.CLOSED); collection.remove(); return db.close(); }); } </code></pre>
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