func assertStorageAddInContext(c *gc.C,
ctx runner.HookContext, expected map[string][]params.StorageConstraints,
) {
obtained := ctx.StorageAddConstraints()
c.Assert(len(obtained), gc.Equals, len(expected))
for k, v := range obtained {
c.Assert(v, jc.SameContents, expected[k])
}
}
