Implement ale.queue for calling ale#Queue in Lua

test/lua/ale_queue_spec.lua

@@ -0,0 +1,40 @@
+local eq = assert.are.same
+local ale = require("ale")
+
+describe("ale.queue", function()
+    local queue_calls
+
+    setup(function()
+        _G.vim = {
+            fn = {
+                ["ale#Queue"] = function(...)
+                    table.insert(queue_calls, {...})
+                end,
+            },
+        }
+    end)
+
+    teardown(function()
+        _G.vim = nil
+    end)
+
+    before_each(function()
+        queue_calls = {}
+    end)
+
+    it("should call ale#Queue with the right arguments", function()
+        ale.queue(0)
+        ale.queue(0, "")
+        ale.queue(123, "lint_file")
+        ale.queue(0, "", 42)
+        ale.queue(123, "lint_file", 42)
+
+        eq({
+            {0, nil, nil},
+            {0, "", nil},
+            {123, "lint_file", nil},
+            {0, "", 42},
+            {123, "lint_file", 42},
+        }, queue_calls)
+    end)
+end)