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nim-testing

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UpdatedJuly 7, 2026 at 22:09

Use when writing or updating TaTUÍ tests: TestBackend usage, golden snapshot format, layout truth-tables, the allocation invariant test, or ANSI parser fuzzing. Triggers: test, snapshot, golden, TestBackend, unittest, truth-table, allocation test, fuzz.

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invector-tecnologia

invector-tecnologia/tatui

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Software Quality Assurance Analysts and TestersComputer and Mathematical Occupations·SOC 15-1253

SKILL.md

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name	nim-testing
description	Use when writing or updating TaTUÍ tests: TestBackend usage, golden snapshot format, layout truth-tables, the allocation invariant test, or ANSI parser fuzzing. Triggers: test, snapshot, golden, TestBackend, unittest, truth-table, allocation test, fuzz.

Testing TaTUÍ

Harness

Nim unittest; every suite is imported by tests/all_tests.nim (run via nimble test).
TestBackend renders into an in-memory Buffer — assert on cells/rows without a real TTY.

Golden snapshots

Store expected renders in tests/snapshots/<name>.txt: one line per buffer row.
When styles matter, add <name>.style.txt mapping cells to a style legend.
Update goldens deliberately; call out the change in the PR/description.

Layout truth-tables

check split(area, Vertical, @[length(3), fill(1)]) == @[rect(...), rect(...)]

Cover Min/Max/Ratio/Fill interactions and integer-rounding boundaries.

Allocation invariant

test_alloc_invariant.nim: run N steady-state ticks, assert getOccupiedMem() delta == 0.

Fuzz smoke

fuzz/ansi_parser_smoke.nim: feed random/truncated escape byte streams; assert no crash and total consumption of input.

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ansi-escape-codes

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Use when working on TaTUÍ's ANSI backend or event parser: SGR styling, cursor movement, raw mode, alt screen, mouse capture, or decoding input escape sequences. Triggers: ANSI, escape sequence, SGR, CSI, termios, raw mode, alt screen, cursor move, color degradation, mouse, bracketed paste.

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constraint-layout

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Use when implementing or testing TaTUÍ's layout engine: Constraint, Rect splitting, the solver, spacing/margins, or the layout cache. Covers constraint semantics, integer rounding, and cache keying. Triggers: layout, constraint, split, rect, flex, percentage, ratio, fill, solver.

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nim-tui-architecture

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Use when working on TaTUÍ's render path: Buffer, Cell, diffing, the terminal tick loop, or backend dispatch. Covers allocation-free steady state, buffer swapping, and the immediate/retained boundary. Triggers: buffer, diff, tick, render path, allocation, swap, double buffering.

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ratatui-parity

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Use when porting any widget, layout, buffer, or backend behavior from ratatui to TaTUÍ. Covers the parity-map workflow, semantic-diff checks, and which Rust idioms NOT to copy (traits, lifetimes, CompactString, macros). Triggers: port, parity, ratatui equivalent, faithful, mirror behavior.

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unicode-width

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Use when handling text, graphemes, or cell width in TaTUÍ: Span/Line/Text, wide (CJK/emoji) characters, the cell skip flag, or grapheme segmentation. Triggers: unicode, grapheme, wide char, CJK, emoji, width, skip flag, combining, ZWJ.

2026-07-072

name	nim-testing
description	Use when writing or updating TaTUÍ tests: TestBackend usage, golden snapshot format, layout truth-tables, the allocation invariant test, or ANSI parser fuzzing. Triggers: test, snapshot, golden, TestBackend, unittest, truth-table, allocation test, fuzz.

Testing TaTUÍ

Harness

Nim unittest; every suite is imported by tests/all_tests.nim (run via nimble test).
TestBackend renders into an in-memory Buffer — assert on cells/rows without a real TTY.

Golden snapshots

Store expected renders in tests/snapshots/<name>.txt: one line per buffer row.
When styles matter, add <name>.style.txt mapping cells to a style legend.
Update goldens deliberately; call out the change in the PR/description.

Layout truth-tables

check split(area, Vertical, @[length(3), fill(1)]) == @[rect(...), rect(...)]

Cover Min/Max/Ratio/Fill interactions and integer-rounding boundaries.

Allocation invariant

test_alloc_invariant.nim: run N steady-state ticks, assert getOccupiedMem() delta == 0.

Fuzz smoke

fuzz/ansi_parser_smoke.nim: feed random/truncated escape byte streams; assert no crash and total consumption of input.