Resolve "Remove nose.tools dependency"

Summary

This MR removes nose from the integration tests (related to #23 (closed)).

Focus

Test Environment

Regular integration tests

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tests/test_affiliation.py

@@ -26,11 +26,19 @@
 @author: tf
 """
 import os
-import caosdb as db
-from nose.tools import nottest, assert_equal, assert_is_not_none
+import linkahead as db
+import pytest
 from pytest import raises
 
 
+def assert_equal(a, b):
+    assert a == b
+
+
+def assert_is_not_none(a):
+    assert a is not None
+
+
 def setup_module():
     f = open(file_path, "w")
     f.write("hello, world!")
@@ -218,7 +226,7 @@ def test_file_file_is_invalid():
     assert ee.msg == "Affiliation is not defined for this child-parent constellation."
 
 
-@nottest
+@pytest.mark.skip()
 def test_query_party_example():
     try:
         organisation = db.RecordType(name="Organisation").insert()