Apply suggestions from code review

Author: rvagg

test/test-traversal.js

@@ -81,6 +81,7 @@ describe('traversal', () => {
         same(value, callArray[index])
       })
     })
+
     test('block with links', async () => {
       // Test Case 2
       // Input
@@ -98,6 +99,7 @@ describe('traversal', () => {
         same(value, callArray[index])
       })
     })
+
     test('block with matching links', async () => {
       // Test Case 3
       // Input
@@ -115,6 +117,7 @@ describe('traversal', () => {
         same(value, callArray[index])
       })
     })
+   
     test('depth first with duplicated block', async () => {
       // Test Case 4
       // Input
@@ -140,6 +143,7 @@ describe('traversal', () => {
         same(value, callArray[index])
       })
     })
+
     test('null return', async () => {
       const links = []
       const value = createNode(Uint8Array.from('test'), links)