85 lines
4.5 KiB
Markdown
85 lines
4.5 KiB
Markdown
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# Image generation test plan — ImageSharp-only (multiplatform)
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Goal
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-----
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Create an automated, cross-platform test project that validates `ImageCreatorImageSharp` behavior by generating synthetic input images and pixel-inspecting outputs produced by the library.
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Decisions
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---------
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- Test only `ImageCreatorImageSharp` (multiplatform).
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- Test project targets `net10.0` (not Windows-only) and uses SixLabors.ImageSharp for both generation and verification; avoid `System.Drawing.Common` in tests.
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- Inputs are programmatically generated images (no checked-in large binaries).
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- Verification uses pixel inspection (sample regions, color averages, non-background pixel counts).
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Project
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-------
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- Name: `MaddoShared.ImageSharpTests` (folder: `MaddoShared.ImageSharpTests/`)
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- TargetFramework: `net10.0` (no Windows-only flags)
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- Package references:
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- `MSTest.TestFramework` / `MSTest.TestAdapter` / `Microsoft.NET.Test.Sdk`
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- `FluentAssertions`
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- `Moq` (if needed for loggers)
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- `SixLabors.ImageSharp` and `SixLabors.ImageSharp.Drawing` (for image creation and pixel inspection)
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- `Microsoft.Extensions.Logging.Abstractions` (lightweight logging)
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- ProjectReference: `../MaddoShared/MaddoShared.csproj`
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Helpers (tests)
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----------------
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- `TempWorkspace` — creates temporary `Source` and `Dest` folders, cleans up on dispose.
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- `TestImageFactory` — creates synthetic JPEG/PNG inputs and in-memory logo PNG bytes. Also can write EXIF orientation values.
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- `PixelInspector` — loads output using ImageSharp and exposes:
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- `CountNonBackgroundPixels(path, Rectangle region, Rgba32 background, int tolerance)`
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- `SampleAverageColor(path, Rectangle region)`
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- Region helpers: top/bottom/left/right/center/quadrant rectangles for given image sizes
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- `CreatorFactory` — builds `PicSettings` defaults and `ImageCreatorImageSharp` instances.
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Test cases (high-level)
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-----------------------
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1. Image resizing: verify big and small output dimensions respect settings.
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2. Text positioning: for `Posizione` = ALTO/CENTRO/BASSO and `Allineamento` = SINISTRA/CENTRO/DESTRA assert text pixels appear in expected regions.
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3. Text content: baseline (empty) vs non-empty comparisons to ensure text changes output; EXIF-vertical photo selects `TestoFirmaV`.
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4. Logo positioning: use a solid-color logo (e.g., pure red PNG) and verify red pixels appear in the expected quadrant for combinations of `LogoPosizioneH` × `LogoPosizioneV` and with margins (absolute and percentage).
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5. Logo features: opacity (logo color blending) and color-key transparency.
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6. EXIF orientation: ensure rotation is applied and output contains no EXIF orientation tag.
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Verification approach
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---------------------
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- For text: compare non-background pixel count in the target band vs opposite band (thresholded) to avoid brittle exact glyph placement checks.
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- For logo: sample the quadrant where the logo should be; count logo-colored pixels and assert above threshold.
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- For opacity: sample average color in logo region and assert it is blended when opacity <100%.
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Scope boundaries
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----------------
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- In scope: `ImageCreatorImageSharp` behavior: resize, EXIF rotation, text presence/position, logo position/opactiy, thumbnails.
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- Out of scope: `ImageCreatorGDI` (excluded), OCR verification of exact text glyphs, font-subpixel metrics, performance testing.
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Implementation notes
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--------------------
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- Keep tests deterministic by creating solid-color inputs and simple logos.
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- Use modest image sizes (e.g., 800×600) so tests run fast.
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- Carefully choose thresholds for pixel-count assertions to be robust across fonts and rendering differences.
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Run & validate
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---------------
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- Build: `dotnet build MaddoShared.ImageSharpTests`
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- Test: `dotnet test MaddoShared.ImageSharpTests`
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Files to add
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------------
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- `MaddoShared.ImageSharpTests/MaddoShared.ImageSharpTests.csproj`
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- `MaddoShared.ImageSharpTests/Helpers/TempWorkspace.cs`
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- `MaddoShared.ImageSharpTests/Helpers/TestImageFactory.cs`
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- `MaddoShared.ImageSharpTests/Helpers/PixelInspector.cs`
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- `MaddoShared.ImageSharpTests/Helpers/CreatorFactory.cs`
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- `MaddoShared.ImageSharpTests/Tests/ImageResizingTests.cs`
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- `MaddoShared.ImageSharpTests/Tests/TextPositioningTests.cs`
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- `MaddoShared.ImageSharpTests/Tests/LogoPositioningTests.cs`
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- `MaddoShared.ImageSharpTests/Tests/ExifOrientationTests.cs`
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- `docs/image-generation-tests-plan.md` (this file)
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Next steps
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----------
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1. Create the `MaddoShared.ImageSharpTests` project and add the helper files.
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2. Implement the first set of tests (resizing + a simple text presence test) to validate the testing harness.
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3. Iterate thresholds and add remaining tests.
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