Fix #859 Include test and jaxb Java source paths when available

ale_linters/java/javac.vim

@@ -41,9 +41,33 @@ function! ale_linters#java#javac#GetCommand(buffer, import_paths) abort
 
     " Find the src directory, for files in this project.
     let l:src_dir = ale#path#FindNearestDirectory(a:buffer, 'src/main/java')
+    let l:sp_dirs = []
 
     if !empty(l:src_dir)
-        let l:sp_option = '-sourcepath ' . ale#Escape(l:src_dir)
+        call add(l:sp_dirs, l:src_dir)
+
+        " Automatically include the jaxb directory too, if it's there.
+        let l:jaxb_dir = fnamemodify(l:src_dir, ':h:h')
+        \   . (has('win32') ? '\jaxb\' : '/jaxb/')
+
+        if isdirectory(l:jaxb_dir)
+            call add(l:sp_dirs, l:jaxb_dir)
+        endif
+
+        " Automatically include the test directory, but only for test code.
+        if expand('#' . a:buffer . ':p') =~? '\vsrc[/\\]test[/\\]java'
+            let l:test_dir = fnamemodify(l:src_dir, ':h:h:h')
+            \   . (has('win32') ? '\test\java\' : '/test/java/')
+
+            if isdirectory(l:test_dir)
+                call add(l:sp_dirs, l:test_dir)
+            endif
+        endif
+    endif
+
+    if !empty(l:sp_dirs)
+        let l:sp_option = '-sourcepath '
+        \   . ale#Escape(join(l:sp_dirs, s:classpath_sep))
     endif
 
     " Create .class files in a temporary directory, which we will delete later.

test/command_callback/test_javac_command_callback.vader

@@ -116,7 +116,7 @@ Execute(The javac callback should combine discovered classpaths and manual ones)
 
 Execute(The javac callback should detect source directories):
   call ale#engine#Cleanup(bufnr(''))
-  :e! java_paths/src/main/java/com/something/dummy
+  noautocmd e! java_paths/src/main/java/com/something/dummy
   call ale#engine#InitBufferInfo(bufnr(''))
 
   AssertEqual
@@ -155,3 +155,33 @@ Execute(The javac callback should use g:ale_java_javac_options correctly):
   \ g:prefix
   \   . ' -d TEMP --anything --else %t',
   \ GetCommand([])
+
+Execute(The javac callback should include src/test/java for test paths):
+  call ale#engine#Cleanup(bufnr(''))
+  " The test path is only included for test files.
+  " Regular Java files shouldn't import from tests.
+  noautocmd e! java_paths/src/test/java/com/something/dummy
+  call ale#engine#InitBufferInfo(bufnr(''))
+
+  AssertEqual
+  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && javac -Xlint'
+  \   . ' -sourcepath ' . ale#Escape(join([
+  \     ale#path#Winify(g:dir . '/java_paths/src/main/java/'),
+  \     ale#path#Winify(g:dir . '/java_paths/src/test/java/'),
+  \   ], g:cp_sep))
+  \   . ' -d TEMP %t',
+  \ GetCommand([])
+
+Execute(The javac callback should include src/main/jaxb when available):
+  call ale#engine#Cleanup(bufnr(''))
+  noautocmd e! java_paths_with_jaxb/src/main/java/com/something/dummy
+  call ale#engine#InitBufferInfo(bufnr(''))
+
+  AssertEqual
+  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && javac -Xlint'
+  \   . ' -sourcepath ' . ale#Escape(join([
+  \     ale#path#Winify(g:dir . '/java_paths_with_jaxb/src/main/java/'),
+  \     ale#path#Winify(g:dir . '/java_paths_with_jaxb/src/main/jaxb/'),
+  \   ], g:cp_sep))
+  \   . ' -d TEMP %t',
+  \ GetCommand([])