tests: Test all `awful.placement.stretch` aliases

tests/examples/awful/placement/stretch_down.lua

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+-- Stretch the drawable to the bottom of the parent area. --DOC_HEADER
+-- @tparam drawable d A drawable (like `client` or `wibox`) --DOC_HEADER
+-- @tparam[opt={}] table args Other arguments --DOC_HEADER
+-- @name stretch_down --DOC_HEADER
+-- @class function --DOC_HEADER
+
+screen[1]._resize {width = 128, height = 96} --DOC_HIDE
+local placement = require("awful.placement") --DOC_HIDE
+
+local c = client.gen_fake {x = 45, y = 35, width=40, height=30} --DOC_HIDE
+placement.stretch_down(client.focus)
+
+assert(c.x==45) --DOC_HIDE
+assert(c.y==35) --DOC_HIDE
+assert(c.width == 40) --DOC_HIDE
+assert(c.y+c.height == --DOC_HIDE
+    screen[1].geometry.y + screen[1].geometry.height) --DOC_HIDE

tests/examples/awful/placement/stretch_left.lua

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+-- Stretch the drawable to the left of the parent area. --DOC_HEADER
+-- @tparam drawable d A drawable (like `client` or `wibox`) --DOC_HEADER
+-- @tparam[opt={}] table args Other arguments --DOC_HEADER
+-- @name stretch_left --DOC_HEADER
+-- @class function --DOC_HEADER
+
+screen[1]._resize {width = 128, height = 96} --DOC_HIDE
+local placement = require("awful.placement") --DOC_HIDE
+
+local c = client.gen_fake {x = 45, y = 35, width=40, height=30} --DOC_HIDE
+placement.stretch_left(client.focus)
+
+assert(c.x == c.border_width and c.y == 35 and c.height == 30 --DOC_HIDE
+    and c.width == 45+40) --DOC_HIDE

tests/examples/awful/placement/stretch_right.lua

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+-- Stretch the drawable to the right of the parent area. --DOC_HEADER
+-- @tparam drawable d A drawable (like `client` or `wibox`) --DOC_HEADER
+-- @tparam[opt={}] table args Other arguments --DOC_HEADER
+-- @name stretch_right --DOC_HEADER
+-- @class function --DOC_HEADER
+
+screen[1]._resize {width = 128, height = 96} --DOC_HIDE
+local placement = require("awful.placement") --DOC_HIDE
+
+local c = client.gen_fake {x = 45, y = 35, width=40, height=30} --DOC_HIDE
+placement.stretch_right(client.focus)
+
+local right = screen[1].geometry.x + screen[1].geometry.width --DOC_HIDE
+assert(c.height == 30 and c.x == 45 and c.x+c.width+c.border_width == right) --DOC_HIDE

tests/examples/awful/placement/stretch_up.lua

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+-- Stretch the drawable to the top of the parent area. --DOC_HEADER
+-- @tparam drawable d A drawable (like `client` or `wibox`) --DOC_HEADER
+-- @tparam[opt={}] table args Other arguments --DOC_HEADER
+-- @name stretch_up --DOC_HEADER
+-- @class function --DOC_HEADER
+
+screen[1]._resize {width = 128, height = 96} --DOC_HIDE
+local placement = require("awful.placement") --DOC_HIDE
+
+local c = client.gen_fake {x = 45, y = 35, width=40, height=30} --DOC_HIDE
+placement.stretch_up(client.focus)
+
+assert(c.y==c.border_width) --DOC_HIDE
+assert(c.x==45) --DOC_HIDE
+assert(c.width == 40) --DOC_HIDE
+print(c.height)
+assert(c.height == 35+30) --DOC_HIDE