diff --git a/tests/discovery/test_crtsh.py b/tests/discovery/test_crtsh.py
new file mode 100644
index 00000000..20010edd
--- /dev/null
+++ b/tests/discovery/test_crtsh.py
@@ -0,0 +1,77 @@
+import pytest
+
+from theHarvester.discovery import crtsh
+
+
+def _patch_fetch(monkeypatch, payload):
+    import theHarvester.lib.core as core_module
+
+    async def fake_fetch_all(urls, headers=None, proxy=False, json=False):
+        return [payload]
+
+    monkeypatch.setattr(core_module.AsyncFetcher, 'fetch_all', staticmethod(fake_fetch_all), raising=True)
+
+
+class TestCrtshSearch:
+    def test_init_sets_state(self):
+        search = crtsh.SearchCrtsh('example.com')
+        assert search.word == 'example.com'
+        assert search.data == []
+        assert search.proxy is False
+
+    @pytest.mark.asyncio
+    async def test_process_collects_hostnames(self, monkeypatch):
+        _patch_fetch(monkeypatch, [{'name_value': 'www.example.com'}, {'name_value': 'mail.example.com'}])
+        search = crtsh.SearchCrtsh('example.com')
+        await search.process(proxy=True)
+        assert search.proxy is True
+        assert set(await search.get_hostnames()) == {'www.example.com', 'mail.example.com'}
+
+    @pytest.mark.asyncio
+    async def test_wildcard_prefix_is_stripped(self, monkeypatch):
+        _patch_fetch(monkeypatch, [{'name_value': '*.example.com'}])
+        search = crtsh.SearchCrtsh('example.com')
+        await search.process()
+        assert set(await search.get_hostnames()) == {'example.com'}
+
+    @pytest.mark.asyncio
+    async def test_multiline_name_value_is_split(self, monkeypatch):
+        # crt.sh packs several names into one name_value separated by newlines.
+        _patch_fetch(monkeypatch, [{'name_value': 'a.example.com\nb.example.com'}])
+        search = crtsh.SearchCrtsh('example.com')
+        await search.process()
+        assert set(await search.get_hostnames()) == {'a.example.com', 'b.example.com'}
+
+    @pytest.mark.asyncio
+    async def test_numeric_prefixed_entries_are_filtered(self, monkeypatch):
+        _patch_fetch(monkeypatch, [{'name_value': '1234.example.com'}, {'name_value': 'good.example.com'}])
+        search = crtsh.SearchCrtsh('example.com')
+        await search.process()
+        # The numeric-prefixed entry is filtered out, leaving only the valid hostname.
+        assert set(await search.get_hostnames()) == {'good.example.com'}
+
+    @pytest.mark.asyncio
+    async def test_empty_response_returns_no_hostnames(self, monkeypatch):
+        import theHarvester.lib.core as core_module
+
+        async def fake_fetch_all(urls, headers=None, proxy=False, json=False):
+            return []
+
+        monkeypatch.setattr(core_module.AsyncFetcher, 'fetch_all', staticmethod(fake_fetch_all), raising=True)
+        search = crtsh.SearchCrtsh('example.com')
+        await search.process()
+        assert await search.get_hostnames() == []
+
+    @pytest.mark.asyncio
+    async def test_missing_name_value_key_is_handled(self, monkeypatch):
+        _patch_fetch(monkeypatch, [{'issuer_ca_id': 1}])
+        search = crtsh.SearchCrtsh('example.com')
+        await search.process()
+        assert await search.get_hostnames() == []
+
+
+class TestCrtshIntegration:
+    def test_supportedengines_lists_crtsh(self):
+        from theHarvester.lib.core import Core
+
+        assert 'crtsh' in Core.get_supportedengines()