Write the test cases for "*naiveTraverser.Traverse" and "*naiveTraverser.Get".
Ignore "*.coverprofile".
"*naiveTraverser" should traverse all nodes of a "*naiveTrie" in the depth first order.
Write the error message for tests of "*naiveTraverser.Traverse" and "*naiveTraverser.Get".
Fix: Switch "testKey" with "resultKey".
Fix: "(*naiveTraverser).Traverse" continues until "t.stackSize() is larger than 0 or the new node is found.
Fix: Pop the last character from "t.key" in "(*naiveTraverser).stackPop".
Fix: Ignore the character which the initial node has.
Fix: "(*naiveTraverser).Traverse" traverses only descendant nodes of the initial node.
Write a test case for "*naiveTraverser.ChildrenSize".
Cosmetic change
Fix: "(*naiveTraverser).find" stops the loop when it fails to find "char" in the children.
Merge branch 'feature/test-naivetraverser'