1 files changed, 68 insertions, 0 deletions
diff --git a/spec/ruby/core/module/set_temporary_name_spec.rb b/spec/ruby/core/module/set_temporary_name_spec.rb
new file mode 100644
index 0000000000..f5886a3398
--- /dev/null
+++ b/spec/ruby/core/module/set_temporary_name_spec.rb
@@ -0,0 +1,68 @@
+require_relative '../../spec_helper'
+
+ruby_version_is "3.3" do
+  describe "Module#set_temporary_name" do
+    it "can assign a temporary name" do
+      m = Module.new
+      m.name.should be_nil
+
+      m.set_temporary_name("fake_name")
+      m.name.should == "fake_name"
+
+      m.set_temporary_name(nil)
+      m.name.should be_nil
+    end
+
+    it "can assign a temporary name which is not a valid constant path" do
+      m = Module.new
+      m.set_temporary_name("a::B")
+      m.name.should == "a::B"
+
+      m.set_temporary_name("Template['foo.rb']")
+      m.name.should == "Template['foo.rb']"
+    end
+
+    it "can't assign empty string as name" do
+      m = Module.new
+      -> { m.set_temporary_name("") }.should raise_error(ArgumentError, "empty class/module name")
+    end
+
+    it "can't assign a constant name as a temporary name" do
+      m = Module.new
+      -> { m.set_temporary_name("Object") }.should raise_error(ArgumentError, "the temporary name must not be a constant path to avoid confusion")
+    end
+
+    it "can't assign a constant path as a temporary name" do
+      m = Module.new
+      -> { m.set_temporary_name("A::B") }.should raise_error(ArgumentError, "the temporary name must not be a constant path to avoid confusion")
+      -> { m.set_temporary_name("::A") }.should raise_error(ArgumentError, "the temporary name must not be a constant path to avoid confusion")
+      -> { m.set_temporary_name("::A::B") }.should raise_error(ArgumentError, "the temporary name must not be a constant path to avoid confusion")
+    end
+
+    it "can't assign name to permanent module" do
+      -> { Object.set_temporary_name("fake_name") }.should raise_error(RuntimeError, "can't change permanent name")
+    end
+
+    it "can assign a temporary name to a nested module" do
+      m = Module.new
+      module m::N; end
+      m::N.name.should =~ /\A#<Module:0x\h+>::N\z/
+
+      m::N.set_temporary_name("fake_name")
+      m::N.name.should == "fake_name"
+
+      m::N.set_temporary_name(nil)
+      m::N.name.should be_nil
+    end
+
+    it "can update the name when assigned to a constant" do
+      m = Module.new
+      m::N = Module.new
+      m::N.name.should =~ /\A#<Module:0x\h+>::N\z/
+      m::N.set_temporary_name(nil)
+
+      m::M = m::N
+      m::M.name.should =~ /\A#<Module:0x\h+>::M\z/m
+    end
+  end
+end