Make diff generic (#26)

README.md

@@ -187,6 +187,11 @@ Observe the `OneTimeSetUp` which sets global state to enter "bulk update" mode,
 
 * The snapshot updating mechanism *requires* you to use verbatim string literals. While the test assertions will work correctly if you do `snapshot ("foo" + "bar" + f 3)`, for example, the updating code is liable to do something undefined in that case. Also do not use format strings (`$"blah"`).
 
+# Output formats
+
+* The `Diff` module provides a Patience diff and a Myers diff implementation, which you can use to make certain tests much more readable.
+* The `Dot` module provides `render`, which renders a dot file as ASCII art. You will need `graph-easy` to use this feature.
+
 # Licence
 
 MIT.

WoofWare.Expect.Test/TestDot.fs

@@ -0,0 +1,110 @@
+namespace WoofWare.Expect.Test
+
+#nowarn 0044 // This construct is deprecated
+
+open System
+open FsUnitTyped
+open WoofWare.Expect
+open NUnit.Framework
+open System.IO.Abstractions
+open System.IO.Abstractions.TestingHelpers
+
+[<TestFixture>]
+module TestDot =
+    let toFs (fs : IFileSystem) : Dot.IFileSystem =
+        { new Dot.IFileSystem with
+            member _.DeleteFile s = fs.File.Delete s
+            member _.WriteFile path contents = fs.File.WriteAllText (path, contents)
+            member _.GetTempFileName () = fs.Path.GetTempFileName ()
+        }
+
+    [<Test ; Explicit "requires graph-easy dependency">]
+    let ``Basic dotfile, real graph-easy`` () =
+        let s =
+            """digraph G {
+  rankdir = TB
+  bgcolor = transparent
+    n2 [shape=box label="{{n2|Map|height=1}}" ]
+    n1 [shape=box label="{{n1|Const|height=0}}" ]
+  n1 -> n2
+}"""
+
+        expect {
+            snapshot
+                @"
+┌───────────────────────┐
+│ {{n1|Const|height=0}} │
+└───────────────────────┘
+  │
+  │
+  ▼
+┌───────────────────────┐
+│  {{n2|Map|height=1}}  │
+└───────────────────────┘
+"
+
+            return Dot.render s
+        }
+
+    [<Test>]
+    let ``Basic dotfile`` () =
+        let fs = MockFileSystem ()
+
+        let contents =
+            """digraph G {
+  rankdir = TB
+  bgcolor = transparent
+    n2 [shape=box label="{{n2|Map|height=1}}" ]
+    n1 [shape=box label="{{n1|Const|height=0}}" ]
+  n1 -> n2
+}"""
+
+        let mutable started = false
+        let mutable waited = false
+        let mutable exitCodeObserved = false
+        let mutable disposed = false
+
+        let expected =
+            "┌───────────────────────┐
+│ {{n1|Const|height=0}} │
+└───────────────────────┘
+  │
+  │
+  ▼
+┌───────────────────────┐
+│  {{n2|Map|height=1}}  │
+└───────────────────────┘
+"
+
+        let pr =
+            { new Dot.IProcess<IDisposable> with
+                member _.Start _ =
+                    started <- true
+                    true
+
+                member _.Create exe args =
+                    exe |> shouldEqual "graph-easy"
+
+                    args.StartsWith ("--as=boxart --from=dot ", StringComparison.Ordinal)
+                    |> shouldEqual true
+
+                    { new IDisposable with
+                        member _.Dispose () = disposed <- true
+                    }
+
+                member _.WaitForExit p = waited <- true
+                member _.ReadStandardOutput _ = expected
+
+                member _.ExitCode _ =
+                    exitCodeObserved <- true
+                    0
+            }
+
+        Dot.render' pr (toFs fs) "graph-easy" contents
+        |> _.TrimStart()
+        |> shouldEqual expected
+
+        started |> shouldEqual true
+        waited |> shouldEqual true
+        exitCodeObserved |> shouldEqual true
+        disposed |> shouldEqual true

WoofWare.Expect.Test/WoofWare.Expect.Test.fsproj

@@ -14,6 +14,7 @@
       <Compile Include="BulkUpdateExample.fs" />
       <Compile Include="SimpleTest.fs" />
       <Compile Include="TestDiff.fs" />
+      <Compile Include="TestDot.fs" />
       <Compile Include="TestExceptionThrowing.fs" />
       <Compile Include="TestSurface.fs" />
       <Compile Include="TestSnapshotFinding\TestSnapshotFinding.fs" />
@@ -40,6 +41,9 @@
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1"/>
         <PackageReference Include="NUnit" Version="4.3.2"/>
         <PackageReference Include="NUnit3TestAdapter" Version="5.0.0"/>
+      <!-- TODO: when ApiSurface accepts https://github.com/G-Research/ApiSurface/pull/116, upgrade these -->
+        <PackageReference Include="System.IO.Abstractions" Version="4.2.13" />
+        <PackageReference Include="System.IO.Abstractions.TestingHelpers" Version="4.2.13" />
     </ItemGroup>
 
     <ItemGroup>

WoofWare.Expect/Diff.fs

@@ -11,45 +11,50 @@ type Position = int<pos>
 
 /// A Patience diff is composed of a sequence of transformations to get from one string to another.
 /// This represents those transformations.
-type DiffOperation =
+type DiffOperation<'line> =
     /// This line is the same on both sides of the diff.
     /// On the left, it appears at position posA. On the right, at position posB.
-    | Match of posA : Position * posB : Position * line : string
+    | Match of posA : Position * posB : Position * line : 'line
     /// Delete this line, which is at this position.
-    | Delete of posA : Position * line : string
+    | Delete of posA : Position * line : 'line
     /// Insert this line at the given position.
-    | Insert of posB : Position * line : string
+    | Insert of posB : Position * line : 'line
+
+/// The diff between two line-oriented streams. Normally the generic parameter will be `string`, indicating
+/// that the thing being diffed was text.
+type Diff'<'line> = private | Diff of DiffOperation<'line> list
 
 /// The diff between two line-oriented pieces of text.
-type Diff = private | Diff of DiffOperation list
+type Diff = Diff'<string>
 
 /// A match between positions in two sequences
-type internal LineMatch =
+type internal LineMatch<'line> =
     {
         PosA : Position
         PosB : Position
-        Line : string
+        Line : 'line
     }
 
 /// Result of finding unique lines in a sequence
-type internal UniqueLines =
+type internal UniqueLines<'line when 'line : comparison> =
     {
         /// Map from line content to its position (only for unique lines)
-        LinePositions : Map<string, Position>
+        LinePositions : Map<'line, Position>
         /// All line counts (for verification)
-        LineCounts : Map<string, int>
+        LineCounts : Map<'line, int>
     }
 
+/// The diff between two line-oriented pieces of text.
 [<RequireQualifiedAccess>]
 module Diff =
     /// Find lines that appear exactly once in a sequence
-    let private findUniqueLines (lines : string array) : UniqueLines =
-        let positions = Dictionary<string, Position> ()
-        let counts = Dictionary<string, int> ()
+    let private findUniqueLines (lines : 'line array) : UniqueLines<'line> =
+        let positions = Dictionary<'line, Position> ()
+        let counts = Dictionary<'line, int> ()
 
         lines
         |> Array.iteri (fun i line ->
-            if counts.ContainsKey (line) then
+            if counts.ContainsKey line then
                 counts.[line] <- counts.[line] + 1
             else
                 counts.[line] <- 1
@@ -70,7 +75,7 @@ module Diff =
         }
 
     /// Find longest increasing subsequence based on B positions
-    let private longestIncreasingSubsequence (matches : LineMatch array) : LineMatch list =
+    let private longestIncreasingSubsequence (matches : LineMatch<'line> array) : LineMatch<'line> list =
         let n = matches.Length
 
         if n = 0 then
@@ -103,9 +108,8 @@ module Diff =
 
             reconstruct endIndex []
 
-    /// Simple Myers diff implementation. You probably want to use `patience` instead, for more human-readable diffs.
-    let myers (a : string array) (b : string array) : Diff =
-        let rec diffHelper (i : int) (j : int) (acc : DiffOperation list) =
+    let private myers' (a : 'line array) (b : 'line array) : DiffOperation<'line> list =
+        let rec diffHelper (i : int) (j : int) (acc : DiffOperation<'line> list) =
             match i < a.Length, j < b.Length with
             | false, false -> List.rev acc
             | true, false ->
@@ -146,11 +150,14 @@ module Diff =
                         // No close match, just delete and insert
                         diffHelper (i + 1) j (Delete (i * 1<pos>, a.[i]) :: acc)
 
-        diffHelper 0 0 [] |> Diff
+        diffHelper 0 0 []
+
+    /// Simple Myers diff implementation. You probably want to use `patience` instead, for more human-readable diffs.
+    let myers (a : string array) (b : string array) : Diff = myers' a b |> Diff
 
     /// Patience diff: a human-readable line-based diff.
     /// Operates on lines of string; the function `patience` will split on lines for you.
-    let rec patienceLines (a : string array) (b : string array) : Diff =
+    let rec patienceLines (a : 'line array) (b : 'line array) : Diff'<'line> =
         // Handle empty sequences
         match a.Length, b.Length with
         | 0, 0 -> [] |> Diff
@@ -177,7 +184,7 @@ module Diff =
 
             if Set.isEmpty commonUniques then
                 // No unique common lines, fall back to Myers
-                myers a b
+                myers' a b |> Diff
             else
                 // Build matches for unique common lines
                 let matches =
@@ -196,7 +203,7 @@ module Diff =
                 let anchorMatches = longestIncreasingSubsequence matches |> List.toArray
 
                 // Build diff imperatively
-                let result = ResizeArray<DiffOperation> ()
+                let result = ResizeArray<DiffOperation<_>> ()
                 let mutable prevA = 0<pos>
                 let mutable prevB = 0<pos>
 
@@ -244,26 +251,32 @@ module Diff =
         patienceLines (a.Split '\n') (b.Split '\n')
 
     /// Format the diff as a human-readable string, including line numbers at the left.
-    let formatWithLineNumbers (Diff ops) : string =
+    let formatWithLineNumbers' (formatter : 'line -> string) (Diff ops) : string =
         ops
         |> List.map (fun op ->
             match op with
-            | Match (a, b, line) -> sprintf "  %3d %3d  %s" a b line
-            | Delete (a, line) -> sprintf "- %3d      %s" a line
-            | Insert (b, line) -> sprintf "+     %3d  %s" b line
+            | Match (a, b, line) -> sprintf "  %3d %3d  %s" a b (formatter line)
+            | Delete (a, line) -> sprintf "- %3d      %s" a (formatter line)
+            | Insert (b, line) -> sprintf "+     %3d  %s" b (formatter line)
+        )
+        |> String.concat "\n"
+
+    /// Format the diff as a human-readable string, including line numbers at the left.
+    let formatWithLineNumbers (d : Diff) : string = formatWithLineNumbers' id d
+
+    /// Format the diff as a human-readable string.
+    let format' (formatter : 'line -> string) (Diff ops) : string =
+        ops
+        |> List.map (fun op ->
+            match op with
+            | Match (_, _, line) -> "  " + (formatter line)
+            | Delete (_, line) -> "- " + (formatter line)
+            | Insert (_, line) -> "+ " + (formatter line)
         )
         |> String.concat "\n"
 
     /// Format the diff as a human-readable string.
-    let format (Diff ops) : string =
-        ops
-        |> List.map (fun op ->
-            match op with
-            | Match (_, _, line) -> sprintf "  %s" line
-            | Delete (_, line) -> sprintf "- %s" line
-            | Insert (_, line) -> sprintf "+ %s" line
-        )
-        |> String.concat "\n"
+    let format (ops : Diff) : string = format' id ops
 
     /// Compute diff statistics
     type internal DiffStats =
@@ -274,7 +287,7 @@ module Diff =
             TotalOperations : int
         }
 
-    let internal computeStats (ops : DiffOperation list) : DiffStats =
+    let internal computeStats (ops : DiffOperation<'a> list) : DiffStats =
         let counts =
             ops
             |> List.fold

WoofWare.Expect/Dot.fs

@@ -0,0 +1,91 @@
+namespace WoofWare.Expect
+
+open System
+open System.Diagnostics
+open System.IO
+
+/// Methods for rendering dot files (specifications of graphs).
+[<RequireQualifiedAccess>]
+module Dot =
+    /// A mock for System.Diagnostics.Process.
+    type IProcess<'Process when 'Process :> IDisposable> =
+        /// Equivalent to Process.Create
+        abstract Create : exe : string -> args : string -> 'Process
+        /// Equivalent to Process.Start
+        abstract Start : 'Process -> bool
+        /// Equivalent to Process.WaitForExit
+        abstract WaitForExit : 'Process -> unit
+        /// Equivalent to Process.StandardOutput.ReadToEnd
+        abstract ReadStandardOutput : 'Process -> string
+        /// Equivalent to Process.ExitCode
+        abstract ExitCode : 'Process -> int
+
+    /// The real Process interface, in a form that can be passed to `render'`.
+    let process' =
+        { new IProcess<Process> with
+            member _.Create exe args =
+                let psi = ProcessStartInfo exe
+                psi.RedirectStandardOutput <- true
+                psi.Arguments <- args
+                let result = new Process ()
+                result.StartInfo <- psi
+                result
+
+            member _.Start p = p.Start ()
+            member _.WaitForExit p = p.WaitForExit ()
+            member _.ReadStandardOutput p = p.StandardOutput.ReadToEnd ()
+            member _.ExitCode p = p.ExitCode
+        }
+
+    /// A mock for System.IO
+    type IFileSystem =
+        /// Equivalent to Path.GetTempFileName
+        abstract GetTempFileName : unit -> string
+        /// Equivalent to File.Delete
+        abstract DeleteFile : string -> unit
+        /// Equivalent to File.WriteAllText (curried)
+        abstract WriteFile : path : string -> contents : string -> unit
+
+    /// The real filesystem, in a form that can be passed to `render'`.
+    let fileSystem =
+        { new IFileSystem with
+            member _.GetTempFileName () = Path.GetTempFileName ()
+            member _.DeleteFile f = File.Delete f
+            member _.WriteFile path contents = File.WriteAllText (path, contents)
+        }
+
+    /// writeFile takes the filepath first and the contents second.
+    /// Due to the impoverished nature of the .NET Standard APIs, you are in charge of making sure the output of
+    /// fs.GetTempFileName is suitable for interpolation into a command line.
+    let render'<'Process when 'Process :> IDisposable>
+        (pr : IProcess<'Process>)
+        (fs : IFileSystem)
+        (graphEasyExecutable : string)
+        (dotFileContents : string)
+        : string
+        =
+        let tempFile = fs.GetTempFileName ()
+
+        try
+            fs.WriteFile tempFile dotFileContents
+
+            use p = pr.Create graphEasyExecutable ("--as=boxart --from=dot " + tempFile)
+            pr.Start p |> ignore<bool>
+            pr.WaitForExit p
+
+            let stdout = pr.ReadStandardOutput p
+            let exitCode = pr.ExitCode p
+
+            if exitCode <> 0 then
+                failwithf "failed to run; exit code: %i. stdout:\n%s" exitCode stdout
+
+            "\n" + stdout
+        finally
+            try
+                fs.DeleteFile tempFile
+            with _ ->
+                ()
+
+    /// Call `graph-easy` to render the dotfile as ASCII art.
+    /// This is fully mockable, but you must use `render'` to do so.
+    let render = render' process' fileSystem "graph-easy"

WoofWare.Expect/SurfaceBaseline.txt

@@ -8,48 +8,68 @@ WoofWare.Expect.CallerInfo inherit obj, implements WoofWare.Expect.CallerInfo Sy
 WoofWare.Expect.CallerInfo.Equals [method]: (WoofWare.Expect.CallerInfo, System.Collections.IEqualityComparer) -> bool
 WoofWare.Expect.CompletedSnapshot inherit obj, implements WoofWare.Expect.CompletedSnapshot System.IEquatable, System.Collections.IStructuralEquatable, WoofWare.Expect.CompletedSnapshot System.IComparable, System.IComparable, System.Collections.IStructuralComparable
 WoofWare.Expect.CompletedSnapshot.Equals [method]: (WoofWare.Expect.CompletedSnapshot, System.Collections.IEqualityComparer) -> bool
-WoofWare.Expect.Diff inherit obj, implements WoofWare.Expect.Diff System.IEquatable, System.Collections.IStructuralEquatable, WoofWare.Expect.Diff System.IComparable, System.IComparable, System.Collections.IStructuralComparable
-WoofWare.Expect.Diff.Equals [method]: (WoofWare.Expect.Diff, System.Collections.IEqualityComparer) -> bool
+WoofWare.Expect.Diff'`1 inherit obj, implements 'line WoofWare.Expect.Diff' System.IEquatable, System.Collections.IStructuralEquatable, 'line WoofWare.Expect.Diff' System.IComparable, System.IComparable, System.Collections.IStructuralComparable
+WoofWare.Expect.Diff'`1.Equals [method]: ('line WoofWare.Expect.Diff', System.Collections.IEqualityComparer) -> bool
 WoofWare.Expect.DiffModule inherit obj
-WoofWare.Expect.DiffModule.format [static method]: WoofWare.Expect.Diff -> string
-WoofWare.Expect.DiffModule.formatWithLineNumbers [static method]: WoofWare.Expect.Diff -> string
-WoofWare.Expect.DiffModule.myers [static method]: string [] -> string [] -> WoofWare.Expect.Diff
-WoofWare.Expect.DiffModule.patience [static method]: string -> string -> WoofWare.Expect.Diff
-WoofWare.Expect.DiffModule.patienceLines [static method]: string [] -> string [] -> WoofWare.Expect.Diff
-WoofWare.Expect.DiffOperation inherit obj, implements WoofWare.Expect.DiffOperation System.IEquatable, System.Collections.IStructuralEquatable, WoofWare.Expect.DiffOperation System.IComparable, System.IComparable, System.Collections.IStructuralComparable - union type with 3 cases
-WoofWare.Expect.DiffOperation+Delete inherit WoofWare.Expect.DiffOperation
-WoofWare.Expect.DiffOperation+Delete.get_line [method]: unit -> string
-WoofWare.Expect.DiffOperation+Delete.get_posA [method]: unit -> int
-WoofWare.Expect.DiffOperation+Delete.line [property]: [read-only] string
-WoofWare.Expect.DiffOperation+Delete.posA [property]: [read-only] int
-WoofWare.Expect.DiffOperation+Insert inherit WoofWare.Expect.DiffOperation
-WoofWare.Expect.DiffOperation+Insert.get_line [method]: unit -> string
-WoofWare.Expect.DiffOperation+Insert.get_posB [method]: unit -> int
-WoofWare.Expect.DiffOperation+Insert.line [property]: [read-only] string
-WoofWare.Expect.DiffOperation+Insert.posB [property]: [read-only] int
-WoofWare.Expect.DiffOperation+Match inherit WoofWare.Expect.DiffOperation
-WoofWare.Expect.DiffOperation+Match.get_line [method]: unit -> string
-WoofWare.Expect.DiffOperation+Match.get_posA [method]: unit -> int
-WoofWare.Expect.DiffOperation+Match.get_posB [method]: unit -> int
-WoofWare.Expect.DiffOperation+Match.line [property]: [read-only] string
-WoofWare.Expect.DiffOperation+Match.posA [property]: [read-only] int
-WoofWare.Expect.DiffOperation+Match.posB [property]: [read-only] int
-WoofWare.Expect.DiffOperation+Tags inherit obj
-WoofWare.Expect.DiffOperation+Tags.Delete [static field]: int = 1
-WoofWare.Expect.DiffOperation+Tags.Insert [static field]: int = 2
-WoofWare.Expect.DiffOperation+Tags.Match [static field]: int = 0
-WoofWare.Expect.DiffOperation.Equals [method]: (WoofWare.Expect.DiffOperation, System.Collections.IEqualityComparer) -> bool
-WoofWare.Expect.DiffOperation.get_IsDelete [method]: unit -> bool
-WoofWare.Expect.DiffOperation.get_IsInsert [method]: unit -> bool
-WoofWare.Expect.DiffOperation.get_IsMatch [method]: unit -> bool
-WoofWare.Expect.DiffOperation.get_Tag [method]: unit -> int
-WoofWare.Expect.DiffOperation.IsDelete [property]: [read-only] bool
-WoofWare.Expect.DiffOperation.IsInsert [property]: [read-only] bool
-WoofWare.Expect.DiffOperation.IsMatch [property]: [read-only] bool
-WoofWare.Expect.DiffOperation.NewDelete [static method]: (int, string) -> WoofWare.Expect.DiffOperation
-WoofWare.Expect.DiffOperation.NewInsert [static method]: (int, string) -> WoofWare.Expect.DiffOperation
-WoofWare.Expect.DiffOperation.NewMatch [static method]: (int, int, string) -> WoofWare.Expect.DiffOperation
-WoofWare.Expect.DiffOperation.Tag [property]: [read-only] int
+WoofWare.Expect.DiffModule.format [static method]: string WoofWare.Expect.Diff' -> string
+WoofWare.Expect.DiffModule.format' [static method]: ('line -> string) -> 'line WoofWare.Expect.Diff' -> string
+WoofWare.Expect.DiffModule.formatWithLineNumbers [static method]: string WoofWare.Expect.Diff' -> string
+WoofWare.Expect.DiffModule.formatWithLineNumbers' [static method]: ('line -> string) -> 'line WoofWare.Expect.Diff' -> string
+WoofWare.Expect.DiffModule.myers [static method]: string [] -> string [] -> string WoofWare.Expect.Diff'
+WoofWare.Expect.DiffModule.patience [static method]: string -> string -> string WoofWare.Expect.Diff'
+WoofWare.Expect.DiffModule.patienceLines [static method]: 'line [] -> 'line [] -> 'line WoofWare.Expect.Diff'
+WoofWare.Expect.DiffOperation`1 inherit obj, implements 'line WoofWare.Expect.DiffOperation System.IEquatable, System.Collections.IStructuralEquatable, 'line WoofWare.Expect.DiffOperation System.IComparable, System.IComparable, System.Collections.IStructuralComparable - union type with 3 cases
+WoofWare.Expect.DiffOperation`1+Delete inherit 'line WoofWare.Expect.DiffOperation
+WoofWare.Expect.DiffOperation`1+Delete.get_line [method]: unit -> 'line
+WoofWare.Expect.DiffOperation`1+Delete.get_posA [method]: unit -> int
+WoofWare.Expect.DiffOperation`1+Delete.line [property]: [read-only] 'line
+WoofWare.Expect.DiffOperation`1+Delete.posA [property]: [read-only] int
+WoofWare.Expect.DiffOperation`1+Insert inherit 'line WoofWare.Expect.DiffOperation
+WoofWare.Expect.DiffOperation`1+Insert.get_line [method]: unit -> 'line
+WoofWare.Expect.DiffOperation`1+Insert.get_posB [method]: unit -> int
+WoofWare.Expect.DiffOperation`1+Insert.line [property]: [read-only] 'line
+WoofWare.Expect.DiffOperation`1+Insert.posB [property]: [read-only] int
+WoofWare.Expect.DiffOperation`1+Match inherit 'line WoofWare.Expect.DiffOperation
+WoofWare.Expect.DiffOperation`1+Match.get_line [method]: unit -> 'line
+WoofWare.Expect.DiffOperation`1+Match.get_posA [method]: unit -> int
+WoofWare.Expect.DiffOperation`1+Match.get_posB [method]: unit -> int
+WoofWare.Expect.DiffOperation`1+Match.line [property]: [read-only] 'line
+WoofWare.Expect.DiffOperation`1+Match.posA [property]: [read-only] int
+WoofWare.Expect.DiffOperation`1+Match.posB [property]: [read-only] int
+WoofWare.Expect.DiffOperation`1+Tags inherit obj
+WoofWare.Expect.DiffOperation`1+Tags.Delete [static field]: int = 1
+WoofWare.Expect.DiffOperation`1+Tags.Insert [static field]: int = 2
+WoofWare.Expect.DiffOperation`1+Tags.Match [static field]: int = 0
+WoofWare.Expect.DiffOperation`1.Equals [method]: ('line WoofWare.Expect.DiffOperation, System.Collections.IEqualityComparer) -> bool
+WoofWare.Expect.DiffOperation`1.get_IsDelete [method]: unit -> bool
+WoofWare.Expect.DiffOperation`1.get_IsInsert [method]: unit -> bool
+WoofWare.Expect.DiffOperation`1.get_IsMatch [method]: unit -> bool
+WoofWare.Expect.DiffOperation`1.get_Tag [method]: unit -> int
+WoofWare.Expect.DiffOperation`1.IsDelete [property]: [read-only] bool
+WoofWare.Expect.DiffOperation`1.IsInsert [property]: [read-only] bool
+WoofWare.Expect.DiffOperation`1.IsMatch [property]: [read-only] bool
+WoofWare.Expect.DiffOperation`1.NewDelete [static method]: (int, 'line) -> 'line WoofWare.Expect.DiffOperation
+WoofWare.Expect.DiffOperation`1.NewInsert [static method]: (int, 'line) -> 'line WoofWare.Expect.DiffOperation
+WoofWare.Expect.DiffOperation`1.NewMatch [static method]: (int, int, 'line) -> 'line WoofWare.Expect.DiffOperation
+WoofWare.Expect.DiffOperation`1.Tag [property]: [read-only] int
+WoofWare.Expect.Dot inherit obj
+WoofWare.Expect.Dot+IFileSystem - interface with 3 member(s)
+WoofWare.Expect.Dot+IFileSystem.DeleteFile [method]: string -> unit
+WoofWare.Expect.Dot+IFileSystem.GetTempFileName [method]: unit -> string
+WoofWare.Expect.Dot+IFileSystem.WriteFile [method]: string -> string -> unit
+WoofWare.Expect.Dot+IProcess`1 - interface with 5 member(s)
+WoofWare.Expect.Dot+IProcess`1.Create [method]: string -> string -> #(IDisposable)
+WoofWare.Expect.Dot+IProcess`1.ExitCode [method]: #(IDisposable) -> int
+WoofWare.Expect.Dot+IProcess`1.ReadStandardOutput [method]: #(IDisposable) -> string
+WoofWare.Expect.Dot+IProcess`1.Start [method]: #(IDisposable) -> bool
+WoofWare.Expect.Dot+IProcess`1.WaitForExit [method]: #(IDisposable) -> unit
+WoofWare.Expect.Dot.fileSystem [static property]: [read-only] WoofWare.Expect.Dot+IFileSystem
+WoofWare.Expect.Dot.get_fileSystem [static method]: unit -> WoofWare.Expect.Dot+IFileSystem
+WoofWare.Expect.Dot.get_process' [static method]: unit -> System.Diagnostics.Process WoofWare.Expect.Dot+IProcess
+WoofWare.Expect.Dot.get_render [static method]: unit -> (string -> string)
+WoofWare.Expect.Dot.process' [static property]: [read-only] System.Diagnostics.Process WoofWare.Expect.Dot+IProcess
+WoofWare.Expect.Dot.render [static property]: [read-only] string -> string
+WoofWare.Expect.Dot.render' [static method]: #(IDisposable) WoofWare.Expect.Dot+IProcess -> WoofWare.Expect.Dot+IFileSystem -> string -> string -> string
 WoofWare.Expect.ExpectBuilder inherit obj
 WoofWare.Expect.ExpectBuilder..ctor [constructor]: (string * int)
 WoofWare.Expect.ExpectBuilder..ctor [constructor]: bool

WoofWare.Expect/WoofWare.Expect.fsproj

@@ -20,6 +20,7 @@
         <Compile Include="Text.fs" />
         <Compile Include="File.fs" />
         <Compile Include="Diff.fs" />
+        <Compile Include="Dot.fs" />
         <Compile Include="Domain.fs" />
         <Compile Include="SnapshotUpdate.fs" />
         <Compile Include="Config.fs" />

WoofWare.Expect/version.json

@@ -1,5 +1,5 @@
 {
-  "version": "0.5",
+  "version": "0.7",
   "publicReleaseRefSpec": [
     "^refs/heads/main$"
   ],
@@ -10,4 +10,4 @@
     ":/Directory.Build.props",
     ":/LICENSE"
   ]
-}
+}

flake.nix

@@ -66,6 +66,7 @@
           pkgs.nodePackages.markdown-link-check
           pkgs.shellcheck
           pkgs.xmlstarlet
+          pkgs.graph-easy
         ];
       };
     });

nix/deps.json

@@ -189,6 +189,11 @@
     "version": "4.2.13",
     "hash": "sha256-nkC/PiqE6+c1HJ2yTwg3x+qdBh844Z8n3ERWDW8k6Gg="
   },
+  {
+    "pname": "System.IO.Abstractions.TestingHelpers",
+    "version": "4.2.13",
+    "hash": "sha256-WGGatXlgyROnptdw0zU3ggf54eD/zusO/fvtf+5wuPU="
+  },
   {
     "pname": "System.IO.FileSystem.AccessControl",
     "version": "4.5.0",