diff --git a/test/test_error.rb b/test/test_error.rb
index ed817da..7e6fc34 100644
--- a/test/test_error.rb
+++ b/test/test_error.rb
@@ -2,7 +2,7 @@ require_relative "minitest_helper"
 require "voicemeeter"
 
 class CAPIErrorTest < Minitest::Test
-  def test_it_raises_an_unknown_parameter_error
+  def test_it_raises_a_capierror_on_unknown_parameter
     e = assert_raises(Voicemeeter::Errors::VMCAPIError) { Test.vm.set("Unknown.Parameter", 1) }
     assert_equal(e.fn_name, "VBVMR_SetParameterFloat")
     assert_equal(e.code, -3)
@@ -10,15 +10,27 @@ class CAPIErrorTest < Minitest::Test
 end
 
 class InvalidKindTest < MiniTest::Test
-  def test_it_raises_an_invalid_kind_error
+  def test_it_raises_a_vmerror_on_invalid_kind
     e = assert_raises(Voicemeeter::Errors::VMError) { Voicemeeter::Remote.new("unknown_kind") }
-    assert_equal(e.message, "unknown Voicemeeter kind 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
+  def test_it_raises_a_vmerror_on_unknown_config_name
     e = assert_raises(Voicemeeter::Errors::VMError) { Test.vm.apply_config(:unknown) }
-    assert_equal(e.message, "unknown config unknown. known configs: #{Test.vm.configs.keys}")
+    assert_equal(e.message, "unknown config 'unknown'. known configs: #{Test.vm.configs.keys}")
+  end
+end
+
+class UnknownConfigKey < MiniTest::Test
+  def test_it_raises_a_keyerror_on_unknown_config_key
+    config = {
+      "strip-0" => {mute: true, gain: 3.2, A1: true},
+      "unknown-0" => {stateonly: true},
+      "vban-out-3" => {on: true, bit: 24}
+    }
+    e = assert_raises(KeyError) { Test.vm.apply(config) }
+    assert_equal(e.message, "invalid config key 'unknown'")
   end
 end