open Reified
open Reified.Refinements
open Reified.Result

Compare complete data

Use exact comparison when every field and item belongs to the expected result.

open Reified
open Reified.DataDSL

let expected = data [ "name" => "Ada"; "plan" => "pro" ]
let actual = data [ "name" => "Ada"; "plan" => "free"; "extra" => true ]

Return success or differences

Data.compare returns Ok () when the trees are equal. Otherwise it returns every DataDifference.

Data.compare expected expected
// => Ok ()

Data.compare expected actual
// => Error [
//      { Path = DataPath.parse "plan"
//        Expected = Some (Data.Text "pro")
//        Actual = Some (Data.Text "free")
//        Cause = DataDifferenceCause.DifferentValue }
//      { Path = DataPath.parse "extra"
//        Expected = None
//        Actual = Some (Data.Bool true)
//        Cause = DataDifferenceCause.Unexpected }
//    ]

Return the difference list directly

Data.diff expected actual returns the same list without wrapping it in Result.

Data.diff expected expected
// => []

What exact means

Exact comparison observes:

• scalar values and scalar shapes
• number spelling, so 1, 1.0, and 1e0 differ
• list length, order, and every item
• object field order, field names, duplicate fields, and every field value

Difference causes are Missing, Unexpected, DifferentValue, DifferentShape, and DifferentFieldName. Every difference includes a path plus the expected and actual values when present.