--- a/src/layout/Layout.test.ts	Sun Mar 20 00:54:19 2022 -0700
+++ b/src/layout/Layout.test.ts	Sun Mar 20 01:17:35 2022 -0700
@@ -155,7 +155,6 @@
 
         <> a :View; :table [ :primaryType :T1; :joinType :T2 ] .
       `);
-      vc.graph.forEach((q) => console.log("vc", q), null, null, null, null);
       const layout = new Layout(vc);
       const lr = layout.plan(
         await n3Graph(`
@@ -178,6 +177,32 @@
         [[], [EX("big")]],
       ]);
     });
+    it("groups columns by type", async()=>{
+      const vc = new ViewConfig();
+      await vc.readFromGraph(`
+        @prefix ex: <http://example.com/> .
+        @prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+        @prefix : <http://example.com/> .
+
+        <> a :View; :table [ :primaryType :T1; :joinType :T2, :T3 ] .
+      `);
+      const layout = new Layout(vc);
+      const lr = layout.plan(
+        await n3Graph(`
+        @prefix : <http://example.com/> .
+        :g1 {
+          :a a :T1; :p1 :red; :p3 :green .
+          :b a :T2; :p2 :blue .
+        }
+      `)
+      );
+      const section0 = lr.sections[0] as AlignedTable;
+      expect(section0.columnHeaders).toEqual([
+        { rdfTypes: [EX("T1")], pred: EX("p1") },
+        { rdfTypes: [EX("T1")], pred: EX("p3") },
+        { rdfTypes: [EX("T2")], pred: EX("p2") },
+      ]);
+    })
   });
   it.skip("makes a table out of ungrouped triples with the same type", async () => {});
 });