Rename test.dart to example.dart

[bcko]

examples can show up on the pub site but only if you name the example file correctly. https://www.dartlang.org/tools/pub/package-layout#examples

example file can be name as

      'example/lib/main.dart',
      'example/main.dart',
      'example/lib/$package.dart',
      'example/$package.dart',
      'example/lib/${package}_example.dart',
      'example/${package}_example.dart',
      'example/lib/example.dart',
      'example/example.dart',

related issue : dart-lang/site-www#413

[aviary3-wk]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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[codecov-io]

Codecov Report

Merging #50 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #50   +/-   ##
=======================================
  Coverage   96.29%   96.29%           
=======================================
  Files           1        1           
  Lines          27       27           
=======================================
  Hits           26       26           
  Misses          1        1

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