[ruby/prism] Duplicated hash keys

https://github.com/ruby/prism/commit/3e10c46c14

1 files changed, 68 insertions, 0 deletions

diff --git a/test/prism/static_literals_test.rb b/test/prism/static_literals_test.rb
new file mode 100644
index 0000000000..a35bb1cd49
--- /dev/null
+++ b/test/prism/static_literals_test.rb
@@ -0,0 +1,68 @@
+# frozen_string_literal: true
+
+require_relative "test_helper"
+
+module Prism
+  class StaticLiteralsTest < TestCase
+    def test_static_literals
+      assert_warning("1")
+      assert_warning("0xA", "10")
+      assert_warning("0o10", "8")
+      assert_warning("0b10", "2")
+      assert_warning("1_000")
+      assert_warning((2**32).to_s(10), "0x#{(2**32).to_s(16)}")
+      assert_warning((2**64).to_s(10), "0x#{(2**64).to_s(16)}")
+
+      assert_warning("__LINE__", "2")
+      assert_warning("3", "__LINE__")
+
+      assert_warning("1.0")
+      assert_warning("1e2", "100.0")
+
+      assert_warning("1r")
+      assert_warning("1.0r")
+
+      assert_warning("1i")
+      assert_warning("1.0i")
+
+      assert_warning("1ri")
+      assert_warning("1.0ri")
+
+      assert_warning("\"#{__FILE__}\"")
+      assert_warning("\"foo\"")
+      assert_warning("\"#{__FILE__}\"", "__FILE__")
+
+      assert_warning("/foo/")
+      refute_warning("/foo/", "/foo/i")
+
+      assert_warning(":foo")
+      assert_warning("%s[foo]")
+
+      assert_warning("true")
+      assert_warning("false")
+      assert_warning("nil")
+      assert_warning("__ENCODING__")
+    end
+
+    private
+
+    def parse_warning(left, right)
+      source = <<~RUBY
+        {
+          #{left} => 1,
+          #{right} => 2
+        }
+      RUBY
+
+      Prism.parse(source, filepath: __FILE__).warnings.first
+    end
+
+    def assert_warning(left, right = left)
+      assert_match %r{key #{Regexp.escape(left)} .+ line 3}, parse_warning(left, right)&.message
+    end
+
+    def refute_warning(left, right)
+      assert_nil parse_warning(left, right)
+    end
+  end
+end