add docker disk usage tests

src/routes/test/cloudron-test.js

@@ -10,6 +10,8 @@ const constants = require('../../constants.js'),
     expect = require('expect.js'),
     http = require('http'),
     os = require('os'),
+    paths = require('../../paths.js'),
+    safe = require('safetydance'),
     superagent = require('superagent'),
     settings = require('../../settings.js');
 
@@ -382,6 +384,8 @@ describe('Cloudron API', function () {
 
     describe('disk usage', function () {
         it('get succeeds with no cache', async function () {
+            safe.fs.unlinkSync(paths.DISK_USAGE_FILE);
+
             const response = await superagent.get(`${serverUrl}/api/v1/cloudron/disk_usage`)
                 .query({ access_token: owner.token })
                 .send({});
@@ -405,7 +409,17 @@ describe('Cloudron API', function () {
                 .send({});
 
             expect(response.statusCode).to.equal(200);
-            console.log(response.body);
+            expect(response.body.usage.ts).to.be.a('number');
+
+            const filesystems = Object.keys(response.body.usage.disks);
+            let dockerUsage = null;
+            for (const fs of filesystems) {
+                for (const content of response.body.usage.disks[fs].contents) {
+                    if (content.id === 'docker') dockerUsage = content;
+                }
+            }
+            expect(dockerUsage).to.be.ok();
+            expect(dockerUsage.usage).to.be.a('number');
         });
     });