diff --git a/test/error_test.rb b/test/error_test.rb
index 09e84c1..f6c29ad 100644
--- a/test/error_test.rb
+++ b/test/error_test.rb
@@ -4,18 +4,21 @@ require_relative "../lib/voicemeeter"
 class CAPIErrorTest < Minitest::Test
   def test_it_raises_an_unknown_parameter_error
     e = assert_raises(Voicemeeter::Errors::VMCAPIError) { Test.vm.set("Unknown.Parameter", 1) }
+    assert_equal(e.fn_name, "VBVMR_SetParameterFloat")
     assert_equal(e.code, -3)
   end
 end
 
 class InvalidKindTest < MiniTest::Test
   def test_it_raises_an_invalid_kind_error
-    assert_raises(Voicemeeter::Errors::VMError) { Voicemeeter::Remote.new("unknown_kind") }
+    e = assert_raises(Voicemeeter::Errors::VMError) { Voicemeeter::Remote.new("unknown_kind") }
+    assert_equal(e.message, "unknown Voicemeeter kind unknown_kind")
   end
 end
 
 class UnknownConfigTest < MiniTest::Test
   def test_it_raises_an_unknown_config_error
-    assert_raises(Voicemeeter::Errors::VMError) { Test.vm.apply_config(:unknown) }
+    e = assert_raises(Voicemeeter::Errors::VMError) { Test.vm.apply_config(:unknown) }
+    assert_equal(e.message, "unknown config unknown. known configs: #{Test.vm.configs.keys}")
   end
 end