Clean up some test filenames and extraneous code

test/test_linter_retrieval.vader

@@ -0,0 +1,43 @@
+Before:
+  let g:testlinter1 = {'name': 'testlinter1', 'executable': 'testlinter1', 'command': 'testlinter1', 'callback': 'testCB1', 'output_stream': 'stdout'}
+  let g:testlinter2 = {'name': 'testlinter2', 'executable': 'testlinter2', 'command': 'testlinter2', 'callback': 'testCB2', 'output_stream': 'stdout'}
+
+  call ale#linter#Reset()
+  let g:ale_linters = {}
+  let g:ale_linter_aliases = {}
+
+Execute (Define a linter):
+  call ale#linter#Define('testft', g:testlinter1)
+Then (Get the defined linter):
+  AssertEqual [g:testlinter1], ale#linter#Get('testft')
+
+Execute (Define a couple linters, filtering one):
+  call ale#linter#Define('testft', g:testlinter1)
+  call ale#linter#Define('testft', g:testlinter2)
+  let g:ale_linters = {'testft': ['testlinter1']}
+Then (Only the configured linter should be returned):
+  AssertEqual [g:testlinter1], ale#linter#Get('testft')
+
+Execute (Define a linter for a filetype, and create a filetype alias):
+  call ale#linter#Define('testft1', g:testlinter1)
+  let g:ale_linter_aliases = {'testft2': 'testft1'}
+Then (Linters should be transparently aliased):
+  AssertEqual [g:testlinter1], ale#linter#Get('testft2')
+
+Execute (Define multiple linters, with filters and aliases):
+  call ale#linter#Define('testft1', g:testlinter1)
+  call ale#linter#Define('testft1', g:testlinter2)
+  let g:ale_linters = {'testft1': ['testlinter1'], 'testft2': ['testlinter2']}
+  let g:ale_linter_aliases = {'testft2': 'testft1'}
+Then (Linters should be transparently filtered and aliased):
+  AssertEqual [g:testlinter1], ale#linter#Get('testft1')
+  AssertEqual [g:testlinter2], ale#linter#Get('testft2')
+
+Execute (Define multiple linters for different filetypes):
+  call ale#linter#Define('testft1', g:testlinter1)
+  call ale#linter#Define('testft2', g:testlinter2)
+Then (Linters for dot-seperated filetypes should be properly handled):
+  AssertEqual [g:testlinter1, g:testlinter2], ale#linter#Get('testft1.testft2')
+
+Execute (Try to load a linter from disk):
+  AssertEqual [{'name': 'testlinter', 'output_stream': 'stdout', 'executable': 'testlinter', 'command': 'testlinter', 'callback': 'testCB'}], ale#linter#Get('testft')