Detox React Native Testing Management Skill

Manage and analyze Detox end-to-end tests for React Native applications.

Core Helper Functions

#!/bin/bash

# Parse Detox configuration
detox_config() {
    if [ -f ".detoxrc.js" ]; then
        node -e "const c = require('./.detoxrc.js'); console.log(JSON.stringify(c, null, 2))" 2>/dev/null
    elif [ -f "detox.config.js" ]; then
        node -e "const c = require('./detox.config.js'); console.log(JSON.stringify(c, null, 2))" 2>/dev/null
    else
        node -e "const pkg = require('./package.json'); console.log(JSON.stringify(pkg.detox || {}, null, 2))" 2>/dev/null
    fi
}

MANDATORY: Discovery-First Pattern

Always discover Detox configuration and device targets before querying specifics.

Phase 1: Discovery

#!/bin/bash

echo "=== Detox Configuration ==="
detox_config | jq '{
    configurations: (.configurations | keys),
    devices: (.devices | keys),
    apps: (.apps | keys),
    testRunner: .testRunner
}' 2>/dev/null

echo ""
echo "=== Detox Version ==="
npx detox --version 2>/dev/null

echo ""
echo "=== Test Files ==="
TEST_DIR=$(detox_config | jq -r '.testRunner.args.testPathPattern // "e2e"' 2>/dev/null || echo "e2e")
find "$TEST_DIR" -name "*.test.ts" -o -name "*.test.js" -o -name "*.spec.ts" -o -name "*.spec.js" 2>/dev/null | head -15

echo ""
echo "=== Available Simulators ==="
xcrun simctl list devices available 2>/dev/null | grep -E "(iPhone|iPad)" | head -10
echo ""
echo "=== Available Emulators ==="
emulator -list-avds 2>/dev/null | head -5

Phase 2: Analysis

#!/bin/bash

echo "=== Build Configurations ==="
detox_config | jq -r '.apps | to_entries[] | "\(.key)\ttype=\(.value.type)\tbuild=\(.value.build // "none" | .[0:60])"' 2>/dev/null | column -t

echo ""
echo "=== Device Configurations ==="
detox_config | jq -r '.devices | to_entries[] | "\(.key)\ttype=\(.value.type)\tdevice=\(.value.device.type // .value.device.avdName // "unknown")"' 2>/dev/null | column -t

echo ""
echo "=== Test Results ==="
ARTIFACTS_DIR="${DETOX_ARTIFACTS_DIR:-artifacts}"
if [ -d "$ARTIFACTS_DIR" ]; then
    LATEST=$(ls -td "$ARTIFACTS_DIR"/*/ 2>/dev/null | head -1)
    if [ -n "$LATEST" ]; then
        echo "Latest artifacts: $LATEST"
        find "$LATEST" -name "*.log" -o -name "*.png" -o -name "*.mp4" 2>/dev/null | wc -l | xargs echo "Artifact files:"
        find "$LATEST" -name "*.log" 2>/dev/null | while read f; do
            echo "--- $(basename $f) (tail) ---"
            tail -5 "$f"
        done | head -20
    fi
fi

Output Rules

• TOKEN EFFICIENCY: Target 50 lines per output
• Summarize build/device configs rather than full Detox config
• Reference artifact paths, never embed screenshots or videos

Anti-Hallucination Rules

• NEVER guess device types or simulator names — discover via system tools
• NEVER fabricate test results — parse actual artifacts and reports
• NEVER assume platform availability — check for Xcode/Android SDK

Safety Rules

• NEVER build or run tests without user confirmation — builds take significant time
• NEVER delete artifacts without explicit user approval
• NEVER modify Detox configuration without user consent

Output Format

Present results as a structured report:

Managing Detox Report
═════════════════════
Resources discovered: [count]

Resource       Status    Key Metric    Issues
──────────────────────────────────────────────
[name]         [ok/warn] [value]       [findings]

Summary: [total] resources | [ok] healthy | [warn] warnings | [crit] critical
Action Items: [list of prioritized findings]

Target ≤50 lines of output. Use tables for multi-resource comparisons.

Counter-Rationalizations

Shortcut	Counter	Why
"I'll skip discovery and check known resources"	Always run Phase 1 discovery first	Resource names change, new resources appear — assumed names cause errors
"The user only asked for a quick check"	Follow the full discovery → analysis flow	Quick checks miss critical issues; structured analysis catches silent failures
"Default configuration is probably fine"	Audit configuration explicitly	Defaults often leave logging, security, and optimization features disabled
"Metrics aren't needed for this"	Always check relevant metrics when available	API/CLI responses show current state; metrics reveal trends and intermittent issues
"I don't have access to that"	Try the command and report the actual error	Assumed permission failures prevent useful investigation; actual errors are informative