Add specs for the it variable in blocks

Author: herwinw

language/it_spec.rb

@@ -0,0 +1,26 @@
+require_relative '../spec_helper'
+
+describe "The it parameter" do
+  it "should use the local variable if exists" do
+    it = 123
+    [1, 2, 3].map { it }.should == [123, 123, 123]
+  end
+
+  ruby_version_is ""..."3.4" do
+    it "should use the method if no local variable exists" do
+      # This test is hacky: we now depend on the `it` method of the specs
+      suppress_warning do
+        -> {
+          eval("[1, 2, 3].map { it }")
+        }.should raise_error(ArgumentError, "wrong number of arguments (given 0, expected 1)")
+      end
+    end
+  end
+
+  ruby_version_is "3.4" do
+    it "should act as the first argument if no local variable exists" do
+      # eval is required for suppress_warning
+      eval("[1, 2, 3].map { it }").should == [1, 2, 3]
+    end
+  end
+end