--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/unit/test_plugin_xep_0373.py	Tue Sep 20 16:22:18 2022 +0200
@@ -0,0 +1,146 @@
+from datetime import datetime, timedelta, timezone
+from sat.plugins.plugin_xep_0373 import XEP_0373, NS_OX
+from sat.tools.xmpp_datetime import parse_datetime
+
+import pytest
+from twisted.words.protocols.jabber import jid
+
+
+a = jid.JID("foo@example.com")
+b = jid.JID("bar@example.com")
+
+
+def test_signcrypt_element_args() -> None:
+    with pytest.raises(ValueError):
+        XEP_0373.build_signcrypt_element([])
+
+
+def test_signcrypt_element() -> None:
+    signcrypt_elt, payload_elt = XEP_0373.build_signcrypt_element([ a, b ])
+    payload_elt.addElement("signcrypt-test-content", content="signcrypt test content")
+
+    rpad_elt = next(signcrypt_elt.elements(NS_OX, "rpad"))
+    time_elt = next(signcrypt_elt.elements(NS_OX, "time"))
+
+    rpad = str(rpad_elt)
+    timestamp = parse_datetime(time_elt["stamp"])
+
+    signcrypt_elt.children.remove(rpad_elt)
+    signcrypt_elt.children.remove(time_elt)
+
+    assert rpad
+    assert (datetime.now(timezone.utc) - timestamp) < timedelta(seconds=10)
+    assert signcrypt_elt.toXml() == (
+        "<signcrypt xmlns='urn:xmpp:openpgp:0'>"
+            "<to jid='foo@example.com'/>"
+            "<to jid='bar@example.com'/>"
+            "<payload>"
+                "<signcrypt-test-content>signcrypt test content</signcrypt-test-content>"
+            "</payload>"
+        "</signcrypt>"
+    )
+
+
+def test_sign_element_args() -> None:
+    with pytest.raises(ValueError):
+        XEP_0373.build_sign_element([], True)
+
+
+def test_sign_element_with_rpad() -> None:
+    sign_elt, payload_elt = XEP_0373.build_sign_element([ a, b ], True)
+    payload_elt.addElement("sign-test-content", content="sign test content")
+
+    rpad_elt = next(sign_elt.elements(NS_OX, "rpad"))
+    time_elt = next(sign_elt.elements(NS_OX, "time"))
+
+    rpad = str(rpad_elt)
+    timestamp = parse_datetime(time_elt["stamp"])
+
+    sign_elt.children.remove(rpad_elt)
+    sign_elt.children.remove(time_elt)
+
+    assert rpad
+    assert (datetime.now(timezone.utc) - timestamp) < timedelta(seconds=10)
+    assert sign_elt.toXml() == (
+        "<sign xmlns='urn:xmpp:openpgp:0'>"
+            "<to jid='foo@example.com'/>"
+            "<to jid='bar@example.com'/>"
+            "<payload>"
+                "<sign-test-content>sign test content</sign-test-content>"
+            "</payload>"
+        "</sign>"
+    )
+
+
+def test_sign_element_without_rpad() -> None:
+    sign_elt, payload_elt = XEP_0373.build_sign_element([ a, b ], False)
+    payload_elt.addElement("sign-test-content", content="sign test content")
+
+    rpad_elt = next(sign_elt.elements(NS_OX, "rpad"), None)
+    time_elt = next(sign_elt.elements(NS_OX, "time"))
+
+    timestamp = parse_datetime(time_elt["stamp"])
+
+    sign_elt.children.remove(time_elt)
+
+    assert rpad_elt is None
+    assert (datetime.now(timezone.utc) - timestamp) < timedelta(seconds=10)
+    assert sign_elt.toXml() == (
+        "<sign xmlns='urn:xmpp:openpgp:0'>"
+            "<to jid='foo@example.com'/>"
+            "<to jid='bar@example.com'/>"
+            "<payload>"
+                "<sign-test-content>sign test content</sign-test-content>"
+            "</payload>"
+        "</sign>"
+    )
+
+
+def test_crypt_element_with_recipients() -> None:
+    crypt_elt, payload_elt = XEP_0373.build_crypt_element([ a, b ])
+    payload_elt.addElement("crypt-test-content", content="crypt test content")
+
+    rpad_elt = next(crypt_elt.elements(NS_OX, "rpad"))
+    time_elt = next(crypt_elt.elements(NS_OX, "time"))
+
+    rpad = str(rpad_elt)
+    timestamp = parse_datetime(time_elt["stamp"])
+
+    crypt_elt.children.remove(rpad_elt)
+    crypt_elt.children.remove(time_elt)
+
+    assert rpad
+    assert (datetime.now(timezone.utc) - timestamp) < timedelta(seconds=10)
+    assert crypt_elt.toXml() == (
+        "<crypt xmlns='urn:xmpp:openpgp:0'>"
+            "<to jid='foo@example.com'/>"
+            "<to jid='bar@example.com'/>"
+            "<payload>"
+                "<crypt-test-content>crypt test content</crypt-test-content>"
+            "</payload>"
+        "</crypt>"
+    )
+
+
+def test_crypt_element_without_recipients() -> None:
+    crypt_elt, payload_elt = XEP_0373.build_crypt_element([])
+    payload_elt.addElement("crypt-test-content", content="crypt test content")
+
+    rpad_elt = next(crypt_elt.elements(NS_OX, "rpad"))
+    time_elt = next(crypt_elt.elements(NS_OX, "time"))
+
+    rpad = str(rpad_elt)
+    timestamp = parse_datetime(time_elt["stamp"])
+
+    crypt_elt.children.remove(rpad_elt)
+    crypt_elt.children.remove(time_elt)
+
+    assert rpad
+    assert (datetime.now(timezone.utc) - timestamp) < timedelta(seconds=10)
+    assert crypt_elt.toXml() == (
+        "<crypt xmlns='urn:xmpp:openpgp:0'>"
+            "<payload>"
+                "<crypt-test-content>crypt test content</crypt-test-content>"
+            "</payload>"
+        "</crypt>"
+    )