diff --git a/sign/mask_test.go b/sign/mask_test.go
index 06a00bb4..5d36cacb 100644
--- a/sign/mask_test.go
+++ b/sign/mask_test.go
@@ -45,20 +45,56 @@ func TestMask_CreateMask(t *testing.T) {
 	require.Error(t, err)
 }
 
-func TestMask_SetBit(t *testing.T) {
+func TestMask_SetGetBit(t *testing.T) {
 	mask, err := NewMask(suite, publics, publics[2])
 	require.NoError(t, err)
 
+	// Make sure the mask is initially as we'd expect.
+
+	bit, err := mask.GetBit(1)
+	require.NoError(t, err)
+	require.False(t, bit)
+
+	bit, err = mask.GetBit(2)
+	require.NoError(t, err)
+	require.True(t, bit)
+
+	// Set bit 1
+
 	err = mask.SetBit(1, true)
 	require.NoError(t, err)
 	require.Equal(t, uint8(0x6), mask.Mask()[0])
 	require.Equal(t, 2, len(mask.Participants()))
 
+	bit, err = mask.GetBit(1)
+	require.NoError(t, err)
+	require.True(t, bit)
+
+	// Unset bit 2
+
 	err = mask.SetBit(2, false)
 	require.NoError(t, err)
 	require.Equal(t, uint8(0x2), mask.Mask()[0])
 	require.Equal(t, 1, len(mask.Participants()))
 
+	bit, err = mask.GetBit(2)
+	require.NoError(t, err)
+	require.False(t, bit)
+
+	// Unset bit 10 (using byte 2 now)
+
+	err = mask.SetBit(10, false)
+	require.NoError(t, err)
+	require.Equal(t, uint8(0x2), mask.Mask()[0])
+	require.Equal(t, uint8(0x4), mask.Mask()[1])
+	require.Equal(t, 2, len(mask.Participants()))
+
+	bit, err = mask.GetBit(10)
+	require.NoError(t, err)
+	require.True(t, bit)
+
+	// And make sure the range limit works.
+
 	err = mask.SetBit(-1, true)
 	require.Error(t, err)
 	err = mask.SetBit(len(publics), true)