Add a test for awful.util.spawn_with_line_callback

Signed-off-by: Uli Schlachter <psychon@znc.in>

tests/test-spawn.lua

@@ -0,0 +1,45 @@
+--- Tests for spawn
+
+local util = require("awful.util")
+
+local spawns_done = 0
+
+local steps = {
+  function(count)
+    if count == 1 then
+      local steps_yay = 0
+      util.spawn_with_line_callback("echo yay", function(line)
+        assert(line == "yay", "line == '" .. tostring(line) .. "'")
+        assert(steps_yay == 0)
+        steps_yay = steps_yay + 1
+      end, nil, function()
+        assert(steps_yay == 1)
+        steps_yay = steps_yay + 1
+        spawns_done = spawns_done + 1
+      end)
+
+      local steps_count = 0
+      local err_count = 0
+      util.spawn_with_line_callback({ "sh", "-c", "printf line1\\\\nline2\\\\nline3 ; echo err >&2" },
+      function(line)
+        assert(steps_count < 3)
+        steps_count = steps_count + 1
+        assert(line == "line" .. steps_count, "line == '" .. tostring(line) .. "'")
+      end, function(line)
+        assert(err_count == 0)
+        err_count = err_count + 1
+        assert(line == "err", "line == '" .. tostring(line) .. "'")
+      end, function()
+        assert(steps_count == 3)
+        assert(err_count == 1)
+        steps_count = steps_count + 1
+        spawns_done = spawns_done + 1
+      end)
+    end
+    if spawns_done == 2 then
+      return true
+    end
+  end,
+}
+
+require("_runner").run_steps(steps)