video config construction refactoring

internal/flowdef/flowdef_test.go

@@ -0,0 +1,67 @@
+package flowdef
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+)
+
+const testVideoID = "5fbec3b1-1b0f-417d-9059-8b94a47197ed"
+
+func TestNewV210Video(t *testing.T) {
+	definition, err := NewV210Video(testVideoID, 1920, 1080, Rational{Numerator: 30000, Denominator: 1001})
+	if err != nil {
+		t.Fatalf("NewV210Video: %v", err)
+	}
+	if definition.ID != testVideoID {
+		t.Fatalf("ID = %q, want %q", definition.ID, testVideoID)
+	}
+	if definition.Format != FormatVideo || definition.MediaType != MediaTypeV210 {
+		t.Fatalf("format/media type = %q/%q", definition.Format, definition.MediaType)
+	}
+	if len(definition.Components) != 3 {
+		t.Fatalf("component count = %d, want 3", len(definition.Components))
+	}
+	if definition.Parents == nil {
+		t.Fatal("Parents is nil; want an empty JSON array")
+	}
+}
+
+func TestNewV210VideoRejectsInvalidWidth(t *testing.T) {
+	_, err := NewV210Video(testVideoID, 1919, 1080, Rational{Numerator: 25, Denominator: 1})
+	if err == nil || !strings.Contains(err.Error(), "divisible by 6") {
+		t.Fatalf("error = %v, want width divisibility error", err)
+	}
+}
+
+func TestParseV210Video(t *testing.T) {
+	want, err := NewV210Video(testVideoID, 1920, 1080, Rational{Numerator: 25, Denominator: 1})
+	if err != nil {
+		t.Fatalf("NewV210Video: %v", err)
+	}
+	data, err := json.Marshal(want)
+	if err != nil {
+		t.Fatalf("json.Marshal: %v", err)
+	}
+
+	got, err := ParseV210Video(data)
+	if err != nil {
+		t.Fatalf("ParseV210Video: %v", err)
+	}
+	if got.ID != want.ID || got.FrameWidth != want.FrameWidth || got.GrainRate != want.GrainRate {
+		t.Fatalf("parsed definition = %+v, want %+v", got, want)
+	}
+}
+
+func TestParseV210VideoRejectsAudio(t *testing.T) {
+	data := []byte(`{
+		"id":"5fbec3b1-1b0f-417d-9059-8b94a47197ed",
+		"format":"urn:x-nmos:format:audio",
+		"media_type":"audio/float32"
+	}`)
+
+	_, err := ParseV210Video(data)
+	if err == nil || !strings.Contains(err.Error(), "format must be") {
+		t.Fatalf("error = %v, want video format error", err)
+	}
+}