public MigrationFile(TextReader fileContents, string fileName)
{
this.Version = -1; // So that, if it isn't set by file contents, we'll make a detectably bad migration.
this._expectedSections = new List<SectionFinder>
{
new SectionFinder(0, "apply", s => this.Apply = s),
new SectionFinder(1, "insert test data", s => this.InsertTestData = s),
new SectionFinder(2, "delete test data", s => this.DeleteTestData = s),
new SectionFinder(3, "unapply", s => this.Unapply = s),
};
this._fileName = fileName;
this.Name = fileName.UpToFirst(".");
fileContents.Lines().Select(l => l.Trim()).Each(this.ParseLine);
this.FinishCurrentSection();
}