1 files changed, 59 insertions, 2 deletions
diff --git a/spec/ruby/core/data/to_s_spec.rb b/spec/ruby/core/data/to_s_spec.rb
index 2b4a670e8e..e436c21109 100644
--- a/spec/ruby/core/data/to_s_spec.rb
+++ b/spec/ruby/core/data/to_s_spec.rb
@@ -1,6 +1,63 @@
 require_relative '../../spec_helper'
-require_relative 'shared/inspect'
+require_relative 'fixtures/classes'
 
 describe "Data#to_s" do
-  it_behaves_like :data_inspect, :to_s
+  it "returns a string representation showing members and values" do
+    a = DataSpecs::Measure.new(42, "km")
+    a.to_s.should == '#<data DataSpecs::Measure amount=42, unit="km">'
+  end
+
+  it "returns a string representation without the class name for anonymous structs" do
+    Data.define(:a).new("").to_s.should == '#<data a="">'
+  end
+
+  it "returns a string representation without the class name for structs nested in anonymous classes" do
+    c = Class.new
+    c.class_eval <<~DOC
+        Foo = Data.define(:a)
+      DOC
+
+    c::Foo.new("").to_s.should == '#<data a="">'
+  end
+
+  it "returns a string representation without the class name for structs nested in anonymous modules" do
+    m = Module.new
+    m.class_eval <<~DOC
+        Foo = Data.define(:a)
+      DOC
+
+    m::Foo.new("").to_s.should == '#<data a="">'
+  end
+
+  it "does not call #name method" do
+    struct = DataSpecs::MeasureWithOverriddenName.new(42, "km")
+    struct.to_s.should == '#<data DataSpecs::MeasureWithOverriddenName amount=42, unit="km">'
+  end
+
+  it "does not call #name method when struct is anonymous" do
+    klass = Class.new(DataSpecs::Measure) do
+      def self.name
+        "A"
+      end
+    end
+    struct = klass.new(42, "km")
+    struct.to_s.should == '#<data amount=42, unit="km">'
+  end
+
+  context "recursive structure" do
+    it "returns string representation with recursive attribute replaced with ..." do
+      a = DataSpecs::Measure.allocate
+      a.send(:initialize, amount: 42, unit: a)
+
+      a.to_s.should == "#<data DataSpecs::Measure amount=42, unit=#<data DataSpecs::Measure:...>>"
+    end
+
+    it "returns string representation with recursive attribute replaced with ... when an anonymous class" do
+      klass = Class.new(DataSpecs::Measure)
+      a = klass.allocate
+      a.send(:initialize, amount: 42, unit: a)
+
+      a.to_s.should =~ /#<data amount=42, unit=#<data #<Class:0x.+?>:\.\.\.>>/
+    end
+  end
 end