Add tests for Package._fix_sha256() (#1550)
Add tests for Package._fix_sha256() (#1550)

Refs #1534
quiltdata/quilt-compiler,quiltdata/quilt,quiltdata/quilt,quiltdata/quilt-compiler,quiltdata/quilt,quiltdata/quilt-compiler,quiltdata/quilt,quiltdata/quilt-compiler,quiltdata/quilt