knots-test-complexity

A Rust-based test quality analyzer for C projects that validates unit tests have sufficient complexity to thoroughly exercise source code.

Motivation

Traditional code coverage metrics (line, branch, function) can be misleading. A test can achieve 100% branch coverage with simple assertions while missing critical edge cases like:

Overflow scenarios: uint16_t timer wrapping at 65535
Boundary conditions: Off-by-one errors at array bounds
State transitions: Complex state machines with temporal dependencies
Error paths: Multiple error conditions not all tested

This tool enforces that tests have sufficient cyclomatic complexity to exercise all logical paths and boundary value testing to catch edge cases.

Philosophy

"A test with lower complexity than its source code is likely not testing all scenarios."

Example: The Overflow Bug

// Source: Cyclomatic Complexity = 2
uint16_t timer_ms = 0;

void periodic_1ms() {
    timer_ms++;  // Overflows at 65535!
}

bool is_timeout(uint16_t start_ms, uint16_t duration_ms) {
    return (timer_ms - start_ms) >= duration_ms;
}

Traditional Coverage (100% line, 100% branch):

void test_timeout() {
    timer_ms = 0;
    TEST_ASSERT_TRUE(is_timeout(0, 100));   // Happy path
    TEST_ASSERT_FALSE(is_timeout(0, 1));    // Boundary
}
// PASSES coverage but MISSES overflow bug!

Tool Enforcement - Would detect:

Test complexity (2) barely meets source complexity (2)
Missing boundary tests: 0, 65535, wrap-around scenarios
Missing state variation: timer_ms at different values

Better Tests (Higher Complexity):

void test_timeout_boundaries() {
    // Boundary: timer at 0
    timer_ms = 0;
    TEST_ASSERT_TRUE(is_timeout(0, 100));

    // Boundary: timer near max
    timer_ms = 65530;
    TEST_ASSERT_TRUE(is_timeout(65520, 100));

    // CRITICAL: Overflow scenario
    timer_ms = 5;  // Wrapped from 65535
    TEST_ASSERT_TRUE(is_timeout(65530, 100));  // Catches overflow!

    // Multiple start/duration combinations
    for (int i = 0; i < 5; i++) {
        test_scenario(scenarios[i]);
    }
}
// Higher complexity test catches the bug!

Features

Core Metrics

Test-to-Source Complexity Ratio
- Aggregate cyclomatic complexity of all test functions
- Compare to aggregate complexity of source functions
- Default threshold: 70% (configurable)
Boundary Value Detection
- Detects integer types: uint8_t, uint16_t, uint32_t, int8_t, etc.
- Identifies range checks: if (x > MAX), if (x < MIN)
- Counts required boundary tests
- Validates tests cover: MIN, MIN-1, MAX, MAX+1
State Variable Tracking (Future Enhancement)
- Identifies static, volatile, and global variables
- Requires multiple test scenarios per state variable
- Validates state transitions are tested

Output Modes

Warning Mode (default): Reports violations but doesn't fail pre-commit
Error Mode: Fails pre-commit on violations
Verbose Mode: Shows detailed per-function complexity breakdown

Building

cargo build --release --workspace

The binary will be at target/release/knots-test-complexity

Installation

From Source

cd knots
cargo build --release --workspace
# Binary is at target/release/knots-test-complexity

Add to your PATH or copy to a location in your PATH.

Pre-Commit Integration

Add to your project's .pre-commit-config.yaml:

repos:
  - repo: https://github.com/brandon-arrendondo/knots
    rev: v0.3.0  # Use specific version tag
    hooks:
      - id: test-complexity
        args:
          - --threshold=0.70
          - --boundary-threshold=0.80
          - --level=warn
          - --framework=ceedling
          - --test-dir=Test

Configuration Options:

--threshold=0.70: Minimum test-to-source complexity ratio (default: 0.70 = 70%)
--level=warn: Enforcement level (warn or error, default: warn)
--no-check-boundaries: Disable boundary value detection (enabled by default)
--verbose: Show detailed per-file analysis

Example: Strict Enforcement

args:
  - --threshold=0.80
  - --level=error
  - --verbose

Example: Warning Only (No Boundaries)

args:
  - --threshold=0.70
  - --level=warn
  - --no-check-boundaries

Usage

Command Line

Analyze a test file and its corresponding source:

knots-test-complexity Test/test_battery_service.c Core/Src/modules/battery_service/battery_service.c

With verbose output:

knots-test-complexity -v Test/test_battery_service.c Core/Src/modules/battery_service/battery_service.c

With custom thresholds:

knots-test-complexity \
  --threshold=0.70 \
  --boundary-threshold=0.80 \
  --level=error \
  Test/test_timer.c Core/Src/timer.c

Output Example

Analyzing Test Quality: test_battery_service.c
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Source File: battery_service.c
  Functions: 15
  Total Cyclomatic Complexity: 87
  Boundary Values Detected: 12
    - uint8_t variables: 4 (boundaries: 0, 255)
    - Range checks: 8 (if (x > MAX), etc.)

Test File: test_battery_service.c
  Functions: 58
  Total Cyclomatic Complexity: 74
  Boundary Tests Found: 15

Complexity Analysis:
  Test/Source Ratio: 85% ✓ (threshold: 70%)
  Test Complexity: 74
  Source Complexity: 87
  Ratio: 74/87 = 0.85

Boundary Analysis:
  Required Boundary Tests: 12
  Found Boundary Tests: 15 ✓
  Coverage: 125%

Result: ✓ PASS

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Failure Example

Analyzing Test Quality: test_lin_comm_service.c
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Source File: lin_comm_service.c
  Functions: 8
  Total Cyclomatic Complexity: 54
  Boundary Values Detected: 8

Test File: test_lin_comm_service.c
  Functions: 12
  Total Cyclomatic Complexity: 28
  Boundary Tests Found: 3

Complexity Analysis:
  Test/Source Ratio: 52% ✗ (threshold: 70%)
  Test Complexity: 28
  Source Complexity: 54
  Ratio: 28/54 = 0.52

Boundary Analysis:
  Required Boundary Tests: 8
  Found Boundary Tests: 3 ✗
  Missing Boundaries:
    - rxByteCounter: 0, 3, 11, 12 (RX_HEADER_SIZE boundaries)
    - rxFrameId: 0, 0x3F (FRAME_MASK boundary)

Recommendations:
  1. Add tests for edge cases and error paths
  2. Test boundary conditions: 0, max values, overflow
  3. Add state transition tests (4 static variables detected)
  4. Consider parametrized tests or loops in test code

Result: ✗ FAIL (--level=error)

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

Algorithm Details

1. Complexity Ratio Calculation

For each test file:
  1. Parse test file with tree-sitter-c
  2. Calculate cyclomatic complexity for all test functions
     - Count: if, while, for, switch, &&, ||, ?:
     - Include test helper functions
  3. Sum total test complexity

  4. Find corresponding source file
  5. Calculate cyclomatic complexity for all source functions
  6. Sum total source complexity

  7. Calculate ratio = test_complexity / source_complexity
  8. Compare ratio >= threshold (default 70%)

  9. Report: PASS or FAIL with recommendations

2. Boundary Value Detection

For source file:
  1. Find all integer type declarations
     - uint8_t → boundaries: 0, 255
     - uint16_t → boundaries: 0, 65535
     - int8_t → boundaries: -128, 127

  2. Find all range checks
     - if (x > MAX) → test MAX, MAX+1
     - if (x < MIN) → test MIN-1, MIN
     - if (x >= threshold) → test threshold-1, threshold

  3. Count required boundary tests

For test file:
  1. Find all numeric literals in assertions
  2. Match literals to source boundaries
  3. Count covered boundaries

  4. Report: boundary_coverage = found / required
  5. Warn if coverage < 100%

3. Test Helper Function Handling

Test helpers ARE included in complexity calculation:

// Helper complexity counts!
void simulate_frame(uint8_t id) {
    setup_mocks();
    if (id == SPECIAL) {  // +1 complexity
        special_handling();
    }
    verify_results();
}

// Test also counts
void test_multiple_frames() {
    for (int i = 0; i < 10; i++) {  // +1 complexity
        simulate_frame(i);  // Helper complexity included
    }
}
// Total test complexity = 2 (loop + helper's if)

This encourages well-structured tests with reusable helpers.

Integration with knots

knots-test-complexity complements knots:

Tool	Purpose	Applied To	Metric
knots	Source code quality	Production code (`.c`, `.h`)	McCabe & Cognitive complexity per function
knots-test-complexity	Test quality	Test code (`test_*.c`)	Aggregate complexity ratio & boundary coverage

Example Combined Workflow:

- repo: local
  hooks:
    # Check source code complexity (per-function limits)
    - id: knots
      name: Code Complexity Check
      entry: hooks/pre-commit-wrapper.sh
      language: script
      files: \.(c|h)$
      exclude: ^Test/
      args: [--mccabe-threshold=15, --cognitive-threshold=15]

    # Check test quality (aggregate complexity ratio)
    - id: test-complexity
      name: Test Quality Check
      entry: hooks/test-complexity-wrapper.sh
      language: script
      files: ^Test/test_.*\.c$
      args: [--threshold=70, --level=warn]

Future: Unified Tool

A future enhancement could merge both tools:

# Unified complexity tool
complexity-check --source <file.c> --test <test_file.c>
  --source-mccabe-max=15
  --source-cognitive-max=15
  --test-ratio-min=0.70
  --check-boundaries

Dependencies

[dependencies]
tree-sitter = "0.22"
tree-sitter-c = "0.21"
anyhow = "1.0"
clap = { version = "4.5", features = ["derive"] }
regex = "1.10"

Project Structure

knots-test-complexity/
├── Cargo.toml                          # Rust project manifest
├── README.md                           # This file
├── src/
│   ├── main.rs                        # CLI entry point
│   ├── analyzer.rs                    # Test quality analyzer
│   ├── boundary.rs                    # Boundary value detector
│   └── reporter.rs                    # Output formatting
└── examples/
    ├── test_timer_good.c              # Example: sufficient complexity
    ├── test_timer_bad.c               # Example: insufficient complexity
    └── README.md                      # Example documentation

Testing

Run the test suite:

cargo test

Run with verbose output:

cargo test -- --nocapture

License

MIT License. See LICENSE file.

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1.16.0 This release

Aug 26, 2026 8 files

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Jun 27, 2026 8 files

knots-test-complexity 1.16.0

knots-test-complexity

Motivation

Philosophy

Example: The Overflow Bug

Features

Core Metrics

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1. Complexity Ratio Calculation

2. Boundary Value Detection

3. Test Helper Function Handling

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Future: Unified Tool

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