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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) #772

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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe)#772
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@Chemaclass
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opened on Jul 12, 2026

Part of #761.

Problem

The assertion layer still forks avoidable subshells on its hottest paths (measured on macOS bash 3.2, Apple Silicon, commit 1ae3e82):

  1. assert_equals/assert_not_equals fork twice per call, even on success.src/assert.sh:159,161 and src/assert.sh:182,184 capture bashunit::str::strip_ansi with $(...). strip_ansi (src/str.sh:4) already has a pure-bash fast path for plain input, but callers still pay the command-substitution fork to read it. Measured: a file with 1000 assert_equals runs in ~1.45s vs ~0.68s for the trivial baseline, i.e. ~0.77ms extra per assertion.
  2. Failure-path label resolution forks 2-3 more times per failing assertion.bashunit::assert::label (src/assert.sh:15) captures find_test_function_name via $(...) and is itself always captured via $(...) at every call site; bashunit::handle_bool_assertion_failure (src/assert.sh:120) and bashunit::fail (src/assert.sh:26) repeat the same nested-capture pattern.
  3. bashunit::run_command_or_eval forks a pipeline per non-literal assert_true/assert_false.src/assert.sh:111 runs $(command -v "$cmd" | "$GREP" -cE '^alias') just to detect an alias.

Task — checklist, one commit each

  • Add a return-slot variant of strip_ansi (e.g. bashunit::str::strip_ansi_to_slot writing _BASHUNIT_STR_STRIPPED_OUT, per .claude/rules/bash-style.md), whose no-ANSI fast path sets the global with zero forks. Convert assert_equals and assert_not_equals to it. Keep the echoing strip_ansi as a thin wrapper for any other callers.
  • Convert bashunit::assert::label, bashunit::handle_bool_assertion_failure, and bashunit::fail to return slots: add slot variants of bashunit::helper::find_test_function_name (src/helpers.sh:14) and bashunit::helper::normalize_test_function_name (src/helpers.sh:40), then update all label="$(bashunit::assert::label ...)" call sites in src/assert.sh.
  • Replace the alias probe at src/assert.sh:111 with a fork-free builtin check, e.g. if alias -- "$cmd" >/dev/null 2>&1; then eval .... Verify equivalence: for functions/binaries/nonexistent commands alias exits non-zero, matching the current command -v | grep -c '^alias' result. Cover with a unit test that defines an alias (requires shopt -s expand_aliases in the test) and one that uses a function.

Tests first (TDD)

Behavior must not change; the existing suite is the spec. Add a regression test for each new return-slot helper: call it with one of its own internal variable names (dynamic-scoping trap documented in .claude/rules/bash-style.md, bug precedent PR #672).

Constraints

  • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no printf -v (3.1+).
  • Console output must remain byte-identical (snapshot/acceptance tests will catch drift).

Acceptance criteria

  • ./bashunit tests/ and ./bashunit --parallel tests/ pass after every commit.
  • make sa, make lint pass; shfmt -w . produces no diff.
  • Report before/after timing of a 100-test x 10 assert_equals file in the PR (baseline above).

Line references valid at commit 1ae3e82.

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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) · Issue #772 · TypedDevs/bashunit · GitHub
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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) #772
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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe)#772
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enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Jul 12, 2026
Part of #761.
Problem
The assertion layer still forks avoidable subshells on its hottest paths (measured on macOS bash 3.2, Apple Silicon, commit 1ae3e82):
  1. assert_equals/assert_not_equals fork twice per call, even on success.src/assert.sh:159,161 and src/assert.sh:182,184 capture bashunit::str::strip_ansi with $(...). strip_ansi (src/str.sh:4) already has a pure-bash fast path for plain input, but callers still pay the command-substitution fork to read it. Measured: a file with 1000 assert_equals runs in ~1.45s vs ~0.68s for the trivial baseline, i.e. ~0.77ms extra per assertion.
  2. Failure-path label resolution forks 2-3 more times per failing assertion.bashunit::assert::label (src/assert.sh:15) captures find_test_function_name via $(...) and is itself always captured via $(...) at every call site; bashunit::handle_bool_assertion_failure (src/assert.sh:120) and bashunit::fail (src/assert.sh:26) repeat the same nested-capture pattern.
  3. bashunit::run_command_or_eval forks a pipeline per non-literal assert_true/assert_false.src/assert.sh:111 runs $(command -v "$cmd" | "$GREP" -cE '^alias') just to detect an alias.
Task — checklist, one commit each
  •  Add a return-slot variant of strip_ansi (e.g. bashunit::str::strip_ansi_to_slot writing _BASHUNIT_STR_STRIPPED_OUT, per .claude/rules/bash-style.md), whose no-ANSI fast path sets the global with zero forks. Convert assert_equals and assert_not_equals to it. Keep the echoing strip_ansi as a thin wrapper for any other callers.
  •  Convert bashunit::assert::label, bashunit::handle_bool_assertion_failure, and bashunit::fail to return slots: add slot variants of bashunit::helper::find_test_function_name (src/helpers.sh:14) and bashunit::helper::normalize_test_function_name (src/helpers.sh:40), then update all label="$(bashunit::assert::label ...)" call sites in src/assert.sh.
  •  Replace the alias probe at src/assert.sh:111 with a fork-free builtin check, e.g. if alias -- "$cmd" >/dev/null 2>&1; then eval .... Verify equivalence: for functions/binaries/nonexistent commands alias exits non-zero, matching the current command -v | grep -c '^alias' result. Cover with a unit test that defines an alias (requires shopt -s expand_aliases in the test) and one that uses a function.
Tests first (TDD)
Behavior must not change; the existing suite is the spec. Add a regression test for each new return-slot helper: call it with one of its own internal variable names (dynamic-scoping trap documented in .claude/rules/bash-style.md, bug precedent PR #672).
Constraints
  • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no printf -v (3.1+).
  • Console output must remain byte-identical (snapshot/acceptance tests will catch drift).
Acceptance criteria
  • ./bashunit tests/ and ./bashunit --parallel tests/ pass after every commit.
  • make sa, make lint pass; shfmt -w . produces no diff.
  •  Report before/after timing of a 100-test x 10 assert_equals file in the PR (baseline above).
Line references valid at commit 1ae3e82.
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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) · Issue #772 · TypedDevs/bashunit · GitHub
Skip to content
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) #772
Closed
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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe)#772
Assignees
Chemaclass
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enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Jul 12, 2026
Part of #761.
Problem
The assertion layer still forks avoidable subshells on its hottest paths (measured on macOS bash 3.2, Apple Silicon, commit 1ae3e82):
  1. assert_equals/assert_not_equals fork twice per call, even on success.src/assert.sh:159,161 and src/assert.sh:182,184 capture bashunit::str::strip_ansi with $(...). strip_ansi (src/str.sh:4) already has a pure-bash fast path for plain input, but callers still pay the command-substitution fork to read it. Measured: a file with 1000 assert_equals runs in ~1.45s vs ~0.68s for the trivial baseline, i.e. ~0.77ms extra per assertion.
  2. Failure-path label resolution forks 2-3 more times per failing assertion.bashunit::assert::label (src/assert.sh:15) captures find_test_function_name via $(...) and is itself always captured via $(...) at every call site; bashunit::handle_bool_assertion_failure (src/assert.sh:120) and bashunit::fail (src/assert.sh:26) repeat the same nested-capture pattern.
  3. bashunit::run_command_or_eval forks a pipeline per non-literal assert_true/assert_false.src/assert.sh:111 runs $(command -v "$cmd" | "$GREP" -cE '^alias') just to detect an alias.
Task — checklist, one commit each
  •  Add a return-slot variant of strip_ansi (e.g. bashunit::str::strip_ansi_to_slot writing _BASHUNIT_STR_STRIPPED_OUT, per .claude/rules/bash-style.md), whose no-ANSI fast path sets the global with zero forks. Convert assert_equals and assert_not_equals to it. Keep the echoing strip_ansi as a thin wrapper for any other callers.
  •  Convert bashunit::assert::label, bashunit::handle_bool_assertion_failure, and bashunit::fail to return slots: add slot variants of bashunit::helper::find_test_function_name (src/helpers.sh:14) and bashunit::helper::normalize_test_function_name (src/helpers.sh:40), then update all label="$(bashunit::assert::label ...)" call sites in src/assert.sh.
  •  Replace the alias probe at src/assert.sh:111 with a fork-free builtin check, e.g. if alias -- "$cmd" >/dev/null 2>&1; then eval .... Verify equivalence: for functions/binaries/nonexistent commands alias exits non-zero, matching the current command -v | grep -c '^alias' result. Cover with a unit test that defines an alias (requires shopt -s expand_aliases in the test) and one that uses a function.
Tests first (TDD)
Behavior must not change; the existing suite is the spec. Add a regression test for each new return-slot helper: call it with one of its own internal variable names (dynamic-scoping trap documented in .claude/rules/bash-style.md, bug precedent PR #672).
Constraints
  • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no printf -v (3.1+).
  • Console output must remain byte-identical (snapshot/acceptance tests will catch drift).
Acceptance criteria
  • ./bashunit tests/ and ./bashunit --parallel tests/ pass after every commit.
  • make sa, make lint pass; shfmt -w . produces no diff.
  •  Report before/after timing of a 100-test x 10 assert_equals file in the PR (baseline above).
Line references valid at commit 1ae3e82.
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var __m = "*";
var __re = new RegExp('^' + ".*" + '
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) · Issue #772 · TypedDevs/bashunit · GitHub
Skip to content
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) #772
Closed
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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe)#772
Assignees
Chemaclass
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enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Jul 12, 2026
Part of #761.
Problem
The assertion layer still forks avoidable subshells on its hottest paths (measured on macOS bash 3.2, Apple Silicon, commit 1ae3e82):
  1. assert_equals/assert_not_equals fork twice per call, even on success.src/assert.sh:159,161 and src/assert.sh:182,184 capture bashunit::str::strip_ansi with $(...). strip_ansi (src/str.sh:4) already has a pure-bash fast path for plain input, but callers still pay the command-substitution fork to read it. Measured: a file with 1000 assert_equals runs in ~1.45s vs ~0.68s for the trivial baseline, i.e. ~0.77ms extra per assertion.
  2. Failure-path label resolution forks 2-3 more times per failing assertion.bashunit::assert::label (src/assert.sh:15) captures find_test_function_name via $(...) and is itself always captured via $(...) at every call site; bashunit::handle_bool_assertion_failure (src/assert.sh:120) and bashunit::fail (src/assert.sh:26) repeat the same nested-capture pattern.
  3. bashunit::run_command_or_eval forks a pipeline per non-literal assert_true/assert_false.src/assert.sh:111 runs $(command -v "$cmd" | "$GREP" -cE '^alias') just to detect an alias.
Task — checklist, one commit each
  •  Add a return-slot variant of strip_ansi (e.g. bashunit::str::strip_ansi_to_slot writing _BASHUNIT_STR_STRIPPED_OUT, per .claude/rules/bash-style.md), whose no-ANSI fast path sets the global with zero forks. Convert assert_equals and assert_not_equals to it. Keep the echoing strip_ansi as a thin wrapper for any other callers.
  •  Convert bashunit::assert::label, bashunit::handle_bool_assertion_failure, and bashunit::fail to return slots: add slot variants of bashunit::helper::find_test_function_name (src/helpers.sh:14) and bashunit::helper::normalize_test_function_name (src/helpers.sh:40), then update all label="$(bashunit::assert::label ...)" call sites in src/assert.sh.
  •  Replace the alias probe at src/assert.sh:111 with a fork-free builtin check, e.g. if alias -- "$cmd" >/dev/null 2>&1; then eval .... Verify equivalence: for functions/binaries/nonexistent commands alias exits non-zero, matching the current command -v | grep -c '^alias' result. Cover with a unit test that defines an alias (requires shopt -s expand_aliases in the test) and one that uses a function.
Tests first (TDD)
Behavior must not change; the existing suite is the spec. Add a regression test for each new return-slot helper: call it with one of its own internal variable names (dynamic-scoping trap documented in .claude/rules/bash-style.md, bug precedent PR #672).
Constraints
  • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no printf -v (3.1+).
  • Console output must remain byte-identical (snapshot/acceptance tests will catch drift).
Acceptance criteria
  • ./bashunit tests/ and ./bashunit --parallel tests/ pass after every commit.
  • make sa, make lint pass; shfmt -w . produces no diff.
  •  Report before/after timing of a 100-test x 10 assert_equals file in the PR (baseline above).
Line references valid at commit 1ae3e82.
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var __re = new RegExp('^' + "youtube\\.com" + '
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) · Issue #772 · TypedDevs/bashunit · GitHub
Skip to content
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) #772
Closed
Closed
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe)#772
Assignees
Chemaclass
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enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Jul 12, 2026
Part of #761.
Problem
The assertion layer still forks avoidable subshells on its hottest paths (measured on macOS bash 3.2, Apple Silicon, commit 1ae3e82):
  1. assert_equals/assert_not_equals fork twice per call, even on success.src/assert.sh:159,161 and src/assert.sh:182,184 capture bashunit::str::strip_ansi with $(...). strip_ansi (src/str.sh:4) already has a pure-bash fast path for plain input, but callers still pay the command-substitution fork to read it. Measured: a file with 1000 assert_equals runs in ~1.45s vs ~0.68s for the trivial baseline, i.e. ~0.77ms extra per assertion.
  2. Failure-path label resolution forks 2-3 more times per failing assertion.bashunit::assert::label (src/assert.sh:15) captures find_test_function_name via $(...) and is itself always captured via $(...) at every call site; bashunit::handle_bool_assertion_failure (src/assert.sh:120) and bashunit::fail (src/assert.sh:26) repeat the same nested-capture pattern.
  3. bashunit::run_command_or_eval forks a pipeline per non-literal assert_true/assert_false.src/assert.sh:111 runs $(command -v "$cmd" | "$GREP" -cE '^alias') just to detect an alias.
Task — checklist, one commit each
  •  Add a return-slot variant of strip_ansi (e.g. bashunit::str::strip_ansi_to_slot writing _BASHUNIT_STR_STRIPPED_OUT, per .claude/rules/bash-style.md), whose no-ANSI fast path sets the global with zero forks. Convert assert_equals and assert_not_equals to it. Keep the echoing strip_ansi as a thin wrapper for any other callers.
  •  Convert bashunit::assert::label, bashunit::handle_bool_assertion_failure, and bashunit::fail to return slots: add slot variants of bashunit::helper::find_test_function_name (src/helpers.sh:14) and bashunit::helper::normalize_test_function_name (src/helpers.sh:40), then update all label="$(bashunit::assert::label ...)" call sites in src/assert.sh.
  •  Replace the alias probe at src/assert.sh:111 with a fork-free builtin check, e.g. if alias -- "$cmd" >/dev/null 2>&1; then eval .... Verify equivalence: for functions/binaries/nonexistent commands alias exits non-zero, matching the current command -v | grep -c '^alias' result. Cover with a unit test that defines an alias (requires shopt -s expand_aliases in the test) and one that uses a function.
Tests first (TDD)
Behavior must not change; the existing suite is the spec. Add a regression test for each new return-slot helper: call it with one of its own internal variable names (dynamic-scoping trap documented in .claude/rules/bash-style.md, bug precedent PR #672).
Constraints
  • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no printf -v (3.1+).
  • Console output must remain byte-identical (snapshot/acceptance tests will catch drift).
Acceptance criteria
  • ./bashunit tests/ and ./bashunit --parallel tests/ pass after every commit.
  • make sa, make lint pass; shfmt -w . produces no diff.
  •  Report before/after timing of a 100-test x 10 assert_equals file in the PR (baseline above).
Line references valid at commit 1ae3e82.
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var __re = new RegExp('^' + ".*" + '
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) · Issue #772 · TypedDevs/bashunit · GitHub
Skip to content
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) #772
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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe)#772
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enhancementNew feature or request
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@Chemaclass
Chemaclass
opened on Jul 12, 2026
Part of #761.
Problem
The assertion layer still forks avoidable subshells on its hottest paths (measured on macOS bash 3.2, Apple Silicon, commit 1ae3e82):
  1. assert_equals/assert_not_equals fork twice per call, even on success.src/assert.sh:159,161 and src/assert.sh:182,184 capture bashunit::str::strip_ansi with $(...). strip_ansi (src/str.sh:4) already has a pure-bash fast path for plain input, but callers still pay the command-substitution fork to read it. Measured: a file with 1000 assert_equals runs in ~1.45s vs ~0.68s for the trivial baseline, i.e. ~0.77ms extra per assertion.
  2. Failure-path label resolution forks 2-3 more times per failing assertion.bashunit::assert::label (src/assert.sh:15) captures find_test_function_name via $(...) and is itself always captured via $(...) at every call site; bashunit::handle_bool_assertion_failure (src/assert.sh:120) and bashunit::fail (src/assert.sh:26) repeat the same nested-capture pattern.
  3. bashunit::run_command_or_eval forks a pipeline per non-literal assert_true/assert_false.src/assert.sh:111 runs $(command -v "$cmd" | "$GREP" -cE '^alias') just to detect an alias.
Task — checklist, one commit each
  •  Add a return-slot variant of strip_ansi (e.g. bashunit::str::strip_ansi_to_slot writing _BASHUNIT_STR_STRIPPED_OUT, per .claude/rules/bash-style.md), whose no-ANSI fast path sets the global with zero forks. Convert assert_equals and assert_not_equals to it. Keep the echoing strip_ansi as a thin wrapper for any other callers.
  •  Convert bashunit::assert::label, bashunit::handle_bool_assertion_failure, and bashunit::fail to return slots: add slot variants of bashunit::helper::find_test_function_name (src/helpers.sh:14) and bashunit::helper::normalize_test_function_name (src/helpers.sh:40), then update all label="$(bashunit::assert::label ...)" call sites in src/assert.sh.
  •  Replace the alias probe at src/assert.sh:111 with a fork-free builtin check, e.g. if alias -- "$cmd" >/dev/null 2>&1; then eval .... Verify equivalence: for functions/binaries/nonexistent commands alias exits non-zero, matching the current command -v | grep -c '^alias' result. Cover with a unit test that defines an alias (requires shopt -s expand_aliases in the test) and one that uses a function.
Tests first (TDD)
Behavior must not change; the existing suite is the spec. Add a regression test for each new return-slot helper: call it with one of its own internal variable names (dynamic-scoping trap documented in .claude/rules/bash-style.md, bug precedent PR #672).
Constraints
  • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no printf -v (3.1+).
  • Console output must remain byte-identical (snapshot/acceptance tests will catch drift).
Acceptance criteria
  • ./bashunit tests/ and ./bashunit --parallel tests/ pass after every commit.
  • make sa, make lint pass; shfmt -w . produces no diff.
  •  Report before/after timing of a 100-test x 10 assert_equals file in the PR (baseline above).
Line references valid at commit 1ae3e82.
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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) · Issue #772 · TypedDevs/bashunit · GitHub
Skip to content
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) #772
Closed
Closed
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe)#772
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Chemaclass
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enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Jul 12, 2026
Part of #761.
Problem
The assertion layer still forks avoidable subshells on its hottest paths (measured on macOS bash 3.2, Apple Silicon, commit 1ae3e82):
  1. assert_equals/assert_not_equals fork twice per call, even on success.src/assert.sh:159,161 and src/assert.sh:182,184 capture bashunit::str::strip_ansi with $(...). strip_ansi (src/str.sh:4) already has a pure-bash fast path for plain input, but callers still pay the command-substitution fork to read it. Measured: a file with 1000 assert_equals runs in ~1.45s vs ~0.68s for the trivial baseline, i.e. ~0.77ms extra per assertion.
  2. Failure-path label resolution forks 2-3 more times per failing assertion.bashunit::assert::label (src/assert.sh:15) captures find_test_function_name via $(...) and is itself always captured via $(...) at every call site; bashunit::handle_bool_assertion_failure (src/assert.sh:120) and bashunit::fail (src/assert.sh:26) repeat the same nested-capture pattern.
  3. bashunit::run_command_or_eval forks a pipeline per non-literal assert_true/assert_false.src/assert.sh:111 runs $(command -v "$cmd" | "$GREP" -cE '^alias') just to detect an alias.
Task — checklist, one commit each
  •  Add a return-slot variant of strip_ansi (e.g. bashunit::str::strip_ansi_to_slot writing _BASHUNIT_STR_STRIPPED_OUT, per .claude/rules/bash-style.md), whose no-ANSI fast path sets the global with zero forks. Convert assert_equals and assert_not_equals to it. Keep the echoing strip_ansi as a thin wrapper for any other callers.
  •  Convert bashunit::assert::label, bashunit::handle_bool_assertion_failure, and bashunit::fail to return slots: add slot variants of bashunit::helper::find_test_function_name (src/helpers.sh:14) and bashunit::helper::normalize_test_function_name (src/helpers.sh:40), then update all label="$(bashunit::assert::label ...)" call sites in src/assert.sh.
  •  Replace the alias probe at src/assert.sh:111 with a fork-free builtin check, e.g. if alias -- "$cmd" >/dev/null 2>&1; then eval .... Verify equivalence: for functions/binaries/nonexistent commands alias exits non-zero, matching the current command -v | grep -c '^alias' result. Cover with a unit test that defines an alias (requires shopt -s expand_aliases in the test) and one that uses a function.
Tests first (TDD)
Behavior must not change; the existing suite is the spec. Add a regression test for each new return-slot helper: call it with one of its own internal variable names (dynamic-scoping trap documented in .claude/rules/bash-style.md, bug precedent PR #672).
Constraints
  • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no printf -v (3.1+).
  • Console output must remain byte-identical (snapshot/acceptance tests will catch drift).
Acceptance criteria
  • ./bashunit tests/ and ./bashunit --parallel tests/ pass after every commit.
  • make sa, make lint pass; shfmt -w . produces no diff.
  •  Report before/after timing of a 100-test x 10 assert_equals file in the PR (baseline above).
Line references valid at commit 1ae3e82.
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    Done
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perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) · Issue #772 · TypedDevs/bashunit · GitHub
Skip to content
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe) #772
Closed
Closed
perf(assert): remove per-assertion subshell forks (strip_ansi, label, alias probe)#772
Assignees
Chemaclass
Labels
enhancementNew feature or request
Description
@Chemaclass
Chemaclass
opened on Jul 12, 2026
Part of #761.
Problem
The assertion layer still forks avoidable subshells on its hottest paths (measured on macOS bash 3.2, Apple Silicon, commit 1ae3e82):
  1. assert_equals/assert_not_equals fork twice per call, even on success.src/assert.sh:159,161 and src/assert.sh:182,184 capture bashunit::str::strip_ansi with $(...). strip_ansi (src/str.sh:4) already has a pure-bash fast path for plain input, but callers still pay the command-substitution fork to read it. Measured: a file with 1000 assert_equals runs in ~1.45s vs ~0.68s for the trivial baseline, i.e. ~0.77ms extra per assertion.
  2. Failure-path label resolution forks 2-3 more times per failing assertion.bashunit::assert::label (src/assert.sh:15) captures find_test_function_name via $(...) and is itself always captured via $(...) at every call site; bashunit::handle_bool_assertion_failure (src/assert.sh:120) and bashunit::fail (src/assert.sh:26) repeat the same nested-capture pattern.
  3. bashunit::run_command_or_eval forks a pipeline per non-literal assert_true/assert_false.src/assert.sh:111 runs $(command -v "$cmd" | "$GREP" -cE '^alias') just to detect an alias.
Task — checklist, one commit each
  •  Add a return-slot variant of strip_ansi (e.g. bashunit::str::strip_ansi_to_slot writing _BASHUNIT_STR_STRIPPED_OUT, per .claude/rules/bash-style.md), whose no-ANSI fast path sets the global with zero forks. Convert assert_equals and assert_not_equals to it. Keep the echoing strip_ansi as a thin wrapper for any other callers.
  •  Convert bashunit::assert::label, bashunit::handle_bool_assertion_failure, and bashunit::fail to return slots: add slot variants of bashunit::helper::find_test_function_name (src/helpers.sh:14) and bashunit::helper::normalize_test_function_name (src/helpers.sh:40), then update all label="$(bashunit::assert::label ...)" call sites in src/assert.sh.
  •  Replace the alias probe at src/assert.sh:111 with a fork-free builtin check, e.g. if alias -- "$cmd" >/dev/null 2>&1; then eval .... Verify equivalence: for functions/binaries/nonexistent commands alias exits non-zero, matching the current command -v | grep -c '^alias' result. Cover with a unit test that defines an alias (requires shopt -s expand_aliases in the test) and one that uses a function.
Tests first (TDD)
Behavior must not change; the existing suite is the spec. Add a regression test for each new return-slot helper: call it with one of its own internal variable names (dynamic-scoping trap documented in .claude/rules/bash-style.md, bug precedent PR #672).
Constraints
  • Bash 3.0+ only: no declare -A, no [[ ]], no ${var,,}, no printf -v (3.1+).
  • Console output must remain byte-identical (snapshot/acceptance tests will catch drift).
Acceptance criteria
  • ./bashunit tests/ and ./bashunit --parallel tests/ pass after every commit.
  • make sa, make lint pass; shfmt -w . produces no diff.
  •  Report before/after timing of a 100-test x 10 assert_equals file in the PR (baseline above).
Line references valid at commit 1ae3e82.
Metadata
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enhancementNew feature or request
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  • bashunit
    Status
    Done
Milestone
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