Merge pull request #2249 from Aire-One/fix_widget_slider_doc

Fix widget slider doc

lib/wibox/widget/slider.lua

@@ -114,6 +114,8 @@ local slider = {mt={}}
 
 --- The slider value.
 --
+-- **Signal:** *property::value* notify the value is changed.
+--
 --@DOC_wibox_widget_slider_value_EXAMPLE@
 --
 -- @property value

spec/wibox/widget/slider_spec.lua

@@ -0,0 +1,44 @@
+---------------------------------------------------------------------------
+-- @author Aire-One
+-- @copyright 2018 Aire-One
+---------------------------------------------------------------------------
+
+local slider = require("wibox.widget.slider")
+
+describe("wibox.widget.slider", function()
+    local widget = nil
+
+    before_each(function()
+        widget = slider()
+    end)
+
+    describe("signal property::value", function()
+        local property_value = nil
+        before_each(function()
+            widget:connect_signal("property::value", function()
+                property_value = property_value + 1
+            end)
+
+            property_value = 0
+        end)
+
+        it("signal property::value", function()
+            -- initial stats
+            assert.is.equal(property_value, 0)
+            assert.is.equal(widget.value, 0)
+
+            -- test to direct change the value
+            -- it should call the automated "property changed" signal
+            widget.value = 50
+            assert.is.equal(property_value, 1)
+            assert.is.equal(widget.value, 50)
+
+            -- test with the setter
+            widget:set_value(100)
+            assert.is.equal(property_value, 2)
+            assert.is.equal(widget.value, 100)
+        end)
+    end)
+end)
+
+-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80