Test improvement: removed Exception Handling (test smell)

[eas5]

This is a test refactoring.

Problem:
The Exception Handling test smell occurs when a test method explicitly a passing or failing of a test method is dependent on the production method throwing an exception.

Solution:
Use JUnit's exception handling to automatically pass/fail the test instead of writing custom exception handling code or throwing an exception. In this case, JUnit 4.13 assertThrows() was used to properly handle the expected exception.

Result:
Before:

try {
    mainHelper.checkDependantClasses(dependantClasses, "MANIFEST-NO-CLASS-PATH.MF");
    fail("Should have thrown exception");
} catch(IllegalStateException e) {
    String message = e.getMessage();
    assertThat(message, equalTo("Could not find the 'Class-Path' attribute in the manifest 'MANIFEST-NO-CLASS-PATH.MF'"));
}

After:

IllegalStateException thrown = assertThrows(IllegalStateException.class, () ->
            mainHelper.checkDependantClasses(dependantClasses, "MANIFEST-NO-CLASS-PATH.MF"));
assertTrue(thrown.getMessage().contains("Could not find the 'Class-Path' attribute in the manifest " +
            "'MANIFEST-NO-CLASS-PATH.MF'"));

[codecov-commenter]

Codecov Report

Merging #292 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #292   +/-   ##
=========================================
  Coverage     96.16%   96.16%           
  Complexity      920      920           
=========================================
  Files            56       56           
  Lines          2320     2320           
  Branches        369      369           
=========================================
  Hits           2231     2231           
  Misses           48       48           
  Partials         41       41           

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[tntim96]

Looks good...minor issue is the comments are re-formatted. Maybe I should put in a shortened or blanket license.