Refactor hangup cause handling in Bird class and add new unit tests for call flow validation.

services/nginx/app/classes/bird.php

@@ -11,7 +11,7 @@ class bird
 {
     public const TEST_OUTBOUND_NUMBER_RAW = '+45 42 33 11 28';
     public const TEST_OUTBOUND_NUMBER_E164 = '+4542331128';
-    private const ALLOWED_HANGUP_CAUSES = ['rejected', 'busy', 'completed'];
+    private const ALLOWED_HANGUP_CAUSES = ['rejected', 'busy'];
     private const ACCEPTED_CALL_STATUSES = ['accepted', 'ongoing'];
     private const TERMINAL_GATE_FAILURE_STATUSES = ['rejected', 'busy', 'failed', 'cancelled', 'no-answer', 'completed'];
 

services/nginx/app/tests/Unit/Bird/BirdGateCallFlowTest.php

@@ -18,8 +18,12 @@ class BirdGateCallClientFake extends bird
 {
     /** @var string[] */
     public array $statusQueue = [];
+    /** @var string[] */
+    public array $statusesSeen = [];
     public int $hangupCalls = 0;
     /** @var array<int,array<string,mixed>> */
+    public array $hangupPayloads = [];
+    /** @var array<int,array<string,mixed>> */
     public array $createPayloads = [];
 
     /**
@@ -51,6 +55,7 @@ class BirdGateCallClientFake extends bird
         if (!is_string($status) || trim($status) === '') {
             $status = 'ringing';
         }
+        $this->statusesSeen[] = $status;
 
         return [
             'id' => $callId,
@@ -61,6 +66,7 @@ class BirdGateCallClientFake extends bird
     public function hangupVoiceCall(string $workspaceId, string $channelId, string $callId, array $payload = []): array|object|null
     {
         $this->hangupCalls++;
+        $this->hangupPayloads[] = $payload;
         return ['status' => 'completed'];
     }
 
@@ -120,6 +126,20 @@ it('hangs up when call reaches accepted state', function (): void {
     expect($client->createPayloads[0]['payload']['to'])->toBe('+4512345678');
     expect($client->createPayloads[0]['payload']['ringTimeout'])->toBe(10);
     expect(array_key_exists('timeout', $client->createPayloads[0]['payload']))->toBeFalse();
+    expect($client->hangupPayloads[0])->toBe([]);
+});
+
+it('hangs up immediately when status transitions to accepted', function (): void {
+    $client = new BirdGateCallClientFake(
+        workspaceId: 'workspace_1',
+        channelId: 'channel_1',
+        statusQueue: ['ringing', 'accepted', 'ongoing']
+    );
+
+    $client->callGateAndHangupWhenAccepted(45, 12345678, 10);
+
+    expect($client->hangupCalls)->toBe(1);
+    expect($client->statusesSeen)->toBe(['ringing', 'accepted']);
 });
 
 it('maps legacy timeout option to documented ringTimeout payload field', function (): void {
@@ -152,3 +172,35 @@ it('clamps derived ringTimeout to Bird documented max when gate timeout is high'
     expect($client->createPayloads[0]['payload']['ringTimeout'])->toBe(120);
     expect(array_key_exists('timeout', $client->createPayloads[0]['payload']))->toBeFalse();
 });
+
+it('passes documented hangup cause when provided', function (): void {
+    $client = new BirdGateCallClientFake(
+        workspaceId: 'workspace_1',
+        channelId: 'channel_1',
+        statusQueue: ['accepted']
+    );
+
+    $client->createOutboundTestCallAndHangupWhenAccepted('workspace_1', 'channel_1', [
+        'to' => '+4512345678',
+        'hangupCause' => 'rejected',
+    ]);
+
+    expect($client->hangupCalls)->toBe(1);
+    expect($client->hangupPayloads[0]['cause'])->toBe('rejected');
+});
+
+it('drops unsupported hangup cause values from request payload', function (): void {
+    $client = new BirdGateCallClientFake(
+        workspaceId: 'workspace_1',
+        channelId: 'channel_1',
+        statusQueue: ['accepted']
+    );
+
+    $client->createOutboundTestCallAndHangupWhenAccepted('workspace_1', 'channel_1', [
+        'to' => '+4512345678',
+        'hangupCause' => 'completed',
+    ]);
+
+    expect($client->hangupCalls)->toBe(1);
+    expect($client->hangupPayloads[0])->toBe([]);
+});