Issue #2675006 by danflanagan8, robpowell, quietone, alexpott: Write UnitTest...

Issue #2675006 by danflanagan8, robpowell, quietone, alexpott: Write UnitTest for MigrationConfigurationTrait and fix Exception Handling

(cherry picked from commit d06a99dd)

core/modules/migrate_drupal/tests/src/Unit/MigrationConfigurationTraitTest.php

@@ -48,7 +48,7 @@ public function testGetLegacyDrupalVersion($expected_version_string, $schema_ver
       ->method('schema')
       ->willReturn($schema);
 
-    $actual_version_string = MigrationConfigurationTrait::getLegacyDrupalVersion($connection);
+    $actual_version_string = TestMigrationConfigurationTrait::getLegacyDrupalVersion($connection);
     $this->assertSame($expected_version_string, $actual_version_string);
   }
 
@@ -142,3 +142,11 @@ public function providerTestGetLegacyDrupalVersion() {
   }
 
 }
+
+/**
+ * Test class that uses the trait we are testing.
+ */
+class TestMigrationConfigurationTrait {
+  use MigrationConfigurationTrait;
+
+}