Wrote write goroutine functions.

Refactored subpackages back to root package.

cypher_test.go

@@ -0,0 +1,43 @@
+package heartwood
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestToCypherLabel(t *testing.T) {
+	assert.Equal(t, ":`Event`", ToCypherLabel("Event"))
+}
+
+func TestToCypherLabels(t *testing.T) {
+	assert.Equal(t, ":`Event`:`ReplaceableEvent`",
+		ToCypherLabels([]string{"Event", "ReplaceableEvent"}))
+}
+
+func TestToCypherProps(t *testing.T) {
+	cases := []struct {
+		name     string
+		keys     []string
+		prefix   string
+		expected string
+	}{
+		{
+			name:     "default prefix",
+			keys:     []string{"id", "name"},
+			prefix:   "",
+			expected: "id: $id, name: $name",
+		},
+		{
+			name:     "set prefix",
+			keys:     []string{"id", "name"},
+			prefix:   "entity.",
+			expected: "id: entity.id, name: entity.name",
+		},
+	}
+
+	for _, tc := range cases {
+		t.Run(tc.name, func(t *testing.T) {
+			assert.Equal(t, tc.expected, ToCypherProps(tc.keys, tc.prefix))
+		})
+	}
+}