Migrated from neostr-brainstorm.

Added unit tests.

schema_test.go

@@ -0,0 +1,45 @@
+package heartwood
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestNewRelationshipWithValidation(t *testing.T) {
+	cases := []struct {
+		name        string
+		start       *Node
+		end         *Node
+		wantErr     bool
+		wantErrText string
+	}{
+		{
+			name:  "valid start and end nodes",
+			start: NewUserNode("pubkey1"),
+			end:   NewEventNode("abc123"),
+		},
+		{
+			name:        "mismatched start node label",
+			start:       NewEventNode("abc123"),
+			end:         NewEventNode("abc123"),
+			wantErr:     true,
+			wantErrText: "expected start node to have label 'User'",
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			rel, err := NewSignedRel(tc.start, tc.end, nil)
+			if tc.wantErr {
+				assert.Error(t, err)
+				assert.ErrorContains(t, err, tc.wantErrText)
+				assert.Nil(t, rel)
+				return
+			}
+			assert.NoError(t, err)
+			assert.Equal(t, "SIGNED", rel.Type)
+			assert.Contains(t, rel.Start.Labels.ToArray(), "User")
+			assert.Contains(t, rel.End.Labels.ToArray(), "Event")
+		})
+	}
+}