expectedException() usage in two pre-8.7.7 commits has broken PHP 5 testing for 8.7.x

Problem/Motivation

Two recent backports both broke PHP 5 testing (but not runtime):

1. #2313917: Core version key in module's .info.yml doesn't respect core semantic versioning
2. #3007102: Migrating to Date-only field does not drop time value

Per @Mixologic:

The backport introduced some php5.5 and php5.6 regressions:

expectException doesnt exist in phpunit 4, so the backport tests fail.

https://www.drupal.org/pift-ci-job/1397533

I see a lot of this pattern in core currently:

    if (method_exists($this, 'expectException')) {
      $this->expectException(\BadMethodCallException::class);
      $this->expectExceptionMessage('Method Drupal\Component\Datetime\DateTimePlus::diff expects parameter 1 to be a \DateTime or \Drupal\Component\Datetime\DateTimePlus object');
    }
    else {
      $this->setExpectedException(\BadMethodCallException::class, 'Method Drupal\Component\Datetime\DateTimePlus::diff expects parameter 1 to be a \DateTime or \Drupal\Component\Datetime\DateTimePlus object');
    }

Which seems to be the correct workaround to address those.

Proposed resolution

The two issues require the same fix and neither will pass tests without the other being fixed too. So, do that here.

We have two possible solutions so far on the two related issues:

1. Add a try/catch like so:
   

   +++ b/core/modules/datetime/tests/src/Unit/Plugin/migrate/field/DateFieldTest.php
   @@ -83,8 +83,13 @@ public function testDefineValueProcessPipelineException() {
   -    $this->expectException(MigrateException::class);
   -    $plugin->defineValueProcessPipeline($migration, 'field_date', ['type' => 'totoro']);
   +    try {
   +      $plugin->defineValueProcessPipeline($migration, 'field_date', ['type' => 'totoro']);
   +      $this->fail("Expected MigrateException was not thrown");
   +    }
   +    catch (\Exception $e) {
   +      $this->assertInstanceOf(MigrateException::class, $e);
   +    }
      }
   

2. Switch back to setExpectedException() like so:
   

   +++ b/core/tests/Drupal/Tests/Core/Extension/InfoParserUnitTest.php
   @@ -127,8 +126,7 @@ public function testMissingCoreCoreVersionRequirement() {
   -    $this->expectException('\Drupal\Core\Extension\InfoParserException');
   -    $this->expectExceptionMessage("$exception_message-duplicate.info.txt");
   +    $this->setExpectedException(InfoParserException::class, "$exception_message-duplicate.info.txt");
   

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet