diff --git a/shellhist/tests/test_search.py b/shellhist/tests/test_search.py
index bcc743d..d68fbe5 100644
--- a/shellhist/tests/test_search.py
+++ b/shellhist/tests/test_search.py
@@ -8,7 +8,7 @@ from shellhist.core.search import fuzzy_search, rank_by_frequency
 class TestFuzzySearch:
     """Test fuzzy search functionality."""
 
-    def setup_method(self):
+    def setup_method(self) -> None:
         """Set up test fixtures."""
         self.store = HistoryStore()
         
@@ -29,32 +29,32 @@ class TestFuzzySearch:
             entry = HistoryEntry(command=cmd, line_number=i)
             self.store.add_entry(entry)
 
-    def test_basic_search(self):
+    def test_basic_search(self) -> None:
         """Test basic fuzzy search."""
         results = fuzzy_search(self.store, "git status", threshold=50)
         
         assert len(results) > 0
         assert any(r[0].command == "git status" for r in results)
 
-    def test_search_with_threshold(self):
+    def test_search_with_threshold(self) -> None:
         """Test search with custom threshold."""
         results = fuzzy_search(self.store, "git commit message", threshold=80)
         
         assert all(r[1] >= 80 for r in results)
 
-    def test_search_no_match(self):
+    def test_search_no_match(self) -> None:
         """Test search with no matches."""
         results = fuzzy_search(self.store, "xyz123nonexistent", threshold=70)
         
         assert len(results) == 0
 
-    def test_search_limit(self):
+    def test_search_limit(self) -> None:
         """Test search result limit."""
         results = fuzzy_search(self.store, "git", threshold=50, limit=3)
         
         assert len(results) <= 3
 
-    def test_search_reverse_sort(self):
+    def test_search_reverse_sort(self) -> None:
         """Test search with reverse sorting."""
         results_normal = fuzzy_search(self.store, "git", threshold=50, reverse=False)
         results_reverse = fuzzy_search(self.store, "git", threshold=50, reverse=True)
@@ -62,7 +62,7 @@ class TestFuzzySearch:
         if len(results_normal) > 1:
             assert results_normal != results_reverse
 
-    def test_search_recent_boost(self):
+    def test_search_recent_boost(self) -> None:
         """Test that recent commands get boosted."""
         from datetime import datetime, timedelta
         
@@ -92,7 +92,7 @@ class TestFuzzySearch:
 class TestRankByFrequency:
     """Test frequency ranking functionality."""
 
-    def setup_method(self):
+    def setup_method(self) -> None:
         """Set up test fixtures."""
         self.store = HistoryStore()
         
@@ -104,7 +104,7 @@ class TestRankByFrequency:
         
         self.store.add_entry(HistoryEntry(command="ls"))
 
-    def test_rank_by_frequency(self):
+    def test_rank_by_frequency(self) -> None:
         """Test ranking results by frequency."""
         entry = HistoryEntry(command="git status")
         results = [(entry, 100)]
@@ -114,7 +114,7 @@ class TestRankByFrequency:
         assert len(ranked) == 1
         assert ranked[0][2] == 5
 
-    def test_rank_multiple(self):
+    def test_rank_multiple(self) -> None:
         """Test ranking multiple results."""
         entry1 = HistoryEntry(command="git status")
         entry2 = HistoryEntry(command="git log")