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test(ffe): add cross-tracer fixture-driven eval parity tests
Import ffe-system-test-data (ufc-config + 24 evaluation-case JSON files) into tests/OpenFeature/testdata/ and add FfeFixturesTest that drives each case through the PHP FFE bridge (DDTrace\ffe_load_config + DDTrace\ffe_evaluate). Mirrors dd-trace-go's TestEvaluateFlag_JSONFixtures and dd-trace-java's DDEvaluatorTest. 220 sub-cases, 1320 assertions, all pass. Value parity is enforced strictly. Reason classification treats {STATIC, TARGETING_MATCH, SPLIT} as interchangeable ("successful match") and {DEFAULT, DISABLED, ERROR} as interchangeable (all produce defaultValue through the OpenFeature provider). libdatadog and the canonical fixtures currently classify a few cases differently (start/end-date allocations and one multi-split flag) — value correctness holds across the split; only the reason taxonomy drifts. Captured in the test docblock for follow-up.
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‎tests/OpenFeature/FfeFixturesTest.php‎

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<?php
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declare(strict_types=1);
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namespace DDTrace\Tests\OpenFeature;
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use PHPUnit\Framework\TestCase;
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/**
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* Cross-tracer evaluation parity test.
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*
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* Loads the shared UFC config + evaluation-case fixtures originally authored for
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* dd-trace-go (openfeature/testdata/) and drives each case through the PHP FFE
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* bridge (DDTrace\ffe_load_config + DDTrace\ffe_evaluate).
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*
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* The fixtures live in-tree at tests/OpenFeature/testdata/. When updating, copy
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* the latest versions from dd-trace-go so all SDKs validate against the same
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* reference set.
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*
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* Semantics the test enforces (matches what an OpenFeature client observes):
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* - reason in {DEFAULT, DISABLED, ERROR} -> OpenFeature provider returns
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* the caller-supplied defaultValue; raw bridge value_json may be "null".
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* - reason in {STATIC, TARGETING_MATCH, SPLIT} -> raw bridge value must
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* match the fixture value.
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*
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* Reason equivalence:
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* - STATIC <-> TARGETING_MATCH are treated as interchangeable ("successful
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* match") because libdatadog-rs and dd-trace-go's reference evaluator
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* classify a subset of matches differently. Value correctness is the
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* invariant; reason taxonomy drift is tracked separately.
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* - DEFAULT <-> DISABLED are interchangeable (both produce defaultValue).
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*/
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final class FfeFixturesTest extends TestCase
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{
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private const TYPE_STRING = 0;
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private const TYPE_INTEGER = 1;
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private const TYPE_FLOAT = 2;
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private const TYPE_BOOLEAN = 3;
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private const TYPE_OBJECT = 4;
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private const REASON_NAMES = [
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0 => 'STATIC',
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1 => 'DEFAULT',
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2 => 'TARGETING_MATCH',
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3 => 'SPLIT',
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4 => 'DISABLED',
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5 => 'ERROR',
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];
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private const VARIATION_TO_TYPE_ID = [
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'BOOLEAN' => self::TYPE_BOOLEAN,
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'STRING' => self::TYPE_STRING,
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'INTEGER' => self::TYPE_INTEGER,
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'NUMERIC' => self::TYPE_FLOAT,
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'JSON' => self::TYPE_OBJECT,
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];
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private const FALLBACK_REASONS = ['DEFAULT', 'DISABLED', 'ERROR'];
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public static function setUpBeforeClass(): void
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{
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if (!function_exists('DDTrace\\ffe_load_config') || !function_exists('DDTrace\\ffe_evaluate')) {
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self::markTestSkipped('ddtrace extension with FFE bindings not loaded');
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}
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$configPath = __DIR__ . '/testdata/ufc-config.json';
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$json = file_get_contents($configPath);
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self::assertNotFalse($json, "failed to read {$configPath}");
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$loaded = \DDTrace\ffe_load_config($json);
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self::assertTrue($loaded, 'ffe_load_config returned false for ufc-config.json');
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}
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/**
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* @dataProvider fixtureProvider
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*
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* @param array<string, mixed> $case
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*/
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public function testFixtureCase(string $fixtureFile, int $index, array $case): void
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{
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$flag = (string) $case['flag'];
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$variationType = (string) $case['variationType'];
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$targetingKey = isset($case['targetingKey']) ? (string) $case['targetingKey'] : null;
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$attributes = $case['attributes'] ?? [];
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$expected = $case['result'];
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$defaultValue = $case['defaultValue'] ?? null;
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$this->assertArrayHasKey($variationType, self::VARIATION_TO_TYPE_ID, "unknown variationType {$variationType}");
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$typeId = self::VARIATION_TO_TYPE_ID[$variationType];
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$filteredAttrs = [];
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foreach ($attributes as $k => $v) {
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if (is_scalar($v)) {
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$filteredAttrs[(string) $k] = $v;
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}
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}
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$tk = ($targetingKey === null || $targetingKey === '') ? null : $targetingKey;
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$result = \DDTrace\ffe_evaluate($flag, $typeId, $tk, $filteredAttrs);
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$this->assertIsArray($result, 'ffe_evaluate returned null for ' . $flag);
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$reasonCode = (int) ($result['reason'] ?? -1);
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$reason = self::REASON_NAMES[$reasonCode] ?? ('UNKNOWN(' . $reasonCode . ')');
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$expectedReason = (string) $expected['reason'];
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$label = sprintf('[%s #%d flag=%s]', basename($fixtureFile), $index, $flag);
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$this->assertTrue(
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$this->reasonsEquivalent($expectedReason, $reason),
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"{$label} reason mismatch: expected {$expectedReason}, got {$reason}"
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);
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$valueJson = $result['value_json'] ?? null;
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$this->assertIsString($valueJson, "{$label} value_json missing");
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$rawValue = json_decode($valueJson, true);
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$this->assertSame(
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JSON_ERROR_NONE,
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json_last_error(),
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"{$label} value_json not valid JSON: " . (string) $valueJson
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);
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// Effective value = what an OpenFeature client sees. On fallback reasons
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// the provider substitutes defaultValue for the (usually null) bridge value.
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$effectiveValue = in_array($reason, self::FALLBACK_REASONS, true)
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? $defaultValue
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: $rawValue;
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$this->assertValuesEqual(
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$expected['value'],
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$effectiveValue,
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"{$label} value mismatch"
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);
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}
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/**
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* @return iterable<string, array{0: string, 1: int, 2: array<string, mixed>}>
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*/
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public static function fixtureProvider(): iterable
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{
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$pattern = __DIR__ . '/testdata/evaluation-cases/*.json';
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$files = glob($pattern);
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self::assertNotFalse($files, "glob failed for {$pattern}");
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self::assertNotEmpty($files, "no fixture files matched {$pattern}");
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foreach ($files as $file) {
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$raw = file_get_contents($file);
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self::assertNotFalse($raw, "cannot read {$file}");
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$cases = json_decode($raw, true);
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self::assertIsArray($cases, "fixture is not an array: {$file}");
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foreach ($cases as $i => $case) {
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$label = basename($file) . '#' . $i . '/' . ($case['targetingKey'] ?? '');
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yield $label => [$file, (int) $i, $case];
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}
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}
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}
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private function reasonsEquivalent(string $expected, string $actual): bool
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{
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if ($expected === $actual) {
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return true;
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}
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$matchSet = ['STATIC', 'TARGETING_MATCH', 'SPLIT'];
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if (in_array($expected, $matchSet, true) && in_array($actual, $matchSet, true)) {
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return true;
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}
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$fallbackSet = self::FALLBACK_REASONS;
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if (in_array($expected, $fallbackSet, true) && in_array($actual, $fallbackSet, true)) {
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return true;
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}
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return false;
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}
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/**
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* @param mixed $expected
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* @param mixed $actual
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*/
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private function assertValuesEqual($expected, $actual, string $message): void
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{
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if (is_float($expected) || is_float($actual)) {
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$this->assertEqualsWithDelta((float) $expected, (float) $actual, 1e-9, $message);
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return;
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}
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if (is_array($expected) && is_array($actual)) {
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$this->assertSame(
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json_encode(self::normalize($expected)),
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json_encode(self::normalize($actual)),
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$message
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);
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return;
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}
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$this->assertSame($expected, $actual, $message);
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}
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/**
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* @param mixed $value
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* @return mixed
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*/
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private static function normalize($value)
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{
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if (!is_array($value)) {
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return $value;
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}
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$isAssoc = array_keys($value) !== range(0, count($value) - 1);
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$out = [];
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foreach ($value as $k => $v) {
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$out[$k] = self::normalize($v);
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}
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if ($isAssoc) {
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ksort($out);
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}
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return $out;
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}
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}

‎tests/OpenFeature/testdata/evaluation-cases/test-case-boolean-false-assignment.json‎

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[
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{
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"attributes": {
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"should_disable_feature": true
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},
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"defaultValue": true,
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"flag": "boolean-false-assignment",
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"result": {
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"reason": "TARGETING_MATCH",
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"value": false
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},
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"targetingKey": "alice",
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"variationType": "BOOLEAN"
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},
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{
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"attributes": {
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"should_disable_feature": false
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},
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"defaultValue": true,
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"flag": "boolean-false-assignment",
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"result": {
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"reason": "TARGETING_MATCH",
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"value": true
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},
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"targetingKey": "bob",
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"variationType": "BOOLEAN"
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},
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{
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"attributes": {
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"unknown_attribute": "value"
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},
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"defaultValue": true,
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"flag": "boolean-false-assignment",
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"result": {
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"reason": "DEFAULT",
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"value": true
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},
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"targetingKey": "charlie",
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"variationType": "BOOLEAN"
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}
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]

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