diff --git a/autoload/ale/test.vim b/autoload/ale/test.vim
index 5fe4bed..8fc4fe4 100644
--- a/autoload/ale/test.vim
+++ b/autoload/ale/test.vim
@@ -50,5 +50,5 @@ function! ale#test#SetFilename(path) abort
     \   ? a:path
     \   : l:dir . '/' . a:path
 
-    silent noautocmd execute 'file ' . fnameescape(ale#path#Winify(l:full_path))
+    silent! noautocmd execute 'file ' . fnameescape(ale#path#Winify(l:full_path))
 endfunction
diff --git a/test/command_callback/test_erlang_syntaxerl_command_callback.vader b/test/command_callback/test_erlang_syntaxerl_command_callback.vader
index 1df2be3..a9a1a50 100644
--- a/test/command_callback/test_erlang_syntaxerl_command_callback.vader
+++ b/test/command_callback/test_erlang_syntaxerl_command_callback.vader
@@ -6,13 +6,11 @@ Before:
 
   runtime ale_linters/erlang/syntaxerl.vim
 
-
 After:
   Restore
 
   call ale#linter#Reset()
 
-
 Execute (The executable should be correct):
   AssertEqual 'syntaxerl', ale_linters#erlang#syntaxerl#GetExecutable(bufnr(''))
 
@@ -25,22 +23,32 @@ Execute (The executable should be correct):
 
 Execute (The executable should be presented in the feature check command):
   let g:ale_erlang_syntaxerl_executable = '/some/other/syntaxerl'
-  AssertEqual "'/some/other/syntaxerl' -h", ale_linters#erlang#syntaxerl#FeatureCheck(bufnr(''))
+
+  AssertEqual
+  \ ale#Escape('/some/other/syntaxerl') . ' -h',
+  \ ale_linters#erlang#syntaxerl#FeatureCheck(bufnr(''))
 
   let b:ale_erlang_syntaxerl_executable = '/yet/another/syntaxerl'
-  AssertEqual "'/yet/another/syntaxerl' -h", ale_linters#erlang#syntaxerl#FeatureCheck(bufnr(''))
 
+  AssertEqual
+  \ ale#Escape('/yet/another/syntaxerl') . ' -h',
+  \ ale_linters#erlang#syntaxerl#FeatureCheck(bufnr(''))
 
 Execute (The executable should be presented in the command):
   let g:ale_erlang_syntaxerl_executable = '/some/other/syntaxerl'
-  AssertEqual "'/some/other/syntaxerl' %t", ale_linters#erlang#syntaxerl#GetCommand(bufnr(''), [])
+
+  AssertEqual
+  \ ale#Escape('/some/other/syntaxerl') . ' %t',
+  \ ale_linters#erlang#syntaxerl#GetCommand(bufnr(''), [])
 
   let b:ale_erlang_syntaxerl_executable = '/yet/another/syntaxerl'
-  AssertEqual "'/yet/another/syntaxerl' %t", ale_linters#erlang#syntaxerl#GetCommand(bufnr(''), [])
 
+  AssertEqual
+  \ ale#Escape('/yet/another/syntaxerl') . ' %t',
+  \ ale_linters#erlang#syntaxerl#GetCommand(bufnr(''), [])
 
 Execute (The -b option should be used when available):
-  AssertEqual "'syntaxerl' %t", ale_linters#erlang#syntaxerl#GetCommand(bufnr(''), [
+  AssertEqual ale#Escape('syntaxerl') . ' %t', ale_linters#erlang#syntaxerl#GetCommand(bufnr(''), [
   \   'Syntax checker for Erlang (0.14.0)',
   \   'Usage: syntaxerl [-d | --debug] <FILENAME>',
   \   '       syntaxerl <-h | --help>',
@@ -48,7 +56,7 @@ Execute (The -b option should be used when available):
   \   '  -h, --help     Show this message',
   \ ])
 
-  AssertEqual "'syntaxerl' -b %s %t", ale_linters#erlang#syntaxerl#GetCommand(bufnr(''), [
+  AssertEqual ale#Escape('syntaxerl') . ' -b %s %t', ale_linters#erlang#syntaxerl#GetCommand(bufnr(''), [
   \   'Syntax checker for Erlang (0.14.0)',
   \   'Usage: syntaxerl [-b | --base <FILENAME>] [-d | --debug] <FILENAME>',
   \   '       syntaxerl <-h | --help>',
diff --git a/test/command_callback/test_flake8_command_callback.vader b/test/command_callback/test_flake8_command_callback.vader
index c564b54..a510f4c 100644
--- a/test/command_callback/test_flake8_command_callback.vader
+++ b/test/command_callback/test_flake8_command_callback.vader
@@ -8,6 +8,8 @@ Before:
   unlet! g:ale_python_flake8_options
   unlet! g:ale_python_flake8_use_global
 
+  let b:bin_dir = has('win32') ? 'Scripts' : 'bin'
+
   runtime ale_linters/python/flake8.vim
   call ale#test#SetDirectory('/testplugin/test/command_callback')
 
@@ -16,6 +18,9 @@ After:
 
   unlet! g:ale_python_flake8_args
 
+  unlet! b:bin_dir
+  unlet! b:executable
+
   call ale#test#RestoreDirectory()
   call ale#linter#Reset()
   call ale_linters#python#flake8#ClearVersionCache()
@@ -25,26 +30,29 @@ Execute(The flake8 callbacks should return the correct default values):
   \ 'flake8',
   \ ale_linters#python#flake8#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''flake8'' --version',
+  \ ale#Escape('flake8') . ' --version',
   \ ale_linters#python#flake8#VersionCheck(bufnr(''))
   AssertEqual
-  \ '''flake8'' --format=default --stdin-display-name %s -',
+  \ ale#Escape('flake8') . ' --format=default --stdin-display-name %s -',
   \ ale_linters#python#flake8#GetCommand(bufnr(''), ['3.0.0'])
   " Try with older versions.
   call ale_linters#python#flake8#ClearVersionCache()
   AssertEqual
-  \ '''flake8'' --format=default -',
+  \ ale#Escape('flake8') . ' --format=default -',
   \ ale_linters#python#flake8#GetCommand(bufnr(''), ['2.9.9'])
 
 Execute(The flake8 command callback should let you set options):
   let g:ale_python_flake8_options = '--some-option'
 
   AssertEqual
-  \ '''flake8'' --some-option --format=default --stdin-display-name %s -',
+  \ ale#Escape('flake8')
+  \   . ' --some-option --format=default'
+  \   . ' --stdin-display-name %s -',
   \ ale_linters#python#flake8#GetCommand(bufnr(''), ['3.0.4'])
   call ale_linters#python#flake8#ClearVersionCache()
   AssertEqual
-  \ '''flake8'' --some-option --format=default -',
+  \ ale#Escape('flake8')
+  \   . ' --some-option --format=default -',
   \ ale_linters#python#flake8#GetCommand(bufnr(''), ['2.9.9'])
 
 Execute(You should be able to set a custom executable and it should be escaped):
@@ -54,23 +62,29 @@ Execute(You should be able to set a custom executable and it should be escaped):
   \ 'executable with spaces',
   \ ale_linters#python#flake8#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''executable with spaces'' --version',
+  \ ale#Escape('executable with spaces') . ' --version',
   \ ale_linters#python#flake8#VersionCheck(bufnr(''))
   AssertEqual
-  \ '''executable with spaces'' --format=default --stdin-display-name %s -',
+  \ ale#Escape('executable with spaces')
+  \   . ' --format=default'
+  \   . ' --stdin-display-name %s -',
   \ ale_linters#python#flake8#GetCommand(bufnr(''), ['3.0.0'])
 
 Execute(The flake8 callbacks should detect virtualenv directories):
   silent execute 'file ' . fnameescape(g:dir . '/python_paths/with_virtualenv/subdir/foo/bar.py')
 
+  let b:executable = ale#path#Winify(
+  \ g:dir . '/python_paths/with_virtualenv/env/' . b:bin_dir . '/flake8'
+  \)
+
   AssertEqual
-  \ g:dir . '/python_paths/with_virtualenv/env/bin/flake8',
+  \ b:executable,
   \ ale_linters#python#flake8#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''' . g:dir . '/python_paths/with_virtualenv/env/bin/flake8'' --version',
+  \ ale#Escape(b:executable) . ' --version',
   \ ale_linters#python#flake8#VersionCheck(bufnr(''))
   AssertEqual
-  \   '''' . g:dir . '/python_paths/with_virtualenv/env/bin/flake8'''
+  \ ale#Escape(b:executable)
   \   . ' --format=default --stdin-display-name %s -',
   \ ale_linters#python#flake8#GetCommand(bufnr(''), ['3.0.0'])
 
@@ -78,35 +92,35 @@ Execute(The FindProjectRoot should detect the project root directory for namespa
   silent execute 'file ' . fnameescape(g:dir . '/python_paths/namespace_package_manifest/namespace/foo/bar.py')
 
   AssertEqual
-  \ fnameescape(g:dir . '/python_paths/namespace_package_manifest'),
+  \ ale#path#Winify(g:dir . '/python_paths/namespace_package_manifest'),
   \ ale#python#FindProjectRoot(bufnr(''))
 
 Execute(The FindProjectRoot should detect the project root directory for namespace package via setup.cf):
   silent execute 'file ' . fnameescape(g:dir . '/python_paths/namespace_package_setup/namespace/foo/bar.py')
 
   AssertEqual
-  \ fnameescape(g:dir . '/python_paths/namespace_package_setup'),
+  \ ale#path#Winify(g:dir . '/python_paths/namespace_package_setup'),
   \ ale#python#FindProjectRoot(bufnr(''))
 
 Execute(The FindProjectRoot should detect the project root directory for namespace package via pytest.ini):
   silent execute 'file ' . fnameescape(g:dir . '/python_paths/namespace_package_pytest/namespace/foo/bar.py')
 
   AssertEqual
-  \ fnameescape(g:dir . '/python_paths/namespace_package_pytest'),
+  \ ale#path#Winify(g:dir . '/python_paths/namespace_package_pytest'),
   \ ale#python#FindProjectRoot(bufnr(''))
 
 Execute(The FindProjectRoot should detect the project root directory for namespace package via tox.ini):
   silent execute 'file ' . fnameescape(g:dir . '/python_paths/namespace_package_tox/namespace/foo/bar.py')
 
   AssertEqual
-  \ fnameescape(g:dir . '/python_paths/namespace_package_tox'),
+  \ ale#path#Winify(g:dir . '/python_paths/namespace_package_tox'),
   \ ale#python#FindProjectRoot(bufnr(''))
 
 Execute(The FindProjectRoot should detect the project root directory for non-namespace package):
   silent execute 'file ' . fnameescape(g:dir . '/python_paths/no_virtualenv/subdir/foo/bar.py')
 
   AssertEqual
-  \ fnameescape(g:dir . '/python_paths/no_virtualenv/subdir'),
+  \ ale#path#Winify(g:dir . '/python_paths/no_virtualenv/subdir'),
   \ ale#python#FindProjectRoot(bufnr(''))
 
 " Some users currently run flake8 this way, so we should support it.
@@ -120,10 +134,10 @@ Execute(Using `python -m flake8` should be supported for running flake8):
   \ 'python',
   \ ale_linters#python#flake8#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''python'' -m flake8 --version',
+  \ ale#Escape('python') . ' -m flake8 --version',
   \ ale_linters#python#flake8#VersionCheck(bufnr(''))
   AssertEqual
-  \ '''python'' -m flake8 --some-option --format=default -',
+  \ ale#Escape('python') . ' -m flake8 --some-option --format=default -',
   \ ale_linters#python#flake8#GetCommand(bufnr(''), ['2.9.9'])
 
   call ale_linters#python#flake8#ClearVersionCache()
@@ -135,10 +149,10 @@ Execute(Using `python -m flake8` should be supported for running flake8):
   \ 'python',
   \ ale_linters#python#flake8#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''python'' -m flake8 --version',
+  \ ale#Escape('python') . ' -m flake8 --version',
   \ ale_linters#python#flake8#VersionCheck(bufnr(''))
   AssertEqual
-  \ '''python''   -m flake8 --some-option --format=default -',
+  \ ale#Escape('python') . '   -m flake8 --some-option --format=default -',
   \ ale_linters#python#flake8#GetCommand(bufnr(''), ['2.9.9'])
 
 Execute(Using `python2 -m flake8` should be use with the old args option):
@@ -157,8 +171,8 @@ Execute(Using `python2 -m flake8` should be use with the old args option):
   \ 'python2',
   \ ale_linters#python#flake8#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''python2'' -m flake8 --version',
+  \ ale#Escape('python2') . ' -m flake8 --version',
   \ ale_linters#python#flake8#VersionCheck(bufnr(''))
   AssertEqual
-  \ '''python2'' -m flake8 --format=default -',
+  \ ale#Escape('python2') . ' -m flake8 --format=default -',
   \ ale_linters#python#flake8#GetCommand(bufnr(''), ['2.9.9'])
diff --git a/test/command_callback/test_fusionlint_command_callback.vader b/test/command_callback/test_fusionlint_command_callback.vader
index 5398066..34a4413 100644
--- a/test/command_callback/test_fusionlint_command_callback.vader
+++ b/test/command_callback/test_fusionlint_command_callback.vader
@@ -1,24 +1,34 @@
 Before:
+  Save g:ale_fuse_fusionlint_options
+  Save g:ale_fuse_fusionlint_executable
+
+  unlet! g:ale_fuse_fusionlint_options
+  unlet! g:ale_fuse_fusionlint_executable
+
   runtime ale_linters/fuse/fusionlint.vim
 
 After:
+  Restore
+
   call ale#linter#Reset()
-  let g:ale_fuse_fusionlint_options = ''
-  let g:ale_fuse_fusionlint_executable = 'fusion-lint'
 
 Execute(The fuse fusionlint command callback should return the correct default string):
-  AssertEqual '''fusion-lint'' --filename %s -i',
+  AssertEqual ale#Escape('fusion-lint') . ' --filename %s -i',
   \ join(split(ale_linters#fuse#fusionlint#GetCommand(1)))
 
 Execute(The fuse fusionlint command callback should let you set options):
   let g:ale_fuse_fusionlint_options = '--example-option argument'
 
-  AssertEqual '''fusion-lint'' --example-option argument --filename %s -i',
+  AssertEqual
+  \ ale#Escape('fusion-lint')
+  \   . ' --example-option argument --filename %s -i',
   \ join(split(ale_linters#fuse#fusionlint#GetCommand(1)))
 
 Execute(The fusionlint executable should be configurable):
   let g:ale_fuse_fusionlint_executable = 'util/linter.fuse'
 
   AssertEqual 'util/linter.fuse', ale_linters#fuse#fusionlint#GetExecutable(1)
-  AssertEqual '''util/linter.fuse'' --filename %s -i',
+  AssertEqual
+  \ ale#Escape('util/linter.fuse')
+  \   . ' --filename %s -i',
   \ join(split(ale_linters#fuse#fusionlint#GetCommand(1)))
diff --git a/test/command_callback/test_javac_command_callback.vader b/test/command_callback/test_javac_command_callback.vader
index 706839e..8033e4f 100644
--- a/test/command_callback/test_javac_command_callback.vader
+++ b/test/command_callback/test_javac_command_callback.vader
@@ -1,97 +1,151 @@
 Before:
+  call ale#test#SetDirectory('/testplugin/test/command_callback')
+
+  Save g:ale_java_javac_options
+  Save g:ale_java_javac_classpath
+
+  unlet! g:ale_java_javac_options
+  unlet! g:ale_java_javac_classpath
+
+  let g:cp_sep = has('unix') ? ':' : ';'
+
+  function! GetCommand(previous_output) abort
+    let l:command = ale_linters#java#javac#GetCommand(
+    \ bufnr(''),
+    \ a:previous_output
+    \)
+
+    let l:split_command = split(l:command)
+    let l:index = index(l:split_command, '-d')
+
+    let l:split_command[l:index + 1] = 'TEMP'
+
+    return join(l:split_command)
+  endfunction
+
   runtime ale_linters/java/javac.vim
   call ale#engine#InitBufferInfo(bufnr(''))
 
-  silent! cd /testplugin/test/command_callback
+  call ale#test#SetFilename('dummy.java')
 
 After:
+  call ale#test#RestoreDirectory()
+
+  Restore
+
+  unlet! g:cp_sep
+
+  delfunction GetCommand
+
   call ale#linter#Reset()
   " We need to clean up the buffer to remove the temporary directories created
   " for the command.
   call ale#engine#Cleanup(bufnr(''))
-  let g:ale_java_javac_options = ''
-  let g:ale_java_javac_classpath = ''
 
 Execute(The javac callback should return the correct default value):
-  let b:command = ale_linters#java#javac#GetCommand(bufnr(''), [])
-
-  Assert match(b:command, '\v^javac +-Xlint +-d +''/tmp/[0-9a-zA-Z/]+'' +\%t$') >= 0,
-  \ 'Invalid command string: ' . b:command
+  AssertEqual 'javac -Xlint -d TEMP %t', GetCommand([])
 
 Execute(The javac callback should use g:ale_java_javac_classpath correctly):
   let g:ale_java_javac_classpath = 'foo.jar'
 
-  let b:command = ale_linters#java#javac#GetCommand(bufnr(''), [])
-
-  Assert match(b:command, '\v^javac +-Xlint +-cp ''+foo\.jar'' +-d ''+/tmp/[0-9a-zA-Z/]+'' +\%t$') >= 0,
-  \ 'Invalid command string: ' . b:command
+  AssertEqual
+  \ 'javac -Xlint'
+  \   . ' -cp ' . ale#Escape('foo.jar')
+  \   . ' -d TEMP %t',
+  \ GetCommand([])
 
 Execute(The javac callback should include discovered classpaths):
-  let b:command = ale_linters#java#javac#GetCommand(bufnr(''), [
-  \ '[DEBUG] Ignore this.',
-  \ '[INFO] Something we should ignore.',
-  \ '/foo/bar.jar',
-  \ '/xyz/abc.jar',
-  \])
-
-  Assert match(b:command, '\v^javac +-Xlint +-cp ''+/foo/bar\.jar:/xyz/abc\.jar'' +-d +''/tmp/[0-9a-zA-Z/]+'' +\%t$') >= 0,
-  \ 'Invalid command string: ' . b:command
+  AssertEqual
+  \ 'javac -Xlint -cp '
+  \   . ale#Escape(join(['/foo/bar.jar', '/xyz/abc.jar'], g:cp_sep))
+  \   . ' -d TEMP %t',
+  \ GetCommand([
+  \   '[DEBUG] Ignore this.',
+  \   '[INFO] Something we should ignore.',
+  \   '/foo/bar.jar',
+  \   '/xyz/abc.jar',
+  \ ])
 
 Execute(The javac callback should combine discovered classpaths and manual ones):
   let g:ale_java_javac_classpath = 'configured.jar'
 
-  let b:command = ale_linters#java#javac#GetCommand(bufnr(''), [
-  \ '[DEBUG] Ignore this.',
-  \ '[INFO] Something we should ignore.',
-  \ '/foo/bar.jar',
-  \ '/xyz/abc.jar',
-  \])
+  AssertEqual
+  \ 'javac -Xlint -cp '
+  \   . ale#Escape(join(
+  \     [
+  \       '/foo/bar.jar',
+  \       '/xyz/abc.jar',
+  \       'configured.jar',
+  \     ],
+  \     g:cp_sep
+  \   ))
+  \   . ' -d TEMP %t',
+  \ GetCommand([
+  \   '[DEBUG] Ignore this.',
+  \   '[INFO] Something we should ignore.',
+  \   '/foo/bar.jar',
+  \   '/xyz/abc.jar',
+  \ ])
 
-  Assert match(b:command, '\v^javac +-Xlint +-cp +''/foo/bar\.jar:/xyz/abc\.jar:configured\.jar'' +-d ''+/tmp/[0-9a-zA-Z/]+'' +\%t$') >= 0,
-  \ 'Invalid command string: ' . b:command
+  let g:ale_java_javac_classpath = 'configured.jar' . g:cp_sep . 'configured2.jar'
 
-  let g:ale_java_javac_classpath = 'configured.jar:configured2.jar'
-
-  let b:command = ale_linters#java#javac#GetCommand(bufnr(''), [
-  \ '[DEBUG] Ignore this.',
-  \ '[INFO] Something we should ignore.',
-  \ '/foo/bar.jar',
-  \ '/xyz/abc.jar',
-  \])
-
-  Assert match(b:command, '\v^javac +-Xlint +-cp +''/foo/bar\.jar:/xyz/abc\.jar:configured\.jar:configured2\.jar'' +-d +''/tmp/[0-9a-zA-Z/]+'' +\%t$') >= 0,
-  \ 'Invalid command string: ' . b:command
+  AssertEqual
+  \ 'javac -Xlint -cp '
+  \   . ale#Escape(join(
+  \     [
+  \       '/foo/bar.jar',
+  \       '/xyz/abc.jar',
+  \       'configured.jar',
+  \       'configured2.jar',
+  \     ],
+  \     g:cp_sep
+  \   ))
+  \   . ' -d TEMP %t',
+  \ GetCommand([
+  \   '[DEBUG] Ignore this.',
+  \   '[INFO] Something we should ignore.',
+  \   '/foo/bar.jar',
+  \   '/xyz/abc.jar',
+  \ ])
 
 Execute(The javac callback should detect source directories):
   call ale#engine#Cleanup(bufnr(''))
   :e! java_paths/src/main/java/com/something/dummy
   call ale#engine#InitBufferInfo(bufnr(''))
 
-  let b:command = ale_linters#java#javac#GetCommand(bufnr(''), [])
-
-  Assert match(b:command, '\v^javac +-Xlint +-sourcepath ''/.*java_paths/src/main/java/'' +-d +''/tmp/[0-9a-zA-Z/]+'' +\%t$') >= 0,
-  \ 'Invalid command string: ' . b:command
+  AssertEqual
+  \ 'javac -Xlint'
+  \   . ' -sourcepath ' . ale#Escape(
+  \     ale#path#Winify(g:dir . '/java_paths/src/main/java/')
+  \   )
+  \   . ' -d TEMP %t',
+  \ GetCommand([])
 
 Execute(The javac callback should combine detected source directories and classpaths):
   call ale#engine#Cleanup(bufnr(''))
-  :e! java_paths/src/main/java/com/something/dummy
+  call ale#test#SetFilename('java_paths/src/main/java/com/something/dummy.java')
   call ale#engine#InitBufferInfo(bufnr(''))
 
-  let b:command = ale_linters#java#javac#GetCommand(bufnr(''), [
-  \ '[DEBUG] Ignore this.',
-  \ '[INFO] Something we should ignore.',
-  \ '/foo/bar.jar',
-  \ '/xyz/abc.jar',
-  \])
-
-  Assert match(b:command, '\v^javac +-Xlint +-cp +''/foo/bar\.jar:/xyz/abc\.jar'' +-sourcepath ''/.*java_paths/src/main/java/'' +-d +''/tmp/[0-9a-zA-Z/]+'' +\%t$') >= 0,
-  \ 'Invalid command string: ' . b:command
+  AssertEqual
+  \ 'javac -Xlint'
+  \   . ' -cp ' . ale#Escape(join(['/foo/bar.jar', '/xyz/abc.jar'], g:cp_sep))
+  \   . ' -sourcepath ' . ale#Escape(
+  \     ale#path#Winify(g:dir . '/java_paths/src/main/java/')
+  \   )
+  \   . ' -d TEMP %t',
+  \ GetCommand([
+  \   '[DEBUG] Ignore this.',
+  \   '[INFO] Something we should ignore.',
+  \   '/foo/bar.jar',
+  \   '/xyz/abc.jar',
+  \ ])
 
 Execute(The javac callback should use g:ale_java_javac_options correctly):
-
   let g:ale_java_javac_options = '--anything --else'
 
   let b:command = ale_linters#java#javac#GetCommand(bufnr(''), [])
 
-  Assert match(b:command, '\v^javac +-Xlint +-d +''/tmp/[0-9a-zA-Z/]+'' --anything --else +\%t$') >= 0,
-  \ 'Invalid command string: ' . b:command
+  AssertEqual
+  \ 'javac -Xlint'
+  \   . ' -d TEMP --anything --else %t',
+  \ GetCommand([])
diff --git a/test/command_callback/test_jscs_command_callback.vader b/test/command_callback/test_jscs_command_callback.vader
index 8245337..f118c03 100644
--- a/test/command_callback/test_jscs_command_callback.vader
+++ b/test/command_callback/test_jscs_command_callback.vader
@@ -7,19 +7,19 @@ After:
 
 Execute(Should return the correct default values):
   AssertEqual
-  \  'jscs',
-  \   ale_linters#javascript#jscs#GetExecutable(bufnr(''))
+  \ 'jscs',
+  \ ale_linters#javascript#jscs#GetExecutable(bufnr(''))
   AssertEqual
-  \   '''jscs'' --reporter inline --no-colors -',
-  \   ale_linters#javascript#jscs#GetCommand(bufnr(''))
+  \ ale#Escape('jscs') . ' --reporter inline --no-colors -',
+  \ ale_linters#javascript#jscs#GetCommand(bufnr(''))
 
 
 Execute(Should allow using a custom executable):
   let g:ale_javascript_jscs_executable = 'foobar'
 
   AssertEqual
-  \   'foobar',
-  \   ale_linters#javascript#jscs#GetExecutable(bufnr(''))
+  \ 'foobar',
+  \ ale_linters#javascript#jscs#GetExecutable(bufnr(''))
   AssertEqual
-  \   '''foobar'' --reporter inline --no-colors -',
-  \   ale_linters#javascript#jscs#GetCommand(bufnr(''))
+  \ ale#Escape('foobar') . ' --reporter inline --no-colors -',
+  \ ale_linters#javascript#jscs#GetCommand(bufnr(''))
diff --git a/test/command_callback/test_luacheck_command_callback.vader b/test/command_callback/test_luacheck_command_callback.vader
index c4ee98a..6f7f3a0 100644
--- a/test/command_callback/test_luacheck_command_callback.vader
+++ b/test/command_callback/test_luacheck_command_callback.vader
@@ -7,18 +7,18 @@ After:
   let g:ale_lua_luacheck_executable = 'luacheck'
 
 Execute(The lua luacheck command callback should return the correct default string):
-  AssertEqual '''luacheck'' --formatter plain --codes --filename %s -',
+  AssertEqual ale#Escape('luacheck') . ' --formatter plain --codes --filename %s -',
   \ join(split(ale_linters#lua#luacheck#GetCommand(1)))
 
 Execute(The lua luacheck command callback should let you set options):
   let g:ale_lua_luacheck_options = '--config filename'
 
-  AssertEqual '''luacheck'' --config filename --formatter plain --codes --filename %s -',
+  AssertEqual ale#Escape('luacheck') . ' --config filename --formatter plain --codes --filename %s -',
   \ join(split(ale_linters#lua#luacheck#GetCommand(1)))
 
 Execute(The luacheck executable should be configurable):
   let g:ale_lua_luacheck_executable = 'luacheck.sh'
 
   AssertEqual 'luacheck.sh', ale_linters#lua#luacheck#GetExecutable(1)
-  AssertEqual '''luacheck.sh'' --formatter plain --codes --filename %s -',
+  AssertEqual ale#Escape('luacheck.sh') . ' --formatter plain --codes --filename %s -',
   \ join(split(ale_linters#lua#luacheck#GetCommand(1)))
diff --git a/test/command_callback/test_mypy_command_callback.vader b/test/command_callback/test_mypy_command_callback.vader
index 8df7193..4ccc008 100644
--- a/test/command_callback/test_mypy_command_callback.vader
+++ b/test/command_callback/test_mypy_command_callback.vader
@@ -1,20 +1,35 @@
 Before:
+  Save g:ale_python_mypy_executable
+  Save g:ale_python_mypy_options
+  Save g:ale_python_mypy_use_global
+
+  unlet! g:ale_python_mypy_executable
+  unlet! g:ale_python_mypy_options
+  unlet! g:ale_python_mypy_use_global
+
+  let b:bin_dir = has('win32') ? 'Scripts' : 'bin'
+
   runtime ale_linters/python/mypy.vim
+
   call ale#test#SetDirectory('/testplugin/test/command_callback')
+  call ale#test#SetFilename('test.py')
 
 After:
+  Restore
+
+  unlet! b:bin_dir
+  unlet! b:executable
+
   call ale#test#RestoreDirectory()
   call ale#linter#Reset()
-  let g:ale_python_mypy_executable = 'mypy'
-  let g:ale_python_mypy_options = ''
-  let g:ale_python_mypy_use_global = 0
 
 Execute(The mypy callbacks should return the correct default values):
   AssertEqual
   \ 'mypy',
   \ ale_linters#python#mypy#GetExecutable(bufnr(''))
   AssertEqual
-  \ 'cd ''' . g:dir . ''' && ''mypy'' --show-column-numbers  '
+  \ 'cd ' . ale#Escape(g:dir) . ' && ' . ale#Escape('mypy')
+  \   . ' --show-column-numbers  '
   \   . '--shadow-file %s %t %s',
   \ ale_linters#python#mypy#GetCommand(bufnr(''))
 
@@ -25,7 +40,8 @@ Execute(The mypy executable should be configurable, and escaped properly):
   \ 'executable with spaces',
   \ ale_linters#python#mypy#GetExecutable(bufnr(''))
   AssertEqual
-  \ 'cd ''' . g:dir . ''' && ''executable with spaces'' --show-column-numbers  '
+  \ 'cd ' . ale#Escape(g:dir) . ' && ' . ale#Escape('executable with spaces')
+  \   . ' --show-column-numbers  '
   \   . '--shadow-file %s %t %s',
   \ ale_linters#python#mypy#GetCommand(bufnr(''))
 
@@ -33,7 +49,8 @@ Execute(The mypy command callback should let you set options):
   let g:ale_python_mypy_options = '--some-option'
 
   AssertEqual
-  \ 'cd ''' . g:dir . ''' && ''mypy'' --show-column-numbers --some-option '
+  \ 'cd ' . ale#Escape(g:dir) . ' && ' . ale#Escape('mypy')
+  \   . ' --show-column-numbers --some-option '
   \   . '--shadow-file %s %t %s',
   \ ale_linters#python#mypy#GetCommand(bufnr(''))
 
@@ -44,19 +61,24 @@ Execute(The mypy command should switch directories to the detected project root)
   \ 'mypy',
   \ ale_linters#python#mypy#GetExecutable(bufnr(''))
   AssertEqual
-  \ 'cd ''' . g:dir . '/python_paths/no_virtualenv/subdir'' && ''mypy'' --show-column-numbers  '
+  \ 'cd ' . ale#Escape(ale#path#Winify(g:dir . '/python_paths/no_virtualenv/subdir'))
+  \   . ' && ' . ale#Escape('mypy')
+  \   . ' --show-column-numbers  '
   \   . '--shadow-file %s %t %s',
   \ ale_linters#python#mypy#GetCommand(bufnr(''))
 
 Execute(The mypy callbacks should detect virtualenv directories and switch to the project root):
   silent execute 'file ' . fnameescape(g:dir . '/python_paths/with_virtualenv/subdir/foo/bar.py')
 
+  let b:executable = ale#path#Winify(g:dir . '/python_paths/with_virtualenv/env/' . b:bin_dir . '/mypy')
+
   AssertEqual
-  \ g:dir . '/python_paths/with_virtualenv/env/bin/mypy',
+  \ b:executable,
   \ ale_linters#python#mypy#GetExecutable(bufnr(''))
   AssertEqual
-  \   'cd ''' . g:dir . '/python_paths/with_virtualenv/subdir'' && '''
-  \   . g:dir . '/python_paths/with_virtualenv/env/bin/mypy'' --show-column-numbers  '
+  \   'cd ' . ale#Escape(ale#path#Winify(g:dir . '/python_paths/with_virtualenv/subdir'))
+  \   . ' && ' . ale#Escape(b:executable)
+  \   . ' --show-column-numbers  '
   \   . '--shadow-file %s %t %s',
   \ ale_linters#python#mypy#GetCommand(bufnr(''))
 
@@ -68,6 +90,8 @@ Execute(You should able able to use the global mypy instead):
   \ 'mypy',
   \ ale_linters#python#mypy#GetExecutable(bufnr(''))
   AssertEqual
-  \ 'cd ''' . g:dir . '/python_paths/with_virtualenv/subdir'' && ''mypy'' --show-column-numbers  '
+  \   'cd ' . ale#Escape(ale#path#Winify(g:dir . '/python_paths/with_virtualenv/subdir'))
+  \   . ' && ' . ale#Escape('mypy')
+  \   . ' --show-column-numbers  '
   \   . '--shadow-file %s %t %s',
   \ ale_linters#python#mypy#GetCommand(bufnr(''))
diff --git a/test/command_callback/test_php_langserver_callbacks.vader b/test/command_callback/test_php_langserver_callbacks.vader
index 38630f4..0c7e69e 100644
--- a/test/command_callback/test_php_langserver_callbacks.vader
+++ b/test/command_callback/test_php_langserver_callbacks.vader
@@ -33,13 +33,13 @@ Execute(Vendor executables should be detected):
   call ale#test#SetFilename('php-langserver-project/test.php')
 
   AssertEqual
-  \ g:dir . '/php-langserver-project/vendor/bin/php-language-server.php',
+  \ ale#path#Winify(g:dir . '/php-langserver-project/vendor/bin/php-language-server.php'),
   \ ale_linters#php#langserver#GetExecutable(bufnr(''))
   AssertEqual
-  \ 'php ' . ale#Escape(
+  \ 'php ' . ale#Escape(ale#path#Winify(
   \   g:dir
   \   . '/php-langserver-project/vendor/bin/php-language-server.php'
-  \ ),
+  \ )),
   \ ale_linters#php#langserver#GetCommand(bufnr(''))
 
 Execute(The language string should be correct):
diff --git a/test/command_callback/test_puglint_command_callback.vader b/test/command_callback/test_puglint_command_callback.vader
index 6d18989..1194658 100644
--- a/test/command_callback/test_puglint_command_callback.vader
+++ b/test/command_callback/test_puglint_command_callback.vader
@@ -21,11 +21,12 @@ Execute(puglint should detect local executables and package.json):
   call ale#test#SetFilename('puglint_project/test.pug')
 
   AssertEqual
-  \ g:dir . '/puglint_project/node_modules/.bin/pug-lint',
+  \ ale#path#Winify(g:dir . '/puglint_project/node_modules/.bin/pug-lint'),
   \ ale_linters#pug#puglint#GetExecutable(bufnr(''))
+
   AssertEqual
-  \ ale#Escape(g:dir . '/puglint_project/node_modules/.bin/pug-lint')
-  \   . ' -c ' . ale#Escape(g:dir . '/puglint_project/package.json')
+  \ ale#Escape(ale#path#Winify(g:dir . '/puglint_project/node_modules/.bin/pug-lint'))
+  \   . ' -c ' . ale#Escape(ale#path#Winify(g:dir . '/puglint_project/package.json'))
   \   . ' -r inline %t',
   \ ale_linters#pug#puglint#GetCommand(bufnr(''))
 
@@ -35,9 +36,10 @@ Execute(puglint should use global executables if configured):
   call ale#test#SetFilename('puglint_project/test.pug')
 
   AssertEqual 'pug-lint', ale_linters#pug#puglint#GetExecutable(bufnr(''))
+
   AssertEqual
   \ ale#Escape('pug-lint')
-  \   . ' -c ' . ale#Escape(g:dir . '/puglint_project/package.json')
+  \   . ' -c ' . ale#Escape(ale#path#Winify(g:dir . '/puglint_project/package.json'))
   \   . ' -r inline %t',
   \ ale_linters#pug#puglint#GetCommand(bufnr(''))
 
@@ -45,8 +47,8 @@ Execute(puglint should detect .pug-lintrc):
   call ale#test#SetFilename('puglint_project/puglint_rc_dir/subdir/test.pug')
 
   AssertEqual
-  \ ale#Escape(g:dir . '/puglint_project/node_modules/.bin/pug-lint')
-  \   . ' -c ' . ale#Escape(g:dir . '/puglint_project/puglint_rc_dir/.pug-lintrc')
+  \ ale#Escape(ale#path#Winify(g:dir . '/puglint_project/node_modules/.bin/pug-lint'))
+  \   . ' -c ' . ale#Escape(ale#path#Winify(g:dir . '/puglint_project/puglint_rc_dir/.pug-lintrc'))
   \   . ' -r inline %t',
   \ ale_linters#pug#puglint#GetCommand(bufnr(''))
 
@@ -54,8 +56,8 @@ Execute(puglint should detect .pug-lintrc.js):
   call ale#test#SetFilename('puglint_project/puglint_rc_js_dir/subdir/test.pug')
 
   AssertEqual
-  \ ale#Escape(g:dir . '/puglint_project/node_modules/.bin/pug-lint')
-  \   . ' -c ' . ale#Escape(g:dir . '/puglint_project/puglint_rc_js_dir/.pug-lintrc.js')
+  \ ale#Escape(ale#path#Winify(g:dir . '/puglint_project/node_modules/.bin/pug-lint'))
+  \   . ' -c ' . ale#Escape(ale#path#Winify(g:dir . '/puglint_project/puglint_rc_js_dir/.pug-lintrc.js'))
   \   . ' -r inline %t',
   \ ale_linters#pug#puglint#GetCommand(bufnr(''))
 
@@ -63,7 +65,7 @@ Execute(puglint should detect .pug-lintrc.json):
   call ale#test#SetFilename('puglint_project/puglint_rc_json_dir/subdir/test.pug')
 
   AssertEqual
-  \ ale#Escape(g:dir . '/puglint_project/node_modules/.bin/pug-lint')
-  \   . ' -c ' . ale#Escape(g:dir . '/puglint_project/puglint_rc_json_dir/.pug-lintrc.json')
+  \ ale#Escape(ale#path#Winify(g:dir . '/puglint_project/node_modules/.bin/pug-lint'))
+  \   . ' -c ' . ale#Escape(ale#path#Winify(g:dir . '/puglint_project/puglint_rc_json_dir/.pug-lintrc.json'))
   \   . ' -r inline %t',
   \ ale_linters#pug#puglint#GetCommand(bufnr(''))
diff --git a/test/command_callback/test_pycodestyle_command_callback.vader b/test/command_callback/test_pycodestyle_command_callback.vader
index a516346..58aefa2 100644
--- a/test/command_callback/test_pycodestyle_command_callback.vader
+++ b/test/command_callback/test_pycodestyle_command_callback.vader
@@ -9,15 +9,17 @@ After:
   Restore
 
 Execute(The pycodestyle command callback should return default string):
-  AssertEqual '''pycodestyle''  -',
+  AssertEqual ale#Escape('pycodestyle') . '  -',
   \ ale_linters#python#pycodestyle#GetCommand(bufnr(''))
 
 Execute(The pycodestyle command callback should allow options):
   let g:ale_python_pycodestyle_options = '--exclude=test*.py'
-  AssertEqual '''pycodestyle'' --exclude=test*.py -',
+
+  AssertEqual ale#Escape('pycodestyle') . ' --exclude=test*.py -',
   \ ale_linters#python#pycodestyle#GetCommand(bufnr(''))
 
 Execute(The pycodestyle executable should be configurable):
   let g:ale_python_pycodestyle_executable = '~/.local/bin/pycodestyle'
-  AssertEqual '''~/.local/bin/pycodestyle''  -',
+
+  AssertEqual ale#Escape('~/.local/bin/pycodestyle') . '  -',
   \ ale_linters#python#pycodestyle#GetCommand(bufnr(''))
diff --git a/test/command_callback/test_pylint_command_callback.vader b/test/command_callback/test_pylint_command_callback.vader
index f8f44ab..447409b 100644
--- a/test/command_callback/test_pylint_command_callback.vader
+++ b/test/command_callback/test_pylint_command_callback.vader
@@ -1,22 +1,34 @@
 Before:
+  Save g:ale_python_pylint_executable
+  Save g:ale_python_pylint_options
+  Save g:ale_python_pylint_use_global
+
+  unlet! g:ale_python_pylint_executable
+  unlet! g:ale_python_pylint_options
+  unlet! g:ale_python_pylint_use_global
+
   runtime ale_linters/python/pylint.vim
   call ale#test#SetDirectory('/testplugin/test/command_callback')
 
+  let b:bin_dir = has('win32') ? 'Scripts' : 'bin'
+
   let b:command_tail = ' --output-format text --msg-template="{path}:{line}:{column}: {msg_id} ({symbol}) {msg}" --reports n %s'
 
 After:
+  Restore
+
   call ale#test#RestoreDirectory()
   call ale#linter#Reset()
-  let g:ale_python_pylint_executable = 'pylint'
-  let g:ale_python_pylint_options = ''
-  let g:ale_python_pylint_use_global = 0
+
+  unlet! b:bin_dir
+  unlet! b:executable
 
 Execute(The pylint callbacks should return the correct default values):
   AssertEqual
   \ 'pylint',
   \ ale_linters#python#pylint#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''pylint'' ' . b:command_tail,
+  \ ale#Escape('pylint') . ' ' . b:command_tail,
   \ ale_linters#python#pylint#GetCommand(bufnr(''))
 
 Execute(The pylint executable should be configurable, and escaped properly):
@@ -26,14 +38,14 @@ Execute(The pylint executable should be configurable, and escaped properly):
   \ 'executable with spaces',
   \ ale_linters#python#pylint#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''executable with spaces'' ' . b:command_tail,
+  \ ale#Escape('executable with spaces') . ' ' . b:command_tail,
   \ ale_linters#python#pylint#GetCommand(bufnr(''))
 
 Execute(The pylint command callback should let you set options):
   let g:ale_python_pylint_options = '--some-option'
 
   AssertEqual
-  \ '''pylint'' --some-option' . b:command_tail,
+  \ ale#Escape('pylint') . ' --some-option' . b:command_tail,
   \ ale_linters#python#pylint#GetCommand(bufnr(''))
 
 Execute(The pylint callbacks shouldn't detect virtualenv directories where they don't exist):
@@ -43,17 +55,22 @@ Execute(The pylint callbacks shouldn't detect virtualenv directories where they
   \ 'pylint',
   \ ale_linters#python#pylint#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''pylint'' ' . b:command_tail,
+  \ ale#Escape('pylint') . ' ' . b:command_tail,
   \ ale_linters#python#pylint#GetCommand(bufnr(''))
 
 Execute(The pylint callbacks should detect virtualenv directories):
   silent execute 'file ' . fnameescape(g:dir . '/python_paths/with_virtualenv/subdir/foo/bar.py')
 
+  let b:executable = ale#path#Winify(
+  \ g:dir . '/python_paths/with_virtualenv/env/' . b:bin_dir . '/pylint'
+  \)
+
   AssertEqual
-  \ g:dir . '/python_paths/with_virtualenv/env/bin/pylint',
+  \ b:executable,
   \ ale_linters#python#pylint#GetExecutable(bufnr(''))
+
   AssertEqual
-  \ ''''. g:dir . '/python_paths/with_virtualenv/env/bin/pylint'' ' . b:command_tail,
+  \ ale#Escape(b:executable) . ' ' . b:command_tail,
   \ ale_linters#python#pylint#GetCommand(bufnr(''))
 
 Execute(You should able able to use the global pylint instead):
@@ -64,5 +81,5 @@ Execute(You should able able to use the global pylint instead):
   \ 'pylint',
   \ ale_linters#python#pylint#GetExecutable(bufnr(''))
   AssertEqual
-  \ '''pylint'' ' . b:command_tail,
+  \ ale#Escape('pylint') . ' ' . b:command_tail,
   \ ale_linters#python#pylint#GetCommand(bufnr(''))