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Bug fix needs a test case to indicate the bug is fixed. @containerAnalyzer

Here is the test case

@Test
public void buildConsumerChain() {
    ConsumerConfig consumerConfig = new ConsumerConfig<>();
    consumerConfig.setBootstrap("test");
    ArrayList<String> router = new ArrayList<>();
    router.add("notExist");
    consumerConfig.setRouter(router);
    ConsumerBootstrap consumerBootstrap = Bootstraps.from(consumerConfig);
    RouterChain routerChain = RouterChain.buildConsumerChain(consumerBootstrap);
}

Codecov Report

Merging #1049 (4179a2d) into master (03abf33) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #1049      +/-   ##
============================================
+ Coverage     68.84%   69.05%   +0.21%     
- Complexity      820      831      +11     
============================================
  Files           407      409       +2     
  Lines         17619    17723     +104     
  Branches       2728     2750      +22     
============================================
+ Hits          12130    12239     +109     
+ Misses         4085     4068      -17     
- Partials       1404     1416      +12     

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Here is the test case

@Test
public void buildConsumerChain() {
    ConsumerConfig consumerConfig = new ConsumerConfig<>();
    consumerConfig.setBootstrap("test");
    ArrayList<String> router = new ArrayList<>();
    router.add("notExist");
    consumerConfig.setRouter(router);
    ConsumerBootstrap consumerBootstrap = Bootstraps.from(consumerConfig);
    RouterChain routerChain = RouterChain.buildConsumerChain(consumerBootstrap);
}

Could you add test cases to codebase?