Add specs for regex literal expansion (#13253)

spec/compiler/normalize/regex_spec.cr

@@ -0,0 +1,31 @@
+require "../../spec_helper"
+
+describe "Normalize: regex literal" do
+  describe "options" do
+    it "empty" do
+      assert_expand %q(/#{"".to_s}/), <<-'CRYSTAL'
+      ::Regex.new("#{"".to_s}", ::Regex::Options.new(0))
+      CRYSTAL
+    end
+    it "i" do
+      assert_expand %q(/#{"".to_s}/i), <<-'CRYSTAL'
+      ::Regex.new("#{"".to_s}", ::Regex::Options.new(1))
+      CRYSTAL
+    end
+    it "x" do
+      assert_expand %q(/#{"".to_s}/x), <<-'CRYSTAL'
+      ::Regex.new("#{"".to_s}", ::Regex::Options.new(8))
+      CRYSTAL
+    end
+    it "im" do
+      assert_expand %q(/#{"".to_s}/im), <<-'CRYSTAL'
+      ::Regex.new("#{"".to_s}", ::Regex::Options.new(7))
+      CRYSTAL
+    end
+    it "imx" do
+      assert_expand %q(/#{"".to_s}/imx), <<-'CRYSTAL'
+      ::Regex.new("#{"".to_s}", ::Regex::Options.new(15))
+      CRYSTAL
+    end
+  end
+end

src/compiler/crystal/semantic/literal_expander.cr

@@ -343,6 +343,14 @@ module Crystal
       end
     end
 
+    private def regex_new_call(node, value)
+      Call.new(Path.global("Regex").at(node), "new", value, regex_options(node)).at(node)
+    end
+
+    private def regex_options(node)
+      Call.new(Path.global(["Regex", "Options"]).at(node), "new", NumberLiteral.new(node.options.value.to_s).at(node)).at(node)
+    end
+
     # Convert and to if:
     #
     # From:
@@ -1019,14 +1027,6 @@ module Crystal
       end
     end
 
-    private def regex_new_call(node, value)
-      Call.new(Path.global("Regex").at(node), "new", value, regex_options(node)).at(node)
-    end
-
-    private def regex_options(node)
-      Call.new(Path.global(["Regex", "Options"]).at(node), "new", NumberLiteral.new(node.options.value).at(node)).at(node)
-    end
-
     def expand(node)
       raise "#{node} (#{node.class}) can't be expanded"
     end