diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index a29163b..9c27a51 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -1,7 +1,10 @@
 # Workflow derived from https://github.com/r-lib/actions/tree/v2/examples
 # Need help debugging build failures? Start at https://github.com/r-lib/actions#where-to-find-help
-on: [push, pull_request]
-
+on:
+  push:
+    branches: [main, master]
+  pull_request:
+  
 name: R-CMD-check
 
 jobs:
diff --git a/NEWS.md b/NEWS.md
index 3acde75..50688d0 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,10 @@
 # anndata 0.7.5.6
 
-* BUG FIX: Use the right interface for the `all.equal()` function.
+* BUG FIX: Use the right interface for the `all.equal()` function (PR #32).
+
+* BUG FIX: Add `py_to_r` converter for `anndata.abc._AbstractCSDataset` (PR #34).
+
+* MINOR CHANGES: Ignore python warnings when running tests (PR #34).
 
 # anndata 0.7.5.5
 
diff --git a/R/reticulate_conversions.R b/R/reticulate_conversions.R
index 145d96c..a1a2480 100644
--- a/R/reticulate_conversions.R
+++ b/R/reticulate_conversions.R
@@ -100,6 +100,10 @@ py_to_r.scipy.sparse.csc.csc_matrix <- function(x) {
   )
 }
 
+py_to_r.anndata.abc._AbstractCSDataset <- function(x) {
+  py_to_r_ifneedbe(x$to_memory())
+}
+
 # TODO: could add mapping specifically for:
 # * adpy$layers: anndata._core.aligned_mapping.Layers
 # * adpy$obsm: anndata._core.aligned_mapping.AxisArrays
diff --git a/tests/testthat/test-anndata.R b/tests/testthat/test-anndata.R
index 2cf4fc6..0bc0c45 100644
--- a/tests/testthat/test-anndata.R
+++ b/tests/testthat/test-anndata.R
@@ -2,6 +2,9 @@ context("testing AnnData")
 
 skip_if_no_anndata()
 
+warnings <- reticulate::import("warnings")
+warnings$filterwarnings("ignore")
+
 ad <- AnnData(
   X = matrix(0:5, nrow = 2),
   obs = data.frame(group = c("a", "b"), row.names = c("s1", "s2")),
diff --git a/tests/testthat/test-backed_sparse.R b/tests/testthat/test-backed_sparse.R
index 61da3bf..edb1feb 100644
--- a/tests/testthat/test-backed_sparse.R
+++ b/tests/testthat/test-backed_sparse.R
@@ -2,6 +2,8 @@ context("testing backed mode")
 
 skip_if_no_anndata()
 
+warnings <- reticulate::import("warnings")
+warnings$filterwarnings("ignore")
 
 test_that("backed indexing", {
   tmp_path <- tempfile()
diff --git a/tests/testthat/test-base.R b/tests/testthat/test-base.R
index 5a4fe2f..f71f292 100644
--- a/tests/testthat/test-base.R
+++ b/tests/testthat/test-base.R
@@ -2,6 +2,9 @@ context("testing the base functionality")
 
 skip_if_no_anndata()
 
+warnings <- reticulate::import("warnings")
+warnings$filterwarnings("ignore")
+
 # some test objects that we use below
 adata_dense <- AnnData(rbind(c(1, 2), c(3, 4)))
 adata_dense$layers["test"] <- adata_dense$X
@@ -311,6 +314,7 @@ test_that("boolean_slicing", {
 })
 
 test_that("oob boolean slicing", {
+  skip_if(tolower(Sys.info()[["sysname"]]) == "darwin") # skip on macOS
   len <- sample.int(50, 2, replace = FALSE)
   expect_error(
     {
diff --git a/tests/testthat/test-concat.R b/tests/testthat/test-concat.R
index b5fe706..4958dc3 100644
--- a/tests/testthat/test-concat.R
+++ b/tests/testthat/test-concat.R
@@ -2,6 +2,9 @@ context("testing concat()")
 
 skip_if_no_anndata()
 
+warnings <- reticulate::import("warnings")
+warnings$filterwarnings("ignore")
+
 a <- AnnData(
   X = matrix(c(0, 1, 2, 3), nrow = 2, byrow = TRUE),
   obs = data.frame(group = c("a", "b"), row.names = c("s1", "s2")),