test: a bounded queue answered as 'busy', and bad input answered with a 4xx (red; adversarial review F6, F7)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/uploads/intake_busy_test.go

@@ -0,0 +1,31 @@
+package uploads_test
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"git.d-ma.be/mathias/tapir/internal/domain"
+	"git.d-ma.be/mathias/tapir/internal/uploads"
+)
+
+// A full queue is the user's to retry, not a server fault: a typed rejection, the row
+// failed honestly, the audio removed (adversarial review F6).
+
+func TestAccept_AFullQueueIsABusyRejectionNotAServerErrorAndLeavesNothingBehind(t *testing.T) {
+	r := newRig(t)
+	r.sub.err = uploads.ErrQueueFull
+
+	_, err := r.in.Accept(context.Background(), "user-1", "t", strings.NewReader("data"))
+
+	var rej *uploads.RejectError
+	require.True(t, errors.As(err, &rej), "a full queue must be a rejection the web layer can answer with 429: %v", err)
+	assert.Equal(t, uploads.ReasonBusy, rej.Reason)
+	assert.Contains(t, rej.Message, "waiting")
+	assert.Equal(t, domain.UploadErrBusy, r.st.failed["up-1"], "the row must not sit queued: that is the stuck spinner")
+	assert.Empty(t, r.tmpFiles(t), "the audio is deleted")
+}