diff --git a/tests/unit/test_http/test_api/test_blueprints/__init__.py b/tests/unit/test_http/test_api/test_blueprints/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/unit/test_http/test_api/test_blueprints/test_client.py b/tests/unit/test_http/test_api/test_blueprints/test_client.py
new file mode 100644
index 0000000..10fb69b
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+++ b/tests/unit/test_http/test_api/test_blueprints/test_client.py
@@ -0,0 +1,214 @@
+"""Unit tests for the Blueprints HTTP API client."""
+
+import datetime
+import io
+import zipfile
+from unittest.mock import AsyncMock, MagicMock
+
+import httpx
+import pytest
+
+import enapter
+
+
+@pytest.fixture
+def mock_httpx_client():
+    """Fixture to provide a mocked httpx.AsyncClient."""
+    return MagicMock(spec=httpx.AsyncClient)
+
+
+@pytest.fixture
+def client(mock_httpx_client):
+    """Fixture to provide a Blueprints API client with a mocked internal client."""
+    return enapter.http.api.blueprints.Client(client=mock_httpx_client)
+
+
+@pytest.mark.asyncio
+async def test_get_blueprint(client, mock_httpx_client):
+    """Test getting a blueprint by ID."""
+    mock_response = MagicMock(spec=httpx.Response)
+    mock_response.status_code = 200
+    mock_response.json.return_value = {
+        "blueprint": {"id": "bp_123", "created_at": "2024-04-01T12:00:00+00:00"}
+    }
+    mock_httpx_client.get = AsyncMock(return_value=mock_response)
+
+    blueprint = await client.get("bp_123")
+
+    assert blueprint.id == "bp_123"
+    assert blueprint.created_at == datetime.datetime.fromisoformat(
+        "2024-04-01T12:00:00+00:00"
+    )
+    mock_httpx_client.get.assert_called_once_with("v3/blueprints/bp_123")
+
+
+@pytest.mark.asyncio
+async def test_upload_data(client, mock_httpx_client):
+    """Test uploading raw data as a blueprint."""
+    mock_response = MagicMock(spec=httpx.Response)
+    mock_response.status_code = 200
+    mock_response.json.return_value = {
+        "blueprint": {"id": "bp_new", "created_at": "2024-04-01T12:00:00+00:00"}
+    }
+    mock_httpx_client.post = AsyncMock(return_value=mock_response)
+
+    data = b"blueprint content"
+    blueprint = await client.upload(data)
+
+    assert blueprint.id == "bp_new"
+    assert blueprint.created_at == datetime.datetime.fromisoformat(
+        "2024-04-01T12:00:00+00:00"
+    )
+    mock_httpx_client.post.assert_called_once_with("v3/blueprints/upload", content=data)
+
+
+@pytest.mark.asyncio
+async def test_upload_file(client, mock_httpx_client, tmp_path):
+    """Test uploading a blueprint file."""
+    mock_response = MagicMock(spec=httpx.Response)
+    mock_response.status_code = 200
+    mock_response.json.return_value = {
+        "blueprint": {"id": "bp_file", "created_at": "2024-04-01T12:00:00+00:00"}
+    }
+    mock_httpx_client.post = AsyncMock(return_value=mock_response)
+
+    file_path = tmp_path / "manifest.yaml"
+    file_path.write_bytes(b"manifest content")
+
+    blueprint = await client.upload_file(file_path)
+
+    assert blueprint.id == "bp_file"
+    mock_httpx_client.post.assert_called_once_with(
+        "v3/blueprints/upload", content=b"manifest content"
+    )
+
+
+@pytest.mark.asyncio
+async def test_upload_directory(client, mock_httpx_client, tmp_path):
+    """Test uploading a blueprint directory."""
+    mock_response = MagicMock(spec=httpx.Response)
+    mock_response.status_code = 200
+    mock_response.json.return_value = {
+        "blueprint": {"id": "bp_dir", "created_at": "2024-04-01T12:00:00+00:00"}
+    }
+    mock_httpx_client.post = AsyncMock(return_value=mock_response)
+
+    # Setup a directory with a file
+    dir_path = tmp_path / "blueprint"
+    dir_path.mkdir()
+    file_path = dir_path / "manifest.yaml"
+    file_path.write_bytes(b"manifest content")
+
+    blueprint = await client.upload_directory(dir_path)
+
+    assert blueprint.id == "bp_dir"
+
+    # Verify a zip file was sent
+    mock_httpx_client.post.assert_called_once()
+    call_args = mock_httpx_client.post.call_args
+    assert call_args[0][0] == "v3/blueprints/upload"
+    sent_data = call_args[1]["content"]
+
+    # Verify it's a valid zip file containing our file
+    with zipfile.ZipFile(io.BytesIO(sent_data)) as zf:
+        assert "manifest.yaml" in zf.namelist()
+        assert zf.read("manifest.yaml") == b"manifest content"
+
+
+@pytest.mark.asyncio
+async def test_download(client, mock_httpx_client):
+    """Test downloading a blueprint."""
+    mock_response = MagicMock(spec=httpx.Response)
+    mock_response.status_code = 200
+    mock_response.content = b"zip content"
+    mock_httpx_client.get = AsyncMock(return_value=mock_response)
+
+    data = await client.download("bp_123")
+
+    assert data == b"zip content"
+    mock_httpx_client.get.assert_called_once_with(
+        "v3/blueprints/bp_123/zip", params={"view": "ORIGINAL"}
+    )
+
+
+@pytest.mark.asyncio
+async def test_validate_success(client, mock_httpx_client):
+    """Test successful validation."""
+    mock_response = MagicMock(spec=httpx.Response)
+    mock_response.status_code = 200
+    mock_response.json.return_value = {}
+    mock_httpx_client.post = AsyncMock(return_value=mock_response)
+
+    await client.validate(b"blueprint content")
+
+    mock_httpx_client.post.assert_called_once_with(
+        "v3/blueprints/validate", content=b"blueprint content"
+    )
+
+
+@pytest.mark.asyncio
+async def test_validate_error(client, mock_httpx_client):
+    """Test validation with errors."""
+    mock_response = MagicMock(spec=httpx.Response)
+    mock_response.status_code = 200
+    mock_response.json.return_value = {
+        "validation_errors": ["Invalid manifest", "Missing field"]
+    }
+    mock_httpx_client.post = AsyncMock(return_value=mock_response)
+
+    with pytest.raises(enapter.http.api.MultiError) as exc_info:
+        await client.validate(b"blueprint content")
+
+    errors = exc_info.value.errors
+    assert len(errors) == 2
+    assert errors[0].message == "Invalid manifest"
+    assert errors[1].message == "Missing field"
+    mock_httpx_client.post.assert_called_once_with(
+        "v3/blueprints/validate", content=b"blueprint content"
+    )
+
+
+@pytest.mark.asyncio
+async def test_validate_file(client, mock_httpx_client, tmp_path):
+    """Test validating a blueprint file."""
+    mock_response = MagicMock(spec=httpx.Response)
+    mock_response.status_code = 200
+    mock_response.json.return_value = {}
+    mock_httpx_client.post = AsyncMock(return_value=mock_response)
+
+    file_path = tmp_path / "manifest.yaml"
+    file_path.write_bytes(b"manifest content")
+
+    await client.validate_file(file_path)
+
+    mock_httpx_client.post.assert_called_once_with(
+        "v3/blueprints/validate", content=b"manifest content"
+    )
+
+
+@pytest.mark.asyncio
+async def test_validate_directory(client, mock_httpx_client, tmp_path):
+    """Test validating a blueprint directory."""
+    mock_response = MagicMock(spec=httpx.Response)
+    mock_response.status_code = 200
+    mock_response.json.return_value = {}
+    mock_httpx_client.post = AsyncMock(return_value=mock_response)
+
+    # Setup a directory with a file
+    dir_path = tmp_path / "blueprint"
+    dir_path.mkdir()
+    file_path = dir_path / "manifest.yaml"
+    file_path.write_bytes(b"manifest content")
+
+    await client.validate_directory(dir_path)
+
+    # Verify a zip file was sent
+    mock_httpx_client.post.assert_called_once()
+    call_args = mock_httpx_client.post.call_args
+    assert call_args[0][0] == "v3/blueprints/validate"
+    sent_data = call_args[1]["content"]
+
+    # Verify it's a valid zip file containing our file
+    with zipfile.ZipFile(io.BytesIO(sent_data)) as zf:
+        assert "manifest.yaml" in zf.namelist()
+        assert zf.read("manifest.yaml") == b"manifest content"