Analyzer Tests (Round 2)

[AtomCrafty]

Implements a set of new test helpers and rewrites one of the existing test classes to use them. A test case using this framework looks like this:

'''
// test program code
'''
.testProgram()
.diagnosticsOnly() // optional
.expectError(IssueCodes.Error1)
.expectError(IssueCodes.Error2)
.expectWarning(IssueCodes.Warning1)
.run();

Notes:

• In place of .testProgram() you can also use .testFunction(), .testStatements(), and .testInstruction(). Those will add the necessary code context so you can focus on just writing the relevant parts of the test case.
• The .diagnosticsOnly() call is optional and disables semantic analysis, meaning that only diagnostics issues reported by XText will be checked (just syntax errors and maybe some linker issues, not sure about the latter).
• The order in which errors and warnings are specified does not matter, they are sorted internally.
• My plan is to add additional methods to specify expected types and constant values in the future.
• Unfortunately the XTend formatter for Eclipse can't be configured properly and will absolutely destroy the formatting for these test cases, so please don't press the "format code" shortcut in test files.

[AtomCrafty]

Update: Added the option to specify the line number an issue is expected on and made the console output a bit nicer to look at.

========================================
      duplicateIsaStateElement1 2
========================================
 1| InstructionSet A {
 2|   architectural_state {
 3|     int x;
 4|   }
 5| }
 6| InstructionSet B extends A {
 7|   architectural_state {
 8|     int x;
 9|   }
10| }

Issues:
  WARNING: com.minres.coredsl.DuplicateIsaStateElement [line 6] (ISA parameter x has been declared multiple times (in A, B))
  ERROR: com.minres.coredsl.DuplicateIsaStateElement [line 8] (An identifier with the name x has already been declared)
Expected:
  WARNING: com.minres.coredsl.DuplicateIsaStateElement [line 6]
  ERROR: com.minres.coredsl.DuplicateIsaStateElement [line 8]