Improve assertions error messages with structured format#7444

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Evangelink wants to merge 47 commits intomainfrom

dev/amauryleve/rework-assert

Commits on Feb 22, 2026

Commits on Mar 12, 2026

Commits on Mar 19, 2026

Merge main into dev/amauryleve/rework-assert
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Remove redundant item count from fully-displayed collections
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Display null instead of (null) for null values in assertions
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Use consistent angle bracket format for type display in assertions
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Remove angle brackets around delta values in equality assertion messages
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Fix trailing newlines in test files
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Materialize non-ICollection enumerables at assertion boundary to prevent multiple enumeration
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WIP: In-progress assertion changes before refactor
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Refactor assertion error messages with structured format
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Add C# numeric type suffixes to FormatValue display
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Improve assertion messages: drop parens, specific counts, collection display
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Drop parentheses from null type display: (null) -> null
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Improve InstanceOfType messages: embed type in sentence, combine value+type
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