The asserts defined in https://github.com/xunit/assert.xunit/blob/main/SpanAsserts.cs
Contains(Span<char> expectedSubSpan, Span<char> actualSpan)Contains(Span<char> expectedSubSpan, ReadOnlySpan<char> actualSpan)Contains(ReadOnlySpan<char> expectedSubSpan, Span<char> actualSpan)Contains(ReadOnlySpan<char> expectedSubSpan, ReadOnlySpan<char> actualSpan)Contains(Span<char> expectedSubSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)Contains(Span<char> expectedSubSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)Contains(ReadOnlySpan<char> expectedSubSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)Contains(ReadOnlySpan<char> expectedSubSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)Contains<T>(Span<T> expectedSubSpan, Span<T> actualSpan)Contains<T>(Span<T> expectedSubSpan, ReadOnlySpan<T> actualSpan)Contains<T>(ReadOnlySpan<T> expectedSubSpan, Span<T> actualSpan)Contains<T>(ReadOnlySpan<T> expectedSubSpan, ReadOnlySpan<T> actualSpan)
DoesNotContain(Span<char> expectedSubSpan, Span<char> actualSpan)DoesNotContain(Span<char> expectedSubSpan, ReadOnlySpan<char> actualSpan)DoesNotContain(ReadOnlySpan<char> expectedSubSpan, Span<char> actualSpan)DoesNotContain(ReadOnlySpan<char> expectedSubSpan, ReadOnlySpan<char> actualSpan)DoesNotContain(Span<char> expectedSubSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)DoesNotContain(Span<char> expectedSubSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)DoesNotContain(ReadOnlySpan<char> expectedSubSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)DoesNotContain(ReadOnlySpan<char> expectedSubSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)DoesNotContain<T>(Span<T> expectedSubSpan, Span<T> actualSpan)DoesNotContain<T>(Span<T> expectedSubSpan, ReadOnlySpan<T> actualSpan)DoesNotContain<T>(ReadOnlySpan<T> expectedSubSpan, Span<T> actualSpan)DoesNotContain<T>(ReadOnlySpan<T> expectedSubSpan, ReadOnlySpan<T> actualSpan)
EndsWith(Span<char> expectedEndSpan, Span<char> actualSpan)EndsWith(Span<char> expectedEndSpan, ReadOnlySpan<char> actualSpan)EndsWith(ReadOnlySpan<char> expectedEndSpan, Span<char> actualSpan)EndsWith(ReadOnlySpan<char> expectedEndSpan, ReadOnlySpan<char> actualSpan)EndsWith(Span<char> expectedEndSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)EndsWith(Span<char> expectedEndSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)EndsWith(ReadOnlySpan<char> expectedEndSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)EndsWith(ReadOnlySpan<char> expectedEndSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)
Equal(Span<char> expectedSpan, Span<char> actualSpan)Equal(Span<char> expectedSpan, ReadOnlySpan<char> actualSpan)Equal(ReadOnlySpan<char> expectedSpan, Span<char> actualSpan)Equal(ReadOnlySpan<char> expectedSpan, ReadOnlySpan<char> actualSpan)Equal(Span<char> expectedSpan, Span<char> actualSpan, bool ignoreCase = false, bool ignoreLineEndingDifferences = false, bool ignoreWhiteSpaceDifferences = false, bool ignoreAllWhiteSpace = false)Equal(Span<char> expectedSpan, ReadOnlySpan<char> actualSpan, bool ignoreCase = false, bool ignoreLineEndingDifferences = false, bool ignoreWhiteSpaceDifferences = false, bool ignoreAllWhiteSpace = false)Equal(ReadOnlySpan<char> expectedSpan, Span<char> actualSpan, bool ignoreCase = false, bool ignoreLineEndingDifferences = false, bool ignoreWhiteSpaceDifferences = false, bool ignoreAllWhiteSpace = false)Equal(ReadOnlySpan<char> expectedSpan, ReadOnlySpan<char> actualSpan, bool ignoreCase = false, bool ignoreLineEndingDifferences = false, bool ignoreWhiteSpaceDifferences = false, bool ignoreAllWhiteSpace = false)Equal<T>(Span<T> expectedSpan, Span<T> actualSpan)Equal<T>(Span<T> expectedSpan, ReadOnlySpan<T> actualSpan)Equal<T>(ReadOnlySpan<T> expectedSpan, Span<T> actualSpan)Equal<T>(ReadOnlySpan<T> expectedSpan, ReadOnlySpan<T> actualSpan)
StartsWith(Span<char> expectedStartSpan, Span<char> actualSpan)StartsWith(Span<char> expectedStartSpan, ReadOnlySpan<char> actualSpan)StartsWith(ReadOnlySpan<char> expectedStartSpan, Span<char> actualSpan)StartsWith(ReadOnlySpan<char> expectedStartSpan, ReadOnlySpan<char> actualSpan)StartsWith(Span<char> expectedStartSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)StartsWith(Span<char> expectedStartSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)StartsWith(ReadOnlySpan<char> expectedStartSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)StartsWith(ReadOnlySpan<char> expectedStartSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture) 
The asserts defined in https://github.com/xunit/assert.xunit/blob/main/SpanAsserts.cs
Contains(Span<char> expectedSubSpan, Span<char> actualSpan)Contains(Span<char> expectedSubSpan, ReadOnlySpan<char> actualSpan)Contains(ReadOnlySpan<char> expectedSubSpan, Span<char> actualSpan)Contains(ReadOnlySpan<char> expectedSubSpan, ReadOnlySpan<char> actualSpan)Contains(Span<char> expectedSubSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)Contains(Span<char> expectedSubSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)Contains(ReadOnlySpan<char> expectedSubSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)Contains(ReadOnlySpan<char> expectedSubSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)Contains<T>(Span<T> expectedSubSpan, Span<T> actualSpan)Contains<T>(Span<T> expectedSubSpan, ReadOnlySpan<T> actualSpan)Contains<T>(ReadOnlySpan<T> expectedSubSpan, Span<T> actualSpan)Contains<T>(ReadOnlySpan<T> expectedSubSpan, ReadOnlySpan<T> actualSpan)DoesNotContain(Span<char> expectedSubSpan, Span<char> actualSpan)DoesNotContain(Span<char> expectedSubSpan, ReadOnlySpan<char> actualSpan)DoesNotContain(ReadOnlySpan<char> expectedSubSpan, Span<char> actualSpan)DoesNotContain(ReadOnlySpan<char> expectedSubSpan, ReadOnlySpan<char> actualSpan)DoesNotContain(Span<char> expectedSubSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)DoesNotContain(Span<char> expectedSubSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)DoesNotContain(ReadOnlySpan<char> expectedSubSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)DoesNotContain(ReadOnlySpan<char> expectedSubSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)DoesNotContain<T>(Span<T> expectedSubSpan, Span<T> actualSpan)DoesNotContain<T>(Span<T> expectedSubSpan, ReadOnlySpan<T> actualSpan)DoesNotContain<T>(ReadOnlySpan<T> expectedSubSpan, Span<T> actualSpan)DoesNotContain<T>(ReadOnlySpan<T> expectedSubSpan, ReadOnlySpan<T> actualSpan)EndsWith(Span<char> expectedEndSpan, Span<char> actualSpan)EndsWith(Span<char> expectedEndSpan, ReadOnlySpan<char> actualSpan)EndsWith(ReadOnlySpan<char> expectedEndSpan, Span<char> actualSpan)EndsWith(ReadOnlySpan<char> expectedEndSpan, ReadOnlySpan<char> actualSpan)EndsWith(Span<char> expectedEndSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)EndsWith(Span<char> expectedEndSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)EndsWith(ReadOnlySpan<char> expectedEndSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)EndsWith(ReadOnlySpan<char> expectedEndSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)Equal(Span<char> expectedSpan, Span<char> actualSpan)Equal(Span<char> expectedSpan, ReadOnlySpan<char> actualSpan)Equal(ReadOnlySpan<char> expectedSpan, Span<char> actualSpan)Equal(ReadOnlySpan<char> expectedSpan, ReadOnlySpan<char> actualSpan)Equal(Span<char> expectedSpan, Span<char> actualSpan, bool ignoreCase = false, bool ignoreLineEndingDifferences = false, bool ignoreWhiteSpaceDifferences = false, bool ignoreAllWhiteSpace = false)Equal(Span<char> expectedSpan, ReadOnlySpan<char> actualSpan, bool ignoreCase = false, bool ignoreLineEndingDifferences = false, bool ignoreWhiteSpaceDifferences = false, bool ignoreAllWhiteSpace = false)Equal(ReadOnlySpan<char> expectedSpan, Span<char> actualSpan, bool ignoreCase = false, bool ignoreLineEndingDifferences = false, bool ignoreWhiteSpaceDifferences = false, bool ignoreAllWhiteSpace = false)Equal(ReadOnlySpan<char> expectedSpan, ReadOnlySpan<char> actualSpan, bool ignoreCase = false, bool ignoreLineEndingDifferences = false, bool ignoreWhiteSpaceDifferences = false, bool ignoreAllWhiteSpace = false)Equal<T>(Span<T> expectedSpan, Span<T> actualSpan)Equal<T>(Span<T> expectedSpan, ReadOnlySpan<T> actualSpan)Equal<T>(ReadOnlySpan<T> expectedSpan, Span<T> actualSpan)Equal<T>(ReadOnlySpan<T> expectedSpan, ReadOnlySpan<T> actualSpan)StartsWith(Span<char> expectedStartSpan, Span<char> actualSpan)StartsWith(Span<char> expectedStartSpan, ReadOnlySpan<char> actualSpan)StartsWith(ReadOnlySpan<char> expectedStartSpan, Span<char> actualSpan)StartsWith(ReadOnlySpan<char> expectedStartSpan, ReadOnlySpan<char> actualSpan)StartsWith(Span<char> expectedStartSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)StartsWith(Span<char> expectedStartSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)StartsWith(ReadOnlySpan<char> expectedStartSpan, Span<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)StartsWith(ReadOnlySpan<char> expectedStartSpan, ReadOnlySpan<char> actualSpan, StringComparison comparisonType = StringComparison.CurrentCulture)