test(uploads): validation policy -- video, no-audio, too-long, unreadable (red)

Probe-based, not extension-based: a Teams voice-only export is typically an
.mp4 with no video stream, indistinguishable from video by name (ADR-033).
Red: package uploads does not exist.

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

internal/uploads/validate_test.go

@@ -0,0 +1,95 @@
+package uploads_test
+
+import (
+	"errors"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"git.d-ma.be/mathias/tapir/internal/uploads"
+)
+
+var testLimits = uploads.Limits{MaxBytes: 200 << 20, MaxDuration: 90 * time.Minute}
+
+func TestValidate(t *testing.T) {
+	tests := []struct {
+		name       string
+		probe      uploads.Probe
+		wantReason uploads.Reason // "" = accepted
+		wantInMsg  []string
+	}{
+		{
+			name:  "audio-only file within the duration limit is accepted",
+			probe: uploads.Probe{Duration: 45 * time.Minute, HasAudio: true},
+		},
+		{
+			name:  "a recording exactly at the limit is accepted",
+			probe: uploads.Probe{Duration: 90 * time.Minute, HasAudio: true},
+		},
+		{
+			name:       "a file with a video stream is rejected and names issue 28",
+			probe:      uploads.Probe{Duration: 4 * time.Minute, HasAudio: true, HasVideo: true},
+			wantReason: uploads.ReasonVideo,
+			wantInMsg:  []string{"video", "#28"},
+		},
+		{
+			name:       "video with no audio is still rejected as video, not as missing audio",
+			probe:      uploads.Probe{Duration: 4 * time.Minute, HasVideo: true},
+			wantReason: uploads.ReasonVideo,
+			wantInMsg:  []string{"#28"},
+		},
+		{
+			name:       "a file with no audio stream is rejected",
+			probe:      uploads.Probe{Duration: 4 * time.Minute},
+			wantReason: uploads.ReasonNoAudio,
+			wantInMsg:  []string{"no audio"},
+		},
+		{
+			name:       "a recording over the limit is rejected, stating both lengths",
+			probe:      uploads.Probe{Duration: 102 * time.Minute, HasAudio: true},
+			wantReason: uploads.ReasonTooLong,
+			wantInMsg:  []string{"1 h 42 min", "1 h 30 min"},
+		},
+		{
+			name:       "zero duration is unreadable, not accepted as an empty recording",
+			probe:      uploads.Probe{HasAudio: true},
+			wantReason: uploads.ReasonUnreadable,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := uploads.Validate(tt.probe, testLimits)
+
+			if tt.wantReason == "" {
+				require.NoError(t, err)
+				return
+			}
+			var rej *uploads.RejectError
+			require.True(t, errors.As(err, &rej), "want a *RejectError, got %v", err)
+			assert.Equal(t, tt.wantReason, rej.Reason)
+			for _, s := range tt.wantInMsg {
+				assert.Contains(t, rej.Message, s)
+			}
+		})
+	}
+}
+
+func TestFormatDuration(t *testing.T) {
+	tests := []struct {
+		d    time.Duration
+		want string
+	}{
+		{90 * time.Minute, "1 h 30 min"},
+		{102 * time.Minute, "1 h 42 min"},
+		{45 * time.Minute, "45 min"},
+		{2 * time.Hour, "2 h"},
+		{30 * time.Second, "30 s"},
+	}
+	for _, tt := range tests {
+		t.Run(tt.want, func(t *testing.T) {
+			assert.Equal(t, tt.want, uploads.FormatDuration(tt.d))
+		})
+	}
+}