diff --git a/support/testing/tests/fs/test_squashfs.py b/support/testing/tests/fs/test_squashfs.py
index a914f5aac7..0ceb4cab58 100644
--- a/support/testing/tests/fs/test_squashfs.py
+++ b/support/testing/tests/fs/test_squashfs.py
@@ -10,6 +10,7 @@ class TestSquashfs(infra.basetest.BRTest):
         BR2_TARGET_ROOTFS_SQUASHFS4_LZO=y
         # BR2_TARGET_ROOTFS_TAR is not set
         """
+    expected_blocksize_in_bytes = 128*1024
 
     def test_run(self):
         unsquashfs_cmd = ["host/bin/unsquashfs", "-s", "images/rootfs.squashfs"]
@@ -18,6 +19,7 @@ class TestSquashfs(infra.basetest.BRTest):
         self.assertEqual(out[0],
                          "Found a valid SQUASHFS 4:0 superblock on images/rootfs.squashfs.")
         self.assertEqual(out[3], "Compression lzo")
+        self.assertEqual(out[4], "Block size {}".format(self.expected_blocksize_in_bytes))
 
         img = os.path.join(self.builddir, "images", "rootfs.squashfs")
         infra.img_round_power2(img)
@@ -31,3 +33,25 @@ class TestSquashfs(infra.basetest.BRTest):
 
         cmd = "mount | grep '/dev/root on / type squashfs'"
         self.assertRunOk(cmd)
+
+
+class TestSquashfsMinBlocksize(TestSquashfs):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_TARGET_ROOTFS_SQUASHFS=y
+        BR2_TARGET_ROOTFS_SQUASHFS_BS_4K=y
+        BR2_TARGET_ROOTFS_SQUASHFS4_LZO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+    expected_blocksize_in_bytes = 4*1024
+
+
+class TestSquashfsMaxBlocksize(TestSquashfs):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_TARGET_ROOTFS_SQUASHFS=y
+        BR2_TARGET_ROOTFS_SQUASHFS_BS_1024K=y
+        BR2_TARGET_ROOTFS_SQUASHFS4_LZO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+    expected_blocksize_in_bytes = 1024*1024