Try to fix the tests

test/command_callback/test_c_ccls_command_callbacks.vader

@@ -8,6 +8,8 @@ After:
   call ale#assert#TearDownLinterTest()
 
 Execute(The project root should be detected correctly using compile_commands.json file):
+  call ale#test#SetFilename(tempname() . '/dummy.c')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('ccls_paths/with_compile_commands_json/dummy.c')
@@ -15,6 +17,8 @@ Execute(The project root should be detected correctly using compile_commands.jso
   AssertLSPProject ale#path#Simplify(g:dir . '/ccls_paths/with_compile_commands_json')
 
 Execute(The project root should be detected correctly using .ccls file):
+  call ale#test#SetFilename(tempname() . '/dummy.c')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('ccls_paths/with_ccls/dummy.c')
@@ -22,6 +26,8 @@ Execute(The project root should be detected correctly using .ccls file):
   AssertLSPProject ale#path#Simplify(g:dir . '/ccls_paths/with_ccls')
 
 Execute(The project root should be detected correctly using .ccls-root file):
+  call ale#test#SetFilename(tempname() . '/dummy.c')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('ccls_paths/with_ccls-root/dummy.c')

test/command_callback/test_c_clangd_command_callbacks.vader

@@ -14,6 +14,8 @@ Execute(The default executable should be correct):
   AssertLinter 'clangd', ale#Escape('clangd')
 
 Execute(The project root should be detected correctly):
+  call ale#test#SetFilename(tempname() . '/dummy.c')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('clangd_paths/dummy.c')

test/command_callback/test_c_cquery_command_callbacks.vader

@@ -5,6 +5,8 @@ After:
   call ale#assert#TearDownLinterTest()
 
 Execute(The project root should be detected correctly using compile_commands.json file):
+  call ale#test#SetFilename(tempname() . '/dummy.c')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('cquery_paths/dummy.c')
@@ -12,6 +14,8 @@ Execute(The project root should be detected correctly using compile_commands.jso
   AssertLSPProject ale#path#Simplify(g:dir . '/cquery_paths')
 
 Execute(The project root should be detected correctly using .cquery file):
+  call ale#test#SetFilename(tempname() . '/dummy.c')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('cquery_paths/with_cquery/dummy.c')

test/command_callback/test_cpp_ccls_command_callbacks.vader

@@ -8,6 +8,8 @@ After:
   call ale#assert#TearDownLinterTest()
 
 Execute(The project root should be detected correctly using compile_commands.json file):
+  call ale#test#SetFilename(tempname() . '/dummy.cpp')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('ccls_paths/with_compile_commands_json/dummy.cpp')
@@ -15,6 +17,8 @@ Execute(The project root should be detected correctly using compile_commands.jso
   AssertLSPProject ale#path#Simplify(g:dir . '/ccls_paths/with_compile_commands_json')
 
 Execute(The project root should be detected correctly using .ccls file):
+  call ale#test#SetFilename(tempname() . '/dummy.cpp')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('ccls_paths/with_ccls/dummy.cpp')
@@ -22,6 +26,8 @@ Execute(The project root should be detected correctly using .ccls file):
   AssertLSPProject ale#path#Simplify(g:dir . '/ccls_paths/with_ccls')
 
 Execute(The project root should be detected correctly using .ccls-root file):
+  call ale#test#SetFilename(tempname() . '/dummy.cpp')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('ccls_paths/with_ccls-root/dummy.cpp')

test/command_callback/test_cpp_cquery_command_callbacks.vader

@@ -8,6 +8,8 @@ After:
   call ale#assert#TearDownLinterTest()
 
 Execute(The project root should be detected correctly using compile_commands.json file):
+  call ale#test#SetFilename(tempname() . '/dummy.cpp')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('cquery_paths/dummy.cpp')
@@ -15,6 +17,8 @@ Execute(The project root should be detected correctly using compile_commands.jso
   AssertLSPProject ale#path#Simplify(g:dir . '/cquery_paths')
 
 Execute(The project root should be detected correctly using .cquery file):
+  call ale#test#SetFilename(tempname() . '/dummy.cpp')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('cquery_paths/with_cquery/dummy.cpp')

test/command_callback/test_objc_ccls_command_callbacks.vader

@@ -5,6 +5,8 @@ After:
   call ale#assert#TearDownLinterTest()
 
 Execute(The project root should be detected correctly using compile_commands.json file):
+  call ale#test#SetFilename(tempname() . '/dummy.m')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('ccls_paths/with_compile_commands_json/dummy.m')
@@ -12,6 +14,8 @@ Execute(The project root should be detected correctly using compile_commands.jso
   AssertLSPProject ale#path#Simplify(g:dir . '/ccls_paths/with_compile_commands_json')
 
 Execute(The project root should be detected correctly using .ccls file):
+  call ale#test#SetFilename(tempname() . '/dummy.m')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('ccls_paths/with_ccls/dummy.m')
@@ -19,6 +23,8 @@ Execute(The project root should be detected correctly using .ccls file):
   AssertLSPProject ale#path#Simplify(g:dir . '/ccls_paths/with_ccls')
 
 Execute(The project root should be detected correctly using .ccls-root file):
+  call ale#test#SetFilename(tempname() . '/dummy.m')
+
   AssertLSPProject ''
 
   call ale#test#SetFilename('ccls_paths/with_ccls-root/dummy.m')

test/lsp/test_lsp_root_detection.vader

@@ -56,7 +56,7 @@ Execute(The global variable is queried if the buffer-specific has no value):
 
   AssertLSPProject '/some/path'
 
-Execute(The default hook value is acceptable):
+Execute(No path should be returned by default):
-  call ale#test#SetFilename('other-file.c')
+  call ale#test#SetFilename(tempname() . '/other-file.c')
 
   AssertLSPProject ''