test: add file utilities tests

- Add tests for file processing constraints and validators
- Add tests for FileProcessor and FileResolver
- Add tests for resolved file types
- Add tests for file store operations
- Add unit tests for multimodal LLM support

lib/crewai/tests/utilities/test_file_store.py

@@ -0,0 +1,171 @@
+"""Unit tests for file_store module."""
+
+import uuid
+
+import pytest
+
+from crewai.utilities.file_store import (
+    clear_files,
+    clear_task_files,
+    get_all_files,
+    get_files,
+    get_task_files,
+    store_files,
+    store_task_files,
+)
+from crewai.utilities.files import TextFile
+
+
+class TestFileStore:
+    """Tests for synchronous file store operations."""
+
+    def setup_method(self) -> None:
+        """Set up test fixtures."""
+        self.crew_id = uuid.uuid4()
+        self.task_id = uuid.uuid4()
+        self.test_file = TextFile(source=b"test content")
+
+    def teardown_method(self) -> None:
+        """Clean up after tests."""
+        clear_files(self.crew_id)
+        clear_task_files(self.task_id)
+
+    def test_store_and_get_files(self) -> None:
+        """Test storing and retrieving crew files."""
+        files = {"doc": self.test_file}
+        store_files(self.crew_id, files)
+
+        retrieved = get_files(self.crew_id)
+
+        assert retrieved is not None
+        assert "doc" in retrieved
+        assert retrieved["doc"].read() == b"test content"
+
+    def test_get_files_returns_none_when_empty(self) -> None:
+        """Test that get_files returns None for non-existent keys."""
+        new_id = uuid.uuid4()
+        result = get_files(new_id)
+        assert result is None
+
+    def test_clear_files(self) -> None:
+        """Test clearing crew files."""
+        files = {"doc": self.test_file}
+        store_files(self.crew_id, files)
+
+        clear_files(self.crew_id)
+
+        result = get_files(self.crew_id)
+        assert result is None
+
+    def test_store_and_get_task_files(self) -> None:
+        """Test storing and retrieving task files."""
+        files = {"task_doc": self.test_file}
+        store_task_files(self.task_id, files)
+
+        retrieved = get_task_files(self.task_id)
+
+        assert retrieved is not None
+        assert "task_doc" in retrieved
+
+    def test_clear_task_files(self) -> None:
+        """Test clearing task files."""
+        files = {"task_doc": self.test_file}
+        store_task_files(self.task_id, files)
+
+        clear_task_files(self.task_id)
+
+        result = get_task_files(self.task_id)
+        assert result is None
+
+    def test_get_all_files_merges_crew_and_task(self) -> None:
+        """Test that get_all_files merges crew and task files."""
+        crew_file = TextFile(source=b"crew content")
+        task_file = TextFile(source=b"task content")
+
+        store_files(self.crew_id, {"crew_doc": crew_file})
+        store_task_files(self.task_id, {"task_doc": task_file})
+
+        merged = get_all_files(self.crew_id, self.task_id)
+
+        assert merged is not None
+        assert "crew_doc" in merged
+        assert "task_doc" in merged
+
+    def test_get_all_files_task_overrides_crew(self) -> None:
+        """Test that task files override crew files with same name."""
+        crew_file = TextFile(source=b"crew version")
+        task_file = TextFile(source=b"task version")
+
+        store_files(self.crew_id, {"shared_doc": crew_file})
+        store_task_files(self.task_id, {"shared_doc": task_file})
+
+        merged = get_all_files(self.crew_id, self.task_id)
+
+        assert merged is not None
+        assert merged["shared_doc"].read() == b"task version"
+
+    def test_get_all_files_crew_only(self) -> None:
+        """Test get_all_files with only crew files."""
+        store_files(self.crew_id, {"doc": self.test_file})
+
+        result = get_all_files(self.crew_id)
+
+        assert result is not None
+        assert "doc" in result
+
+    def test_get_all_files_returns_none_when_empty(self) -> None:
+        """Test that get_all_files returns None when no files exist."""
+        new_crew_id = uuid.uuid4()
+        new_task_id = uuid.uuid4()
+
+        result = get_all_files(new_crew_id, new_task_id)
+
+        assert result is None
+
+
+@pytest.mark.asyncio
+class TestAsyncFileStore:
+    """Tests for asynchronous file store operations."""
+
+    async def test_astore_and_aget_files(self) -> None:
+        """Test async storing and retrieving crew files."""
+        from crewai.utilities.file_store import aclear_files, aget_files, astore_files
+
+        crew_id = uuid.uuid4()
+        test_file = TextFile(source=b"async content")
+
+        try:
+            await astore_files(crew_id, {"doc": test_file})
+            retrieved = await aget_files(crew_id)
+
+            assert retrieved is not None
+            assert "doc" in retrieved
+            assert retrieved["doc"].read() == b"async content"
+        finally:
+            await aclear_files(crew_id)
+
+    async def test_aget_all_files(self) -> None:
+        """Test async get_all_files merging."""
+        from crewai.utilities.file_store import (
+            aclear_files,
+            aclear_task_files,
+            aget_all_files,
+            astore_files,
+            astore_task_files,
+        )
+
+        crew_id = uuid.uuid4()
+        task_id = uuid.uuid4()
+
+        try:
+            await astore_files(crew_id, {"crew": TextFile(source=b"crew")})
+            await astore_task_files(task_id, {"task": TextFile(source=b"task")})
+
+            merged = await aget_all_files(crew_id, task_id)
+
+            assert merged is not None
+            assert "crew" in merged
+            assert "task" in merged
+        finally:
+            await aclear_files(crew_id)
+            await aclear_task_files(task_id)