add integration test for LP: #1886531

tests/integration_tests/bugs/test_lp1886531.py

@@ -0,0 +1,27 @@
+"""Integration test for LP: #1886531
+
+This test replicates the failure condition (absent /etc/fstab) on all releases
+by removing it in a bootcmd; this runs well before the part of cloud-init which
+causes the failure.
+
+The only required assertion is that cloud-init does not emit a WARNING to the
+log: this indicates that the fstab parsing code has not failed.
+
+https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1886531
+"""
+import pytest
+
+
+USER_DATA = """\
+#cloud-config
+bootcmd:
+- rm /etc/fstab
+"""
+
+
+class TestLp1886531:
+
+    @pytest.mark.user_data(USER_DATA)
+    def test_lp1886531(self, client):
+        log_content = client.read_from_file("/var/log/cloud-init.log")
+        assert "WARNING" not in log_content