1 files changed, 50 insertions, 0 deletions
diff --git a/test/ruby/test_symbol.rb b/test/ruby/test_symbol.rb
new file mode 100644
index 0000000000..b6dd203596
--- /dev/null
+++ b/test/ruby/test_symbol.rb
@@ -0,0 +1,50 @@
+require 'test/unit'
+
+class TestSymbol < Test::Unit::TestCase
+  # [ruby-core:3573]
+
+  def assert_eval_inspected(sym)
+    n = sym.inspect
+    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(n))}
+  end
+
+  def test_inspect_invalid
+    # 2) Symbol#inspect sometimes returns invalid symbol representations:
+    assert_eval_inspected(:"!")
+    assert_eval_inspected(:"=")
+    assert_eval_inspected(:"0")
+    assert_eval_inspected(:"$1")
+    assert_eval_inspected(:"@1")
+    assert_eval_inspected(:"@@1")
+    assert_eval_inspected(:"@")
+    assert_eval_inspected(:"@@")
+  end
+
+  def assert_inspect_evaled(n)
+    assert_nothing_raised(SyntaxError) {assert_equal(n, eval(n).inspect)}
+  end
+
+  def test_inspect_suboptimal
+    # 3) Symbol#inspect sometimes returns suboptimal symbol representations:
+    assert_inspect_evaled(':foo')
+    assert_inspect_evaled(':foo!')
+    assert_inspect_evaled(':bar?')
+  end
+
+  def test_inspect_dollar
+    # 4) :$- always treats next character literally:
+    sym = "$-".intern
+    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(':$-'))}
+    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(":$-\n"))}
+    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(":$- "))}
+    assert_nothing_raised(SyntaxError) {assert_equal(sym, eval(":$-#"))}
+    assert_raise(SyntaxError) {eval ':$-('}
+  end
+
+  def test_inspect_number
+    # 5) Inconsistency between :$0 and :$1? The first one is valid, but the 
+    # latter isn't.
+    assert_inspect_evaled(':$0')
+    assert_inspect_evaled(':$1')
+  end
+end