diff --git a/tests/_async/test_request_builder.py b/tests/_async/test_request_builder.py
index 6bb3f4e5..dfbf0bf2 100644
--- a/tests/_async/test_request_builder.py
+++ b/tests/_async/test_request_builder.py
@@ -3,7 +3,7 @@
 import pytest
 from httpx import Request, Response
 
-from postgrest import AsyncRequestBuilder
+from postgrest import AsyncRequestBuilder, AsyncSingleRequestBuilder
 from postgrest.base_request_builder import APIResponse, SingleAPIResponse
 from postgrest.types import CountMethod
 from postgrest.utils import AsyncClient
@@ -36,6 +36,12 @@ def test_select_with_count(self, request_builder: AsyncRequestBuilder):
         assert builder.http_method == "HEAD"
         assert builder.json == {}
 
+    def test_select_as_csv(self, request_builder: AsyncRequestBuilder):
+        builder = request_builder.select("*").csv()
+
+        assert builder.headers["Accept"] == "text/csv"
+        assert isinstance(builder, AsyncSingleRequestBuilder)
+
 
 class TestInsert:
     def test_insert(self, request_builder: AsyncRequestBuilder):
@@ -146,6 +152,11 @@ def test_explain_options(self, request_builder: AsyncRequestBuilder):
         )
 
 
+@pytest.fixture
+def csv_api_response() -> str:
+    return "id,name\n1,foo\n"
+
+
 @pytest.fixture
 def api_response_with_error() -> Dict[str, Any]:
     return {
@@ -281,6 +292,15 @@ def request_response_with_single_data(
     )
 
 
+@pytest.fixture
+def request_response_with_csv_data(csv_api_response: str) -> Response:
+    return Response(
+        status_code=200,
+        text=csv_api_response,
+        request=Request(method="GET", url="http://example.com"),
+    )
+
+
 class TestApiResponse:
     def test_response_raises_when_api_error(
         self, api_response_with_error: Dict[str, Any]
@@ -374,3 +394,12 @@ def test_single_from_http_request_response_constructor(
         assert isinstance(result.data, dict)
         assert result.data == single_api_response
         assert result.count == 2
+
+    def test_single_with_csv_data(
+        self, request_response_with_csv_data: Response, csv_api_response: str
+    ):
+        result = SingleAPIResponse.from_http_request_response(
+            request_response_with_csv_data
+        )
+        assert isinstance(result.data, str)
+        assert result.data == csv_api_response
diff --git a/tests/_sync/test_request_builder.py b/tests/_sync/test_request_builder.py
index 5d0ecd25..5d8773e9 100644
--- a/tests/_sync/test_request_builder.py
+++ b/tests/_sync/test_request_builder.py
@@ -3,7 +3,7 @@
 import pytest
 from httpx import Request, Response
 
-from postgrest import SyncRequestBuilder
+from postgrest import SyncRequestBuilder, SyncSingleRequestBuilder
 from postgrest.base_request_builder import APIResponse, SingleAPIResponse
 from postgrest.types import CountMethod
 from postgrest.utils import SyncClient
@@ -36,6 +36,12 @@ def test_select_with_count(self, request_builder: SyncRequestBuilder):
         assert builder.http_method == "HEAD"
         assert builder.json == {}
 
+    def test_select_as_csv(self, request_builder: SyncRequestBuilder):
+        builder = request_builder.select("*").csv()
+
+        assert builder.headers["Accept"] == "text/csv"
+        assert isinstance(builder, SyncSingleRequestBuilder)
+
 
 class TestInsert:
     def test_insert(self, request_builder: SyncRequestBuilder):
@@ -146,6 +152,11 @@ def test_explain_options(self, request_builder: SyncRequestBuilder):
         )
 
 
+@pytest.fixture
+def csv_api_response() -> str:
+    return "id,name\n1,foo\n"
+
+
 @pytest.fixture
 def api_response_with_error() -> Dict[str, Any]:
     return {
@@ -281,6 +292,15 @@ def request_response_with_single_data(
     )
 
 
+@pytest.fixture
+def request_response_with_csv_data(csv_api_response: str) -> Response:
+    return Response(
+        status_code=200,
+        text=csv_api_response,
+        request=Request(method="GET", url="http://example.com"),
+    )
+
+
 class TestApiResponse:
     def test_response_raises_when_api_error(
         self, api_response_with_error: Dict[str, Any]
@@ -374,3 +394,12 @@ def test_single_from_http_request_response_constructor(
         assert isinstance(result.data, dict)
         assert result.data == single_api_response
         assert result.count == 2
+
+    def test_single_with_csv_data(
+        self, request_response_with_csv_data: Response, csv_api_response: str
+    ):
+        result = SingleAPIResponse.from_http_request_response(
+            request_response_with_csv_data
+        )
+        assert isinstance(result.data, str)
+        assert result.data == csv_api_response