1 files changed, 45 insertions, 0 deletions
diff --git a/test/prism/integer_parse_test.rb b/test/prism/integer_parse_test.rb
new file mode 100644
index 0000000000..f42e817e79
--- /dev/null
+++ b/test/prism/integer_parse_test.rb
@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+require_relative "test_helper"
+
+return if Prism::BACKEND == :FFI
+
+module Prism
+  class IntegerParseTest < TestCase
+    def test_integer_parse
+      assert_integer_parse(1)
+      assert_integer_parse(50)
+      assert_integer_parse(100)
+      assert_integer_parse(100, "1_0_0")
+      assert_integer_parse(8, "0_1_0")
+
+      assert_integer_parse(10, "0b1010")
+      assert_integer_parse(10, "0B1010")
+      assert_integer_parse(10, "0o12")
+      assert_integer_parse(10, "0O12")
+      assert_integer_parse(10, "012")
+      assert_integer_parse(10, "0d10")
+      assert_integer_parse(10, "0D10")
+      assert_integer_parse(10, "0xA")
+      assert_integer_parse(10, "0XA")
+
+      assert_integer_parse(2**32)
+      assert_integer_parse(2**64 + 2**32)
+      assert_integer_parse(2**128 + 2**64 + 2**32)
+
+      num = 99 ** 99
+      assert_integer_parse(num, "0b#{num.to_s(2)}")
+      assert_integer_parse(num, "0o#{num.to_s(8)}")
+      assert_integer_parse(num, "0d#{num.to_s(10)}")
+      assert_integer_parse(num, "0x#{num.to_s(16)}")
+    end
+
+    private
+
+    def assert_integer_parse(expected, source = expected.to_s)
+      integer, string = Debug.integer_parse(source)
+      assert_equal expected, integer
+      assert_equal expected.to_s, string
+    end
+  end
+end