Add an AssertLinter command for tests

test/command_callback/test_tslint_command_callback.vader

@@ -1,4 +1,6 @@
 Before:
+  call ale#assert#Init()
+
   Save g:ale_typescript_tslint_executable
   Save g:ale_typescript_tslint_config_path
   Save g:ale_typescript_tslint_rules_dir
@@ -26,26 +28,25 @@ After:
   call ale#linter#Reset()
 
 Execute(The default tslint command should be correct):
-  AssertEqual
+  AssertLinter
+  \ 'tslint',
   \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
-  \   . ale#Escape('tslint') . ' --format json %t',
-  \ ale_linters#typescript#tslint#GetCommand(bufnr(''))
+  \   . ale#Escape('tslint') . ' --format json %t'
 
 Execute(The rules directory option should be included if set):
   let b:ale_typescript_tslint_rules_dir = '/foo/bar'
 
-  AssertEqual
+  AssertLinter
+  \ 'tslint',
   \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
   \   . ale#Escape('tslint') . ' --format json'
   \   . ' -r ' . ale#Escape('/foo/bar')
-  \   . ' %t',
-  \ ale_linters#typescript#tslint#GetCommand(bufnr(''))
+  \   . ' %t'
 
 Execute(The executable should be configurable and escaped):
   let b:ale_typescript_tslint_executable = 'foo bar'
 
-  AssertEqual 'foo bar', ale_linters#typescript#tslint#GetExecutable(bufnr(''))
-  AssertEqual
+  AssertLinter
+  \ 'foo bar',
   \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
-  \   . ale#Escape('foo bar') . ' --format json %t',
-  \ ale_linters#typescript#tslint#GetCommand(bufnr(''))
+  \   . ale#Escape('foo bar') . ' --format json %t'

test/command_callback/test_write_good_command_callback.vader

@@ -1,4 +1,6 @@
 Before:
+  call ale#assert#Init()
+
   Save g:ale_writegood_options
   Save g:ale_writegood_executable
   Save g:ale_writegood_use_global
@@ -7,6 +9,8 @@ Before:
   unlet! g:ale_writegood_executable
   unlet! g:ale_writegood_use_global
 
+  runtime ale_linters/markdown/write-good.vim
+
   call ale#test#SetDirectory('/testplugin/test/command_callback')
   call ale#test#SetFilename('testfile.txt')
 
@@ -16,42 +20,36 @@ After:
   Restore
 
   call ale#test#RestoreDirectory()
+  call ale#linter#Reset()
 
 Execute(The global executable should be used when the local one cannot be found):
-  AssertEqual 'write-good', ale#handlers#writegood#GetExecutable(bufnr(''))
-  AssertEqual
+  AssertLinter
+  \ 'write-good',
   \ ale#Escape('write-good') . ' %t',
-  \ ale#handlers#writegood#GetCommand(bufnr(''))
 
 Execute(The options should be used in the command):
   let g:ale_writegood_options = '--foo --bar'
 
-  AssertEqual
+  AssertLinter
+  \ 'write-good',
   \ ale#Escape('write-good') . ' --foo --bar %t',
-  \ ale#handlers#writegood#GetCommand(bufnr(''))
 
 Execute(Should use the node_modules/.bin executable, if available):
   call ale#test#SetFilename('write-good-node-modules/test.txt')
 
-  AssertEqual
+  AssertLinter
   \ ale#path#Simplify(g:dir . '/write-good-node-modules/node_modules/.bin/write-good'),
-  \ ale#handlers#writegood#GetExecutable(bufnr(''))
-  AssertEqual
   \ ale#Escape(ale#path#Simplify(g:dir . '/write-good-node-modules/node_modules/.bin/write-good'))
   \   . ' %t',
-  \ ale#handlers#writegood#GetCommand(bufnr(''))
 
 Execute(Should use the node_modules/write-good executable, if available):
   call ale#test#SetFilename('write-good-node-modules-2/test.txt')
 
-  AssertEqual
+  AssertLinter
   \ ale#path#Simplify(g:dir . '/write-good-node-modules-2/node_modules/write-good/bin/write-good.js'),
-  \ ale#handlers#writegood#GetExecutable(bufnr(''))
-  AssertEqual
   \   (has('win32') ? 'node.exe ' : '')
   \   . ale#Escape(ale#path#Simplify(g:dir . '/write-good-node-modules-2/node_modules/write-good/bin/write-good.js'))
   \   . ' %t',
-  \ ale#handlers#writegood#GetCommand(bufnr(''))
 
 Execute(Should let users configure a global executable and override local paths):
   call ale#test#SetFilename('write-good-node-modules-2/test.txt')
@@ -59,7 +57,4 @@ Execute(Should let users configure a global executable and override local paths)
   let g:ale_writegood_executable = 'foo-bar'
   let g:ale_writegood_use_global = 1
 
-  AssertEqual 'foo-bar', ale#handlers#writegood#GetExecutable(bufnr(''))
-  AssertEqual
-  \ ale#Escape('foo-bar') . ' %t',
-  \ ale#handlers#writegood#GetCommand(bufnr(''))
+  AssertLinter 'foo-bar', ale#Escape('foo-bar') . ' %t'