test(lua): add java lua layer

lua/spacevim/layer/lang/java.lua

@@ -0,0 +1,37 @@
+--=============================================================================
+-- java.lua --- Java layer
+-- Copyright (c) 2016-2019 Wang Shidong & Contributors
+-- Author: Wang Shidong < wsdjeg@outlook.com >
+-- URL: https://spacevim.org
+-- License: GPLv3
+--=============================================================================
+
+local M = {}
+
+local format_on_save = true
+
+
+function M.plugins()
+    
+end
+
+
+function M.config()
+    
+end
+
+
+function M.set_variable(var)
+    format_on_save = var.format_on_save or format_on_save
+
+end
+
+
+function M.get_variable()
+    return {
+        'format_on_save' = format_on_save
+    }
+end
+
+
+return M

test/lua/layer/lang/java.vader

@@ -0,0 +1,7 @@
+Execute ( SpaceVim lua layer: lang#java ):
+  if has('nvim-0.5.0') || has('+lua')
+    lua require('spacevim.layer.lang.java').set_variable({['format_on_save'] = false})
+    lua format_on_save = require('spacevim.layer.lang.java').get_variable()
+    AssertEqual cmp.luaeval('format_on_save'), v:false
+  endif
+