simple load and compare tester.

.gitignore

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+/_run

run.cmd

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+rmdir /S /Q _run\repo
+
+git clone --single-branch --depth 1 https://github.com/SixLabors/ImageSharp.git --branch tocsoft/cli _run\repo
+
+dotnet restore _run\repo
+dotnet run -c release --project ".\_run\repo\src\ImageSharp.CLI\ImageSharp.CLI.csproj" tests/**/*.json

tests/OpenSaveRoundtrip.json

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+{
+  "name": "RoundTripAllImages",
+  "source": [
+      "/source/**/*.png",
+      "/source/**/*.jpeg",
+      "/source/**/*.jpg",
+      "/source/**/*.bmp",
+      "/source/**/*.gif"
+    ],
+  "actions": [
+    {
+      "$type": "DebugSave",
+      "output": "output/@(Model.FilePath.Substring(7)).png"
+    },
+    {
+      "$type": "Compare",
+      "source": "expected/@(Model.FilePath.Substring(7)).png",
+      "threshold": 0.01
+    }
+  ]
+}