Make spec'ed tests stable across runs

This was preventing us from running tests in parallel, since the names were changing

test/specs.py

@@ -2,7 +2,6 @@ import json
 import hashlib
 
 from flask import url_for
-from uuid import uuid4
 from base64 import b64encode
 
 
@@ -27,19 +26,19 @@ ORG_OWNERS = 'owners'
 ORG_READERS = 'readers'
 
 FAKE_MANIFEST = 'unknown_tag'
-FAKE_DIGEST = 'sha256:' + hashlib.sha256(str(uuid4())).hexdigest()
-FAKE_IMAGE_ID = str(uuid4())
-FAKE_UPLOAD_ID = str(uuid4())
-FAKE_TAG_NAME = str(uuid4())
-FAKE_USERNAME = str(uuid4())
-FAKE_TOKEN = str(uuid4())
-FAKE_WEBHOOK = str(uuid4())
+FAKE_DIGEST = 'sha256:' + hashlib.sha256('fake').hexdigest()
+FAKE_IMAGE_ID = 'fake-image'
+FAKE_UPLOAD_ID = 'fake-upload'
+FAKE_TAG_NAME = 'fake-tag'
+FAKE_USERNAME = 'fakeuser'
+FAKE_TOKEN = 'fake-token'
+FAKE_WEBHOOK = 'fake-webhook'
 
 BUILD_UUID = '123'
 TRIGGER_UUID = '123'
 
 NEW_ORG_REPO_DETAILS = {
-  'repository': str(uuid4()),
+  'repository': 'fake-repository',
   'visibility': 'private',
   'description': '',
   'namespace': ORG,
@@ -69,7 +68,7 @@ CHANGE_PERMISSION_DETAILS = {
 }
 
 CREATE_BUILD_DETAILS = {
-  'file_id': str(uuid4()),
+  'file_id': 'fake-file-id',
 }
 
 CHANGE_VISIBILITY_DETAILS = {