Add script to create email tag test cases

As #11 has a number of cases that we want to detect
and possibly handle differently, test cases are needed.

To create them reliably and without we use a script that creates
sql commands. An alternative is have been to go through the
fody-backend, but which would require one more component to run
for building the test cases.

tests/README.md

@@ -1 +1 @@
-To be placed in `intelmq/tests/bots/`.
+`certbund_contact` is to be placed in `intelmq/tests/bots/`.

tests/create_email_tag_cases.py

@@ -0,0 +1,38 @@
+#!/usr/bin/env python3
+"""Create email tag example cases from a list of email addresses.
+
+The convention is that email addresses in the db have been changed
+by prepending an 'x-', so they differ from what the current ripe files have.
+We call them emailA.
+
+When run with ripe_diff the emails coming from the ripe files would be
+imported, thus new, we call them emailB.
+
+Precondition: At least we have tag_id 1 and 2 in the db.
+
+We skip safety checks and ignore style as this is for development. :)
+"""
+import fileinput
+
+def emailB(f):
+    return f.readline().rstrip('\n')
+
+def emailA(f):
+    return 'x-' + emailB(f)
+
+db_lines = []
+
+with fileinput.input() as f:
+    # case 1: both addresses have no tags, we do nothing
+    f.readline()
+
+    # case 2.1.1: emailA is disabled, emailB not
+    db_lines.append("INSERT INTO email_status (email, enabled) VALUES ('{}','{}');".format(emailA(f), "false"))
+
+    # case 2.1.2: emailA has a tag, emailB not
+    db_lines.append("INSERT INTO email_tag (email, tag_id) VALUES ('{}','{}');".format(emailA(f), 1))
+
+    # TODO
+
+for db_line in db_lines:
+    print(db_line)