diff --git a/tests/test_arrays.scad b/tests/test_arrays.scad
index a66aeed..3aec4b7 100644
--- a/tests/test_arrays.scad
+++ b/tests/test_arrays.scad
@@ -589,6 +589,15 @@ module test_array_group() {
 test_array_group();
 
 
+module test_group_data() {
+    assert_equal(group_data([1,2,0], ["A","B","C"]), [["C"],["A"],["B"]]);
+    assert_equal(group_data([1,3,0], ["A","B","C"]), [["C"],["A"],[],["B"]]);
+    assert_equal(group_data([5,3,1], ["A","B","C"]), [[],["C"],[],["B"],[],["A"]]);
+    assert_equal(group_data([1,3,1], ["A","B","C"]), [[],["A","C"],[],["B"]]);
+}
+test_group_data();
+
+
 module test_flatten() {
     assert(flatten([[1,2,3], [4,5,[6,7,8]]]) == [1,2,3,4,5,[6,7,8]]);
     assert(flatten([]) == []);
diff --git a/tests/test_math.scad b/tests/test_math.scad
index b5c25b8..ad50ebb 100644
--- a/tests/test_math.scad
+++ b/tests/test_math.scad
@@ -227,6 +227,26 @@ module test_all_nonnegative() {
 test_all_nonnegative();
 
 
+module test_all_integer() {
+    assert(!all_integer(undef));
+    assert(!all_integer(true));
+    assert(!all_integer(false));
+    assert(!all_integer(4.3));
+    assert(!all_integer("foo"));
+    assert(!all_integer([]));
+    assert(!all_integer([3,4.1,5,7]));
+    assert(!all_integer([[1,2,3],[4,5,6],[7,8]]));
+    assert(all_integer(-4));
+    assert(all_integer(0));
+    assert(all_integer(5));
+    assert(all_integer([-3]));
+    assert(all_integer([0]));
+    assert(all_integer([3]));
+    assert(all_integer([2,-4,0,5,7,9876543210]));
+}
+test_all_integer();
+
+
 module test_approx() {
     assert_equal(approx(PI, 3.141592653589793236), true);
     assert_equal(approx(PI, 3.1415926), false);