return swap listing in the disk route

src/test/system-test.js

@@ -22,7 +22,16 @@ describe('System', function () {
 
         const disks = await system.getDisks();
         expect(disks).to.be.ok();
-        expect(disks.some(d => d.mountpoint === '/')).to.be.ok();
+        expect(Object.keys(disks).some(fs => disks[fs].mountpoint === '/')).to.be.ok();
+    });
+
+    it('can get swaps', async function () {
+        // does not work on archlinux 8!
+        if (require('child_process').execSync('uname -a').toString().indexOf('-arch') !== -1) return;
+
+        const swaps = await system.getSwaps();
+        expect(swaps).to.be.ok();
+        expect(Object.keys(swaps).some(n => swaps[n].type === 'partition')).to.be.ok();
     });
 
     it('can check for disk space', async function () {