diff --git a/tests/unit/test_decoding/__init__.py b/tests/unit/test_decoding/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/unit/test_decoding/test_mistral_ocr_processor.py b/tests/unit/test_decoding/test_mistral_ocr_processor.py
new file mode 100644
index 00000000..cb8362b7
--- /dev/null
+++ b/tests/unit/test_decoding/test_mistral_ocr_processor.py
@@ -0,0 +1,296 @@
+"""
+Unit tests for trustgraph.decoding.mistral_ocr.processor
+"""
+
+import pytest
+import base64
+import uuid
+from unittest.mock import AsyncMock, MagicMock, patch, Mock
+from unittest import IsolatedAsyncioTestCase
+from io import BytesIO
+
+from trustgraph.decoding.mistral_ocr.processor import Processor
+from trustgraph.schema import Document, TextDocument, Metadata
+
+
+class TestMistralOcrProcessor(IsolatedAsyncioTestCase):
+    """Test Mistral OCR processor functionality"""
+
+    @patch('trustgraph.decoding.mistral_ocr.processor.Mistral')
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_processor_initialization_with_api_key(self, mock_flow_init, mock_mistral_class):
+        """Test Mistral OCR processor initialization with API key"""
+        # Arrange
+        mock_flow_init.return_value = None
+        mock_mistral = MagicMock()
+        mock_mistral_class.return_value = mock_mistral
+        
+        config = {
+            'id': 'test-mistral-ocr',
+            'api_key': 'test-api-key',
+            'taskgroup': AsyncMock()
+        }
+
+        # Act
+        with patch.object(Processor, 'register_specification') as mock_register:
+            processor = Processor(**config)
+
+        # Assert
+        mock_flow_init.assert_called_once()
+        mock_mistral_class.assert_called_once_with(api_key='test-api-key')
+        
+        # Verify register_specification was called twice (consumer and producer)
+        assert mock_register.call_count == 2
+        
+        # Check consumer spec
+        consumer_call = mock_register.call_args_list[0]
+        consumer_spec = consumer_call[0][0]
+        assert consumer_spec.name == "input"
+        assert consumer_spec.schema == Document
+        assert consumer_spec.handler == processor.on_message
+        
+        # Check producer spec
+        producer_call = mock_register.call_args_list[1]
+        producer_spec = producer_call[0][0]
+        assert producer_spec.name == "output"
+        assert producer_spec.schema == TextDocument
+
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_processor_initialization_without_api_key(self, mock_flow_init):
+        """Test Mistral OCR processor initialization without API key raises error"""
+        # Arrange
+        mock_flow_init.return_value = None
+        
+        config = {
+            'id': 'test-mistral-ocr',
+            'taskgroup': AsyncMock()
+        }
+
+        # Act & Assert
+        with patch.object(Processor, 'register_specification'):
+            with pytest.raises(RuntimeError, match="Mistral API key not specified"):
+                processor = Processor(**config)
+
+    @patch('trustgraph.decoding.mistral_ocr.processor.uuid.uuid4')
+    @patch('trustgraph.decoding.mistral_ocr.processor.Mistral')
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_ocr_single_chunk(self, mock_flow_init, mock_mistral_class, mock_uuid):
+        """Test OCR processing with a single chunk (less than 5 pages)"""
+        # Arrange
+        mock_flow_init.return_value = None
+        mock_uuid.return_value = "test-uuid-1234"
+        
+        # Mock Mistral client
+        mock_mistral = MagicMock()
+        mock_mistral_class.return_value = mock_mistral
+        
+        # Mock file upload
+        mock_uploaded_file = MagicMock(id="file-123")
+        mock_mistral.files.upload.return_value = mock_uploaded_file
+        
+        # Mock signed URL
+        mock_signed_url = MagicMock(url="https://example.com/signed-url")
+        mock_mistral.files.get_signed_url.return_value = mock_signed_url
+        
+        # Mock OCR response
+        mock_page = MagicMock(
+            markdown="# Page 1\nContent ![img1](img1)",
+            images=[MagicMock(id="img1", image_base64="data:image/png;base64,abc123")]
+        )
+        mock_ocr_response = MagicMock(pages=[mock_page])
+        mock_mistral.ocr.process.return_value = mock_ocr_response
+        
+        # Mock PyPDF
+        mock_pdf_reader = MagicMock()
+        mock_pdf_reader.pages = [MagicMock(), MagicMock(), MagicMock()]  # 3 pages
+        
+        config = {
+            'id': 'test-mistral-ocr',
+            'api_key': 'test-api-key',
+            'taskgroup': AsyncMock()
+        }
+
+        with patch.object(Processor, 'register_specification'):
+            with patch('trustgraph.decoding.mistral_ocr.processor.PdfReader', return_value=mock_pdf_reader):
+                with patch('trustgraph.decoding.mistral_ocr.processor.PdfWriter') as mock_pdf_writer_class:
+                    mock_pdf_writer = MagicMock()
+                    mock_pdf_writer_class.return_value = mock_pdf_writer
+                    
+                    processor = Processor(**config)
+                    
+                    # Act
+                    result = processor.ocr(b"fake pdf content")
+
+        # Assert
+        assert result == "# Page 1\nContent ![img1](data:image/png;base64,abc123)"
+        
+        # Verify PDF writer was used to create chunk
+        assert mock_pdf_writer.add_page.call_count == 3
+        mock_pdf_writer.write_stream.assert_called_once()
+        
+        # Verify Mistral API calls
+        mock_mistral.files.upload.assert_called_once()
+        upload_call = mock_mistral.files.upload.call_args[1]
+        assert upload_call['file']['file_name'] == "test-uuid-1234"
+        assert upload_call['purpose'] == 'ocr'
+        
+        mock_mistral.files.get_signed_url.assert_called_once_with(
+            file_id="file-123", expiry=1
+        )
+        
+        mock_mistral.ocr.process.assert_called_once_with(
+            model="mistral-ocr-latest",
+            include_image_base64=True,
+            document={
+                "type": "document_url",
+                "document_url": "https://example.com/signed-url",
+            }
+        )
+
+    @patch('trustgraph.decoding.mistral_ocr.processor.uuid.uuid4')
+    @patch('trustgraph.decoding.mistral_ocr.processor.Mistral')
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_on_message_success(self, mock_flow_init, mock_mistral_class, mock_uuid):
+        """Test successful message processing"""
+        # Arrange
+        mock_flow_init.return_value = None
+        mock_uuid.return_value = "test-uuid-5678"
+        
+        # Mock Mistral client with simple OCR response
+        mock_mistral = MagicMock()
+        mock_mistral_class.return_value = mock_mistral
+        
+        # Mock the ocr method to return simple markdown
+        ocr_result = "# Document Title\nThis is the OCR content"
+        
+        # Mock message
+        pdf_content = b"fake pdf content"
+        pdf_base64 = base64.b64encode(pdf_content).decode('utf-8')
+        mock_metadata = Metadata(id="test-doc")
+        mock_document = Document(metadata=mock_metadata, data=pdf_base64)
+        mock_msg = MagicMock()
+        mock_msg.value.return_value = mock_document
+        
+        # Mock flow - needs to be a callable that returns an object with send method
+        mock_output_flow = AsyncMock()
+        mock_flow = MagicMock(return_value=mock_output_flow)
+        
+        config = {
+            'id': 'test-mistral-ocr',
+            'api_key': 'test-api-key',
+            'taskgroup': AsyncMock()
+        }
+
+        with patch.object(Processor, 'register_specification'):
+            processor = Processor(**config)
+            
+            # Mock the ocr method
+            with patch.object(processor, 'ocr', return_value=ocr_result):
+                # Act
+                await processor.on_message(mock_msg, None, mock_flow)
+
+        # Assert
+        # Verify output was sent
+        mock_output_flow.send.assert_called_once()
+        
+        # Check output
+        call_args = mock_output_flow.send.call_args[0][0]
+        assert isinstance(call_args, TextDocument)
+        assert call_args.metadata == mock_metadata
+        assert call_args.text == ocr_result.encode('utf-8')
+
+    @patch('trustgraph.decoding.mistral_ocr.processor.Mistral')
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_chunks_function(self, mock_flow_init, mock_mistral_class):
+        """Test the chunks utility function"""
+        # Arrange
+        from trustgraph.decoding.mistral_ocr.processor import chunks
+        
+        test_list = list(range(12))
+        
+        # Act
+        result = list(chunks(test_list, 5))
+        
+        # Assert
+        assert len(result) == 3
+        assert result[0] == [0, 1, 2, 3, 4]
+        assert result[1] == [5, 6, 7, 8, 9]
+        assert result[2] == [10, 11]
+
+    @patch('trustgraph.decoding.mistral_ocr.processor.Mistral')
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_replace_images_in_markdown(self, mock_flow_init, mock_mistral_class):
+        """Test the replace_images_in_markdown function"""
+        # Arrange
+        from trustgraph.decoding.mistral_ocr.processor import replace_images_in_markdown
+        
+        markdown = "# Title\n![image1](image1)\nSome text\n![image2](image2)"
+        images_dict = {
+            "image1": "data:image/png;base64,abc123",
+            "image2": "data:image/png;base64,def456"
+        }
+        
+        # Act
+        result = replace_images_in_markdown(markdown, images_dict)
+        
+        # Assert
+        expected = "# Title\n![image1](data:image/png;base64,abc123)\nSome text\n![image2](data:image/png;base64,def456)"
+        assert result == expected
+
+    @patch('trustgraph.decoding.mistral_ocr.processor.Mistral')
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_get_combined_markdown(self, mock_flow_init, mock_mistral_class):
+        """Test the get_combined_markdown function"""
+        # Arrange
+        from trustgraph.decoding.mistral_ocr.processor import get_combined_markdown
+        from mistralai.models import OCRResponse
+        
+        # Mock OCR response with multiple pages
+        mock_page1 = MagicMock(
+            markdown="# Page 1\n![img1](img1)",
+            images=[MagicMock(id="img1", image_base64="base64_img1")]
+        )
+        mock_page2 = MagicMock(
+            markdown="# Page 2\n![img2](img2)",
+            images=[MagicMock(id="img2", image_base64="base64_img2")]
+        )
+        mock_ocr_response = MagicMock(pages=[mock_page1, mock_page2])
+        
+        # Act
+        result = get_combined_markdown(mock_ocr_response)
+        
+        # Assert
+        expected = "# Page 1\n![img1](base64_img1)\n\n# Page 2\n![img2](base64_img2)"
+        assert result == expected
+
+    @patch('trustgraph.base.flow_processor.FlowProcessor.add_args')
+    def test_add_args(self, mock_parent_add_args):
+        """Test add_args adds API key argument"""
+        # Arrange
+        mock_parser = MagicMock()
+        
+        # Act
+        Processor.add_args(mock_parser)
+        
+        # Assert
+        mock_parent_add_args.assert_called_once_with(mock_parser)
+        mock_parser.add_argument.assert_called_once_with(
+            '-k', '--api-key',
+            default=None,  # default_api_key is None in test environment
+            help='Mistral API Key'
+        )
+
+    @patch('trustgraph.decoding.mistral_ocr.processor.Processor.launch')
+    def test_run(self, mock_launch):
+        """Test run function"""
+        # Act
+        from trustgraph.decoding.mistral_ocr.processor import run
+        run()
+        
+        # Assert
+        mock_launch.assert_called_once_with("mistral-ocr", 
+            "\nSimple decoder, accepts PDF documents on input, outputs pages from the\nPDF document as text as separate output objects.\n")
+
+
+if __name__ == '__main__':
+    pytest.main([__file__])
\ No newline at end of file
diff --git a/tests/unit/test_decoding/test_pdf_decoder.py b/tests/unit/test_decoding/test_pdf_decoder.py
new file mode 100644
index 00000000..b40accdf
--- /dev/null
+++ b/tests/unit/test_decoding/test_pdf_decoder.py
@@ -0,0 +1,229 @@
+"""
+Unit tests for trustgraph.decoding.pdf.pdf_decoder
+"""
+
+import pytest
+import base64
+import tempfile
+from unittest.mock import AsyncMock, MagicMock, patch, call
+from unittest import IsolatedAsyncioTestCase
+
+from trustgraph.decoding.pdf.pdf_decoder import Processor
+from trustgraph.schema import Document, TextDocument, Metadata
+
+
+class TestPdfDecoderProcessor(IsolatedAsyncioTestCase):
+    """Test PDF decoder processor functionality"""
+
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_processor_initialization(self, mock_flow_init):
+        """Test PDF decoder processor initialization"""
+        # Arrange
+        mock_flow_init.return_value = None
+        
+        config = {
+            'id': 'test-pdf-decoder',
+            'taskgroup': AsyncMock()
+        }
+
+        # Act
+        with patch.object(Processor, 'register_specification') as mock_register:
+            processor = Processor(**config)
+
+        # Assert
+        mock_flow_init.assert_called_once()
+        # Verify register_specification was called twice (consumer and producer)
+        assert mock_register.call_count == 2
+        
+        # Check consumer spec
+        consumer_call = mock_register.call_args_list[0]
+        consumer_spec = consumer_call[0][0]
+        assert consumer_spec.name == "input"
+        assert consumer_spec.schema == Document
+        assert consumer_spec.handler == processor.on_message
+        
+        # Check producer spec
+        producer_call = mock_register.call_args_list[1]
+        producer_spec = producer_call[0][0]
+        assert producer_spec.name == "output"
+        assert producer_spec.schema == TextDocument
+
+    @patch('trustgraph.decoding.pdf.pdf_decoder.PyPDFLoader')
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_on_message_success(self, mock_flow_init, mock_pdf_loader_class):
+        """Test successful PDF processing"""
+        # Arrange
+        mock_flow_init.return_value = None
+        
+        # Mock PDF content
+        pdf_content = b"fake pdf content"
+        pdf_base64 = base64.b64encode(pdf_content).decode('utf-8')
+        
+        # Mock PyPDFLoader
+        mock_loader = MagicMock()
+        mock_page1 = MagicMock(page_content="Page 1 content")
+        mock_page2 = MagicMock(page_content="Page 2 content")
+        mock_loader.load.return_value = [mock_page1, mock_page2]
+        mock_pdf_loader_class.return_value = mock_loader
+        
+        # Mock message
+        mock_metadata = Metadata(id="test-doc")
+        mock_document = Document(metadata=mock_metadata, data=pdf_base64)
+        mock_msg = MagicMock()
+        mock_msg.value.return_value = mock_document
+        
+        # Mock flow - needs to be a callable that returns an object with send method
+        mock_output_flow = AsyncMock()
+        mock_flow = MagicMock(return_value=mock_output_flow)
+        
+        config = {
+            'id': 'test-pdf-decoder',
+            'taskgroup': AsyncMock()
+        }
+
+        with patch.object(Processor, 'register_specification'):
+            processor = Processor(**config)
+
+        # Act
+        await processor.on_message(mock_msg, None, mock_flow)
+
+        # Assert
+        # Verify PyPDFLoader was called
+        mock_pdf_loader_class.assert_called_once()
+        mock_loader.load.assert_called_once()
+        
+        # Verify output was sent for each page
+        assert mock_output_flow.send.call_count == 2
+        
+        # Check first page output
+        first_call = mock_output_flow.send.call_args_list[0]
+        first_output = first_call[0][0]
+        assert isinstance(first_output, TextDocument)
+        assert first_output.metadata == mock_metadata
+        assert first_output.text == b"Page 1 content"
+        
+        # Check second page output
+        second_call = mock_output_flow.send.call_args_list[1]
+        second_output = second_call[0][0]
+        assert isinstance(second_output, TextDocument)
+        assert second_output.metadata == mock_metadata
+        assert second_output.text == b"Page 2 content"
+
+    @patch('trustgraph.decoding.pdf.pdf_decoder.PyPDFLoader')
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_on_message_empty_pdf(self, mock_flow_init, mock_pdf_loader_class):
+        """Test handling of empty PDF"""
+        # Arrange
+        mock_flow_init.return_value = None
+        
+        # Mock PDF content
+        pdf_content = b"fake pdf content"
+        pdf_base64 = base64.b64encode(pdf_content).decode('utf-8')
+        
+        # Mock PyPDFLoader with no pages
+        mock_loader = MagicMock()
+        mock_loader.load.return_value = []
+        mock_pdf_loader_class.return_value = mock_loader
+        
+        # Mock message
+        mock_metadata = Metadata(id="test-doc")
+        mock_document = Document(metadata=mock_metadata, data=pdf_base64)
+        mock_msg = MagicMock()
+        mock_msg.value.return_value = mock_document
+        
+        # Mock flow - needs to be a callable that returns an object with send method
+        mock_output_flow = AsyncMock()
+        mock_flow = MagicMock(return_value=mock_output_flow)
+        
+        config = {
+            'id': 'test-pdf-decoder',
+            'taskgroup': AsyncMock()
+        }
+
+        with patch.object(Processor, 'register_specification'):
+            processor = Processor(**config)
+
+        # Act
+        await processor.on_message(mock_msg, None, mock_flow)
+
+        # Assert
+        # Verify PyPDFLoader was called
+        mock_pdf_loader_class.assert_called_once()
+        mock_loader.load.assert_called_once()
+        
+        # Verify no output was sent
+        mock_output_flow.send.assert_not_called()
+
+    @patch('trustgraph.decoding.pdf.pdf_decoder.PyPDFLoader')
+    @patch('trustgraph.base.flow_processor.FlowProcessor.__init__')
+    async def test_on_message_unicode_content(self, mock_flow_init, mock_pdf_loader_class):
+        """Test handling of unicode content in PDF"""
+        # Arrange
+        mock_flow_init.return_value = None
+        
+        # Mock PDF content
+        pdf_content = b"fake pdf content"
+        pdf_base64 = base64.b64encode(pdf_content).decode('utf-8')
+        
+        # Mock PyPDFLoader with unicode content
+        mock_loader = MagicMock()
+        mock_page = MagicMock(page_content="Page with unicode: 你好世界 🌍")
+        mock_loader.load.return_value = [mock_page]
+        mock_pdf_loader_class.return_value = mock_loader
+        
+        # Mock message
+        mock_metadata = Metadata(id="test-doc")
+        mock_document = Document(metadata=mock_metadata, data=pdf_base64)
+        mock_msg = MagicMock()
+        mock_msg.value.return_value = mock_document
+        
+        # Mock flow - needs to be a callable that returns an object with send method
+        mock_output_flow = AsyncMock()
+        mock_flow = MagicMock(return_value=mock_output_flow)
+        
+        config = {
+            'id': 'test-pdf-decoder',
+            'taskgroup': AsyncMock()
+        }
+
+        with patch.object(Processor, 'register_specification'):
+            processor = Processor(**config)
+
+        # Act
+        await processor.on_message(mock_msg, None, mock_flow)
+
+        # Assert
+        # Verify output was sent
+        mock_output_flow.send.assert_called_once()
+        
+        # Check output
+        call_args = mock_output_flow.send.call_args[0][0]
+        assert isinstance(call_args, TextDocument)
+        assert call_args.text == "Page with unicode: 你好世界 🌍".encode('utf-8')
+
+    @patch('trustgraph.base.flow_processor.FlowProcessor.add_args')
+    def test_add_args(self, mock_parent_add_args):
+        """Test add_args calls parent method"""
+        # Arrange
+        mock_parser = MagicMock()
+        
+        # Act
+        Processor.add_args(mock_parser)
+        
+        # Assert
+        mock_parent_add_args.assert_called_once_with(mock_parser)
+
+    @patch('trustgraph.decoding.pdf.pdf_decoder.Processor.launch')
+    def test_run(self, mock_launch):
+        """Test run function"""
+        # Act
+        from trustgraph.decoding.pdf.pdf_decoder import run
+        run()
+        
+        # Assert
+        mock_launch.assert_called_once_with("pdf-decoder", 
+            "\nSimple decoder, accepts PDF documents on input, outputs pages from the\nPDF document as text as separate output objects.\n")
+
+
+if __name__ == '__main__':
+    pytest.main([__file__])
\ No newline at end of file
diff --git a/trustgraph-flow/pyproject.toml b/trustgraph-flow/pyproject.toml
index c7eef10b..911c91a0 100644
--- a/trustgraph-flow/pyproject.toml
+++ b/trustgraph-flow/pyproject.toml
@@ -36,7 +36,6 @@ dependencies = [
     "pulsar-client",
     "pymilvus",
     "pypdf",
-    "mistralai",
     "pyyaml",
     "qdrant-client",
     "rdflib",
diff --git a/trustgraph-flow/trustgraph/decoding/mistral_ocr/processor.py b/trustgraph-flow/trustgraph/decoding/mistral_ocr/processor.py
index 4bacd278..9532fa0f 100755
--- a/trustgraph-flow/trustgraph/decoding/mistral_ocr/processor.py
+++ b/trustgraph-flow/trustgraph/decoding/mistral_ocr/processor.py
@@ -15,17 +15,13 @@ from mistralai import DocumentURLChunk, ImageURLChunk, TextChunk
 from mistralai.models import OCRResponse
 
 from ... schema import Document, TextDocument, Metadata
-from ... schema import document_ingest_queue, text_ingest_queue
-from ... log_level import LogLevel
-from ... base import InputOutputProcessor
+from ... base import FlowProcessor, ConsumerSpec, ProducerSpec
 
 import logging
 
 logger = logging.getLogger(__name__)
 
-module = "ocr"
-
-default_subscriber = module
+default_ident = "mistral-ocr"
 default_api_key = os.getenv("MISTRAL_TOKEN")
 
 pages_per_chunk = 5
@@ -73,23 +69,34 @@ def get_combined_markdown(ocr_response: OCRResponse) -> str:
 
     return "\n\n".join(markdowns)
 
-class Processor(InputOutputProcessor):
+class Processor(FlowProcessor):
 
     def __init__(self, **params):
 
-        id = params.get("id")
-        subscriber = params.get("subscriber", default_subscriber)
+        id = params.get("id", default_ident)
         api_key = params.get("api_key", default_api_key)
 
         super(Processor, self).__init__(
             **params | {
                 "id": id,
-                "subscriber": subscriber,
-                "input_schema": Document,
-                "output_schema": TextDocument,
             }
         )
 
+        self.register_specification(
+            ConsumerSpec(
+                name = "input",
+                schema = Document,
+                handler = self.on_message,
+            )
+        )
+
+        self.register_specification(
+            ProducerSpec(
+                name = "output",
+                schema = TextDocument,
+            )
+        )
+
         if api_key is None:
             raise RuntimeError("Mistral API key not specified")
 
@@ -98,7 +105,7 @@ class Processor(InputOutputProcessor):
         # Used with Mistral doc upload
         self.unique_id = str(uuid.uuid4())
 
-        logger.info("PDF inited")
+        logger.info("Mistral OCR processor initialized")
 
     def ocr(self, blob):
 
@@ -151,7 +158,7 @@ class Processor(InputOutputProcessor):
 
             return markdown
 
-    async def on_message(self, msg, consumer):
+    async def on_message(self, msg, consumer, flow):
 
         logger.debug("PDF message received")
 
@@ -166,14 +173,14 @@ class Processor(InputOutputProcessor):
             text=markdown.encode("utf-8"),
         )
 
-        await consumer.q.output.send(r)
+        await flow("output").send(r)
 
         logger.info("Done.")
 
     @staticmethod
     def add_args(parser):
 
-        InputOutputProcessor.add_args(parser, default_subscriber)
+        FlowProcessor.add_args(parser)
 
         parser.add_argument(
             '-k', '--api-key',
@@ -183,5 +190,5 @@ class Processor(InputOutputProcessor):
 
 def run():
 
-    Processor.launch(module, __doc__)
+    Processor.launch(default_ident, __doc__)