Merge pull request #81 from goccy/feature/coverage

Add many test codes and distribute `case` operation ( of `switch` ) to some switch statements

Author: goccy

.github/workflows/go.yml

@@ -5,7 +5,7 @@ jobs:
     name: Test
     strategy:
       matrix:
-        os: [ "ubuntu-latest", "windows-latest", "macos-latest" ]
+        os: [ "ubuntu-latest", "macos-latest", "windows-latest" ]
         go-version: [ "1.13", "1.14", "1.15" ]
     runs-on: ${{ matrix.os }}
     steps: