Fix some tests

Author: jakajancar

tests/unit/test_jobs.py

@@ -41,7 +41,7 @@ def test_job_get_context(job_factory, scheduled_at, context_scheduled_at):
         "task_kwargs": {"a": "b"},
         "scheduled_at": context_scheduled_at,
         "attempts": 42,
-        "call_string": "mytask[12](a='b')",
+        "call_string": 'mytask[12](a="b")',
         "abort_requested": False,
         "worker_id": None,
     }
@@ -95,4 +95,4 @@ def test_job_scheduled_at_naive(job_factory):
 def test_call_string(job_factory):
     job = job_factory(id=12, task_name="mytask", task_kwargs={"a": "b"})
 
-    assert job.call_string == "mytask[12](a='b')"
+    assert job.call_string == 'mytask[12](a="b")'