assertEqualCharNodes(traverser.depthFirstPreOrder(charactersOf("bd")), "bcda");
    assertEqualCharNodes(traverser.depthFirstPreOrder(charactersOf("dc")), "dabc");
    assertEqualCharNodes(traverser.depthFirstPreOrder(charactersOf("bc")), "bcda");
  }

  @Test
  public void forGraph_depthFirstPreOrder_twoCycles() {

    // These have a combination of invalid length, unrecognized characters and wrong padding.
    assertFailsToDecode(base32(), "AB=C", "Unrecognized character: =");
    assertFailsToDecode(base32(), "A=BCDE", "Invalid input length 6");
    assertFailsToDecode(base32(), "?", "Invalid input length 1");
  }

  public void testBase32UpperCaseIsNoOp() {
    assertThat(base32().upperCase()).isSameInstanceAs(base32());
  }

// Reference: 54144616-fd49-4435-8535-19c6a601bdb3
cloudfront.net

// Amazon Cognito
// Submitted by AWS Security <******@****.***>
// Reference: cb38c251-c93d-4cda-81ec-e72c4f0fdb72
auth.af-south-1.amazoncognito.com
auth.ap-east-1.amazoncognito.com
auth.ap-northeast-1.amazoncognito.com
auth.ap-northeast-2.amazoncognito.com
auth.ap-northeast-3.amazoncognito.com

  <mime-type type="application/x-cdf">
    <_comment>CD Audio</_comment>
    <magic priority="50">
      <match value="RIFF$\x00\x00\x00CDDAfmt\x20\x18" type="string" offset="0" />
      <glob pattern="*.cda"/>
    </magic>
  </mime-type>
  <mime-type type="application/x-gtar">
    <_comment>GNU tar Compressed File Archive (GNU Tape Archive)</_comment>
    <magic priority="50">
      <!-- GNU tar archive -->

iBAAA,QACA,2BAAA,mCACA,yBAAA,EACA,yBAAA,QACA,+BAAA,KACA,yBAAA,mCACA,4BAAA,0BACA,gCAAA,KACA,6BAAA,QACA,kCAAA,QACA,2BAAA,QEtPF,WhC2nHA,oBgCznHE,SAAA,SACA,QAAA,YACA,eAAA,OhC6nHF,yBgC3nHE,gBACE,SAAA,SACA,KAAA,EAAA,EAAA,KhCmoHJ,4CACA,0CAIA,gCADA,gCADA,+BADA,+BgChoHE,mChCynHF,iCAIA,uBADA,uBADA,sBADA,sBgCpnHI,QAAA,EAKJ,aACE,QAAA,KACA,UAAA,KACA,gBAAA,WAEA,0BACE,MAAA,KAIJ,W5BhBI,cAAA,wBJ+oHJ,wCgC3nHE,6CAEE,YAAA,kChC8nHJ,4CADA,kDgCznHE,uD5BVE,wBAAA,EACA,2BAAA,EJyoHJ,6CgCtnHE,+BhCqnHF,iCI3nHI,uBAAA,EACA,0B...