test: migrate ImportBuilderTest to JUnit 5

[MartinWitt]

#3919

Change Log

The following bad smells are refactored:

JUnit4-@test

The JUnit 4 @Test annotation should be replaced with JUnit 5 @Test annotation.

JUnit4Assertion

The JUnit4 assertion should be replaced with JUnit5 Assertions.

The following has changed in the code:

JUnit4-@test

• Replaced junit 4 test annotation with junit 5 test annotation in testWithNoImport
• Replaced junit 4 test annotation with junit 5 test annotation in testWithSimpleImport
• Replaced junit 4 test annotation with junit 5 test annotation in testWithSimpleImportNoAutoimport
• Replaced junit 4 test annotation with junit 5 test annotation in testInternalImportWhenNoClasspath
• Replaced junit 4 test annotation with junit 5 test annotation in testSimpleStaticImport
• Replaced junit 4 test annotation with junit 5 test annotation in testWithStaticStarredImportFromInterface
• Replaced junit 4 test annotation with junit 5 test annotation in testWithStaticInheritedImport
• Replaced junit 4 test annotation with junit 5 test annotation in testWithImportFromItf

JUnit4Assertion

• Transformed junit4 assert to junit 5 assertion in testWithNoImport
• Transformed junit4 assert to junit 5 assertion in testWithSimpleImport
• Transformed junit4 assert to junit 5 assertion in testWithSimpleImportNoAutoimport
• Transformed junit4 assert to junit 5 assertion in testInternalImportWhenNoClasspath
• Transformed junit4 assert to junit 5 assertion in testSimpleStaticImport
• Transformed junit4 assert to junit 5 assertion in testWithStaticStarredImportFromInterface
• Transformed junit4 assert to junit 5 assertion in testWithStaticInheritedImport
• Transformed junit4 assert to junit 5 assertion in testWithImportFromItf