[eric] browser: unit and end-to-end loop tests for the new browser behaviors

backend/tests/test_browser_hints.py

@@ -0,0 +1,36 @@
+"""Per-domain advisory hint store for the browser sub-agent."""
+
+from backend.apps.agents.browser import browser_history as bh
+
+
+def setup_function(_):
+    bh._domain_notes.clear()
+
+
+def test_set_get_roundtrip():
+    bh.set_domain_note("notion.so", "Share button is top-right; Tab into the dialog.")
+    assert "Share button" in bh.get_domain_note("notion.so")
+
+
+def test_caps_length():
+    bh.set_domain_note("x.com", "a" * 5000)
+    assert len(bh.get_domain_note("x.com")) == bh._MAX_DOMAIN_NOTE_CHARS
+
+
+def test_ignores_empty_domain_or_note():
+    bh.set_domain_note("", "note")
+    bh.set_domain_note("y.com", "")
+    bh.set_domain_note("z.com", "   ")
+    assert bh.get_domain_note("") == ""
+    assert bh.get_domain_note("y.com") == ""
+    assert bh.get_domain_note("z.com") == ""
+
+
+def test_unknown_domain_returns_empty():
+    assert bh.get_domain_note("never.seen") == ""
+
+
+def test_overwrite_keeps_latest():
+    bh.set_domain_note("docs.google.com", "first note")
+    bh.set_domain_note("docs.google.com", "second note")
+    assert bh.get_domain_note("docs.google.com") == "second note"