Clean up embertemplatelint code

Alias ember-template-lint to embertemplatelint so users can use either
string to enable the linter.

ale_linters/handlebars/embertemplatelint.vim

@@ -52,7 +52,8 @@ function! ale_linters#handlebars#embertemplatelint#Handle(buffer, lines) abort
 endfunction
 
 call ale#linter#Define('handlebars', {
-\   'name': 'ember-template-lint',
+\   'name': 'embertemplatelint',
+\   'aliases': ['ember-template-lint'],
 \   'executable': function('ale_linters#handlebars#embertemplatelint#GetExecutable'),
 \   'command': function('ale_linters#handlebars#embertemplatelint#GetCommandWithVersionCheck'),
 \   'callback': 'ale_linters#handlebars#embertemplatelint#Handle',

doc/ale-handlebars.txt

@@ -14,7 +14,8 @@ ember-template-lint                          *ale-handlebars-embertemplatelint*
 
 g:ale_handlebars_embertemplatelint_executable
                                 *g:ale_handlebars_embertemplatelint_executable*
-  Type: |String|                  *b:ale_handlebars_embertemplatelint_executable*
+                                *b:ale_handlebars_embertemplatelint_executable*
+  Type: |String|
   Default: `'ember-template-lint'`
 
   See |ale-integrations-local-executables|
@@ -22,7 +23,8 @@ g:ale_handlebars_embertemplatelint_executable
 
 g:ale_handlebars_embertemplatelint_use_global
                                 *g:ale_handlebars_embertemplatelint_use_global*
-  Type: |Number|                  *b:ale_handlebars_embertemplatelint_use_global*
+                                *b:ale_handlebars_embertemplatelint_use_global*
+  Type: |Number|
   Default: `get(g:, 'ale_use_global_executables', 0)`
 
   See |ale-integrations-local-executables|

test/command_callback/test_embertemplatelint_command_callbacks.vader

@@ -0,0 +1,17 @@
+Before:
+  call ale#assert#SetUpLinterTest('handlebars', 'embertemplatelint')
+
+  GivenCommandOutput ['1.6.0']
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(ember-template-lint executables runs the right command):
+  AssertLinter 'ember-template-lint',
+  \ ale#Escape('ember-template-lint') . ' --json --filename %s'
+
+Execute(old ember-template-lint executables runs the right command):
+  GivenCommandOutput []
+
+  AssertLinter 'ember-template-lint',
+  \ ale#Escape('ember-template-lint') . ' --json %t'

test/test_embertemplatelint_executable_detection.vader

@@ -1,22 +0,0 @@
-Before:
-  call ale#test#SetDirectory('/testplugin/test')
-
-  runtime ale_linters/handlebars/embertemplatelint.vim
-
-After:
-  call ale#test#RestoreDirectory()
-  call ale#linter#Reset()
-
-Execute(ember-template-lint executables runs the right command):
-  call ale#test#SetFilename('ember-template-lint-test-files/app/template.hbs')
-
-  AssertEqual
-  \ ale_linters#handlebars#embertemplatelint#GetCommand(bufnr(''), [2, 0, 0]),
-  \ '%e --json --filename %s'
-
-Execute(old ember-template-lint executables runs the right command):
-  call ale#test#SetFilename('ember-template-lint-test-files/app/template.hbs')
-
-  AssertEqual
-  \ ale_linters#handlebars#embertemplatelint#GetCommand(bufnr(''), [1, 5, 0]),
-  \ '%e --json %t'