This test suite is designed to ensure consistency across all Spine runtime implementations by comparing their outputs against the reference implementation (spine-libgdx).

Purpose

Unlike traditional unit tests, this test suite:

Loads skeleton data and animations in each runtime
Outputs all internal state in a consistent, diffable text format
Compares outputs between runtimes to detect discrepancies
Helps maintain consistency when porting changes from the reference implementation

DebugPrinter Locations

Each runtime has a DebugPrinter program that outputs skeleton data in a standardized format:

Java (Reference): spine-libgdx/spine-libgdx-tests/src/com/esotericsoftware/spine/DebugPrinter.java
C++: spine-cpp/tests/DebugPrinter.cpp
C: spine-c/tests/debug-printer.c
TypeScript: spine-ts/spine-core/tests/DebugPrinter.ts

Running Individual DebugPrinters

Java (spine-libgdx)

cd spine-libgdx
./gradlew :spine-libgdx-tests:runDebugPrinter -Pargs="<skeleton-path> <atlas-path> [animation-name]"

C++ (spine-cpp)

cd spine-cpp
./build.sh  # Build if needed
./build/debug-printer <skeleton-path> <atlas-path> [animation-name]

C (spine-c)

cd spine-c
./build.sh  # Build if needed
./build/debug-printer <skeleton-path> <atlas-path> [animation-name]

TypeScript (spine-ts)

cd spine-ts/spine-core
npx tsx tests/DebugPrinter.ts <skeleton-path> <atlas-path> [animation-name]

Running the Comparison Test

The main test runner compares all runtime outputs automatically:

./tests/compare-with-reference-impl.ts <skeleton-path> <atlas-path> [animation-name]

This script will:

Check if each runtime's DebugPrinter needs rebuilding
Build any out-of-date DebugPrinters
Run each DebugPrinter with the same inputs
Compare outputs and report any differences
Save individual outputs to tests/output/ for manual inspection

Example Usage

# Test with spineboy walk animation
./tests/compare-with-reference-impl.ts \
    examples/spineboy/export/spineboy-pro.json \
    examples/spineboy/export/spineboy-pma.atlas \
    walk

# Test without animation (setup pose only)
./tests/compare-with-reference-impl.ts \
    examples/spineboy/export/spineboy-pro.json \
    examples/spineboy/export/spineboy-pma.atlas

Output Format

Each DebugPrinter outputs:

SKELETON DATA: Static setup pose data (bones, slots, skins, animations metadata)
SKELETON STATE: Runtime state after applying animations

The output uses consistent formatting:

Hierarchical structure with 2-space indentation
Float values formatted to 6 decimal places
Strings quoted, nulls explicitly shown
Locale-independent number formatting (always uses . for decimals)