adds a test for defined mapstructure of field

Author: phawxby

utils/config/service_configuration_test.go

@@ -135,12 +135,31 @@ func TestErrorFormatting(t *testing.T) {
 }
 
 func TestDeepErrorFormatting(t *testing.T) {
-	cfg := DefaultDeepConfiguration()
-	err := cfg.Validate()
+	defaults := DefaultDeepConfiguration()
+	err := defaults.Validate()
 	require.Error(t, err)
 
 	errortest.AssertError(t, err, commonerrors.ErrInvalid)
 	assert.Contains(t, err.Error(), "invalid: structure failed validation: (TestConfigDeep->TestConfig->db) [DEEP_CONFIG_DUMMYCONFIG_DB] cannot be blank")
+
+	err = os.Setenv("TEST_DEEP_CONFIG_DUMMYCONFIG_DB", "a test db")
+	require.NoError(t, err)
+	err = os.Setenv("TEST_DEEP_CONFIG_DUMMYCONFIG_DUMMY_HOST", "a test host")
+	require.NoError(t, err)
+	err = os.Setenv("TEST_DEEP_CONFIG_DUMMYCONFIG_PASSWORD", "a test password")
+	require.NoError(t, err)
+	err = os.Setenv("TEST_DEEP_CONFIG_DUMMYCONFIG_USER", "a test user")
+	require.NoError(t, err)
+	err = os.Setenv("TEST_DEEP_CONFIG_DUMMY_CONFIG_DB", "a test user")
+	require.NoError(t, err)
+
+	t.Run("defined mapstructure", func(t *testing.T) {
+		configTest2 := &DeepConfig{}
+		err = LoadFromSystem("test", configTest2, defaults)
+
+		errortest.AssertError(t, err, commonerrors.ErrInvalid)
+		assert.Contains(t, err.Error(), "invalid: structure failed validation: (TestConfigDeep->TestConfig2->dummy_host) [TEST_DEEP_CONFIG_DUMMY_CONFIG_DUMMY_HOST] cannot be blank")
+	})
 }
 
 func TestServiceConfigurationLoad(t *testing.T) {