Update test

Author: mdaines

packages/viz/test/graph-objects.test.js

@@ -252,6 +252,36 @@ describe("Viz", function() {
       const result = viz.render({
         subgraphs: [
           {
+            nodes: [
+              { name: "a" }
+            ]
+          }
+        ]
+      });
+
+      assert.deepStrictEqual(result, {
+        status: "success",
+        output: `digraph {
+	graph [bb="0,0,54,36"];
+	node [label="\\N"];
+	{
+		a	[height=0.5,
+			pos="27,18",
+			width=0.75];
+	}
+}
+`,
+        errors: []
+      });
+    });
+
+    it("applies subgraph attributes correctly", function() {
+      const result = viz.render({
+        subgraphs: [
+          {
+            graphAttributes: {
+              color: "green"
+            },
             nodeAttributes: {
               color: "red"
             },
@@ -266,8 +296,9 @@ describe("Viz", function() {
         status: "success",
         output: `digraph {
 	graph [bb="0,0,54,36"];
-	node [label="\N"];
+	node [label="\\N"];
 	{
+		graph [color=green];
 		node [color=red];
 		a	[height=0.5,
 			pos="27,18",