1 files changed, 13 insertions, 1 deletions
diff --git a/tests/core/async_spec.lua b/tests/core/async_spec.lua
index 42c1fe65..7d965e9b 100644
--- a/tests/core/async_spec.lua
+++ b/tests/core/async_spec.lua
@@ -1,5 +1,6 @@
 local assert = require "luassert"
 local spy = require "luassert.spy"
+local match = require "luassert.match"
 local a = require "nvim-lsp-installer.core.async"
 local process = require "nvim-lsp-installer.process"
 
@@ -15,7 +16,7 @@ describe("async", function()
             a.sleep(1000)
         end)
         local stop = timestamp()
-        local grace_ms = 5
+        local grace_ms = 25
         assert.is_true((stop - start) >= (1000 - grace_ms))
     end)
 
@@ -47,4 +48,15 @@ describe("async", function()
             assert.spy(james_bond).was_not.called()
         end)
     )
+
+    it(
+        "should reject if async function raises error",
+        async_test(function()
+            local ok, err = a.promisify(function()
+                error "something went wrong"
+            end)()
+            assert.is_false(ok)
+            assert.is_true(match.has_match "something went wrong$"(err))
+        end)
+    )
 end)