メール関連の PHPUnit 修正

[seasoftjapan]

• Docker Compose 構成でも PHPUnit のメール関連のテストを実行する。
  適用前後のテスト結果抜粋:

  -Tests: 1218, Assertions: 1433, Skipped: 17, Incomplete: 4.
  +Tests: 1218, Assertions: 1447, Skipped: 9, Incomplete: 4.

• fixed SC_SendMailTest::testGetBackendParams() テスト重複 #997
  • 繰り返しを削除した。

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.63%. Comparing base (fc5a36a) to head (49e834e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #998   +/-   ##
=======================================
  Coverage   55.63%   55.63%           
=======================================
  Files          75       75           
  Lines        8917     8917           
=======================================
  Hits         4961     4961           
  Misses       3956     3956           

Flag	Coverage Δ
tests	55.63% <ø> (ø)

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[nanasess]

LGTM