test: add unit tests for 8 modules (batch 2)

Cover model_tools, toolset_distributions, context_compressor,
prompt_caching, cronjob_tools, session_search, process_registry,
and cron/scheduler with 127 new test cases.

tests/tools/test_session_search.py

@@ -0,0 +1,147 @@
+"""Tests for tools/session_search_tool.py — helper functions and search dispatcher."""
+
+import json
+import time
+import pytest
+
+from tools.session_search_tool import (
+    _format_timestamp,
+    _format_conversation,
+    _truncate_around_matches,
+    MAX_SESSION_CHARS,
+)
+
+
+# =========================================================================
+# _format_timestamp
+# =========================================================================
+
+class TestFormatTimestamp:
+    def test_unix_float(self):
+        ts = 1700000000.0  # Nov 14, 2023
+        result = _format_timestamp(ts)
+        assert "2023" in result or "November" in result
+
+    def test_unix_int(self):
+        result = _format_timestamp(1700000000)
+        assert isinstance(result, str)
+        assert len(result) > 5
+
+    def test_iso_string(self):
+        result = _format_timestamp("2024-01-15T10:30:00")
+        assert isinstance(result, str)
+
+    def test_none_returns_unknown(self):
+        assert _format_timestamp(None) == "unknown"
+
+    def test_numeric_string(self):
+        result = _format_timestamp("1700000000.0")
+        assert isinstance(result, str)
+        assert "unknown" not in result.lower()
+
+
+# =========================================================================
+# _format_conversation
+# =========================================================================
+
+class TestFormatConversation:
+    def test_basic_messages(self):
+        msgs = [
+            {"role": "user", "content": "Hello"},
+            {"role": "assistant", "content": "Hi there!"},
+        ]
+        result = _format_conversation(msgs)
+        assert "[USER]: Hello" in result
+        assert "[ASSISTANT]: Hi there!" in result
+
+    def test_tool_message(self):
+        msgs = [
+            {"role": "tool", "content": "search results", "tool_name": "web_search"},
+        ]
+        result = _format_conversation(msgs)
+        assert "[TOOL:web_search]" in result
+
+    def test_long_tool_output_truncated(self):
+        msgs = [
+            {"role": "tool", "content": "x" * 1000, "tool_name": "terminal"},
+        ]
+        result = _format_conversation(msgs)
+        assert "[truncated]" in result
+
+    def test_assistant_with_tool_calls(self):
+        msgs = [
+            {
+                "role": "assistant",
+                "content": "",
+                "tool_calls": [
+                    {"function": {"name": "web_search"}},
+                    {"function": {"name": "terminal"}},
+                ],
+            },
+        ]
+        result = _format_conversation(msgs)
+        assert "web_search" in result
+        assert "terminal" in result
+
+    def test_empty_messages(self):
+        result = _format_conversation([])
+        assert result == ""
+
+
+# =========================================================================
+# _truncate_around_matches
+# =========================================================================
+
+class TestTruncateAroundMatches:
+    def test_short_text_unchanged(self):
+        text = "Short text about docker"
+        result = _truncate_around_matches(text, "docker")
+        assert result == text
+
+    def test_long_text_truncated(self):
+        # Create text longer than MAX_SESSION_CHARS with query term in middle
+        padding = "x" * (MAX_SESSION_CHARS + 5000)
+        text = padding + " KEYWORD_HERE " + padding
+        result = _truncate_around_matches(text, "KEYWORD_HERE")
+        assert len(result) <= MAX_SESSION_CHARS + 100  # +100 for prefix/suffix markers
+        assert "KEYWORD_HERE" in result
+
+    def test_truncation_adds_markers(self):
+        text = "a" * 50000 + " target " + "b" * (MAX_SESSION_CHARS + 5000)
+        result = _truncate_around_matches(text, "target")
+        assert "truncated" in result.lower()
+
+    def test_no_match_takes_from_start(self):
+        text = "x" * (MAX_SESSION_CHARS + 5000)
+        result = _truncate_around_matches(text, "nonexistent")
+        # Should take from the beginning
+        assert result.startswith("x")
+
+    def test_match_at_beginning(self):
+        text = "KEYWORD " + "x" * (MAX_SESSION_CHARS + 5000)
+        result = _truncate_around_matches(text, "KEYWORD")
+        assert "KEYWORD" in result
+
+
+# =========================================================================
+# session_search (dispatcher)
+# =========================================================================
+
+class TestSessionSearch:
+    def test_no_db_returns_error(self):
+        from tools.session_search_tool import session_search
+        result = json.loads(session_search(query="test"))
+        assert result["success"] is False
+        assert "not available" in result["error"].lower()
+
+    def test_empty_query_returns_error(self):
+        from tools.session_search_tool import session_search
+        mock_db = object()
+        result = json.loads(session_search(query="", db=mock_db))
+        assert result["success"] is False
+
+    def test_whitespace_query_returns_error(self):
+        from tools.session_search_tool import session_search
+        mock_db = object()
+        result = json.loads(session_search(query="   ", db=mock_db))
+        assert result["success"] is False