1 files changed, 32 insertions, 0 deletions
diff --git a/activesupport/test/core_ext/integer_ext_test.rb b/activesupport/test/core_ext/integer_ext_test.rb
new file mode 100644
index 0000000000..5691dc5341
--- /dev/null
+++ b/activesupport/test/core_ext/integer_ext_test.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "abstract_unit"
+require "active_support/core_ext/integer"
+
+class IntegerExtTest < ActiveSupport::TestCase
+  PRIME = 22953686867719691230002707821868552601124472329079
+
+  def test_multiple_of
+    [ -7, 0, 7, 14 ].each { |i| assert i.multiple_of?(7) }
+    [ -7, 7, 14 ].each { |i| assert_not i.multiple_of?(6) }
+
+    # test the 0 edge case
+    assert 0.multiple_of?(0)
+    assert_not 5.multiple_of?(0)
+
+    # test with a prime
+    [2, 3, 5, 7].each { |i| assert_not PRIME.multiple_of?(i) }
+  end
+
+  def test_ordinalize
+    # These tests are mostly just to ensure that the ordinalize method exists.
+    # Its results are tested comprehensively in the inflector test cases.
+    assert_equal "1st", 1.ordinalize
+    assert_equal "8th", 8.ordinalize
+  end
+
+  def test_ordinal
+    assert_equal "st", 1.ordinal
+    assert_equal "th", 8.ordinal
+  end
+end