ScottPlot Unit Tests

Allowed manual test projects:

dotnet test "src/ScottPlot5/ScottPlot5 Tests/Unit Tests/ScottPlot Unit Tests.csproj"
dotnet test "src/ScottPlot5/ScottPlot5 Cookbook/ScottPlot Cookbook.csproj"

For iteration, prefer a focused NUnit filter:

dotnet test "src/ScottPlot5/ScottPlot5 Tests/Unit Tests/ScottPlot Unit Tests.csproj" --filter "FullyQualifiedName~CoordinateTests"
dotnet test "src/ScottPlot5/ScottPlot5 Cookbook/ScottPlot Cookbook.csproj" --filter "FullyQualifiedName~RecipeTests"

When adding tests, read nearby coverage first. Place tests near related code, match namespace/folder style, use NUnit [Test]/[TestCase], prefer Assert.That(...) and Assert.Multiple(...), and avoid new FluentAssertions usage. Name tests like Test_Component_Behavior. For render coverage, reuse existing helpers such as plt.Should().RenderInMemoryWithoutThrowing(), plt.Should().SavePngWithoutThrowing(), or plt.SaveTestImage(). Keep tests deterministic and focused.