docker.js and services.js: async'ify

src/test/system-test.js

@@ -16,30 +16,19 @@ describe('System', function () {
     before(setup);
     after(cleanup);
 
-    it('can get disks', function (done) {
-        system.getDisks(function (error, disks) {
-            expect(!error).to.be.ok();
-            expect(disks).to.be.ok();
-            done();
-        });
+    it('can get disks', async function () {
+        const disks = await system.getDisks();
+        expect(disks).to.be.ok();
     });
 
-    it('can check for disk space', function (done) {
-        system.checkDiskSpace(function (error) {
-            expect(!error).to.be.ok();
-            done();
-        });
+    it('can check for disk space', async function () {
+        await system.checkDiskSpace();
     });
 
-    it('can get memory', function (done) {
-        system.getMemory(function (error, memory) {
-            expect(!error).to.be.ok();
-
-            expect(memory.memory).to.be.a('number');
-            expect(memory.swap).to.be.a('number');
-
-            done();
-        });
+    it('can get memory', async function () {
+        const memory = await system.getMemory();
+        expect(memory.memory).to.be.a('number');
+        expect(memory.swap).to.be.a('number');
     });
 });