public void Proposal_ToString()
{
var proposal = new Proposal("Proposal");
Assert.AreEqual(@"Proposal { Title: ""Proposal"", Sections: [] }", proposal.ToString());
proposal.Add(new Section("Section"));
Assert.AreEqual(@"Proposal { Title: ""Proposal"", Sections: [Section { Title: ""Section"", Subsections: [] }] }", proposal.ToString());
proposal.Add(new Section("セクション2", new Subsection("第三款")));
Assert.AreEqual(@"Proposal { Title: ""Proposal"", Sections: [Section { Title: ""Section"", Subsections: [] }, Section { Title: ""セクション2"", Subsections: [Subsection { Title: ""第三款"" }] }] }", proposal.ToString());
}