You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: config_test.go
    path of file: ./repos/hugo/output
    
    the code of the file until where you have to start completion: // Copyright 2024 The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
    
func TestDecodeConfig(t *testing.T) {
	c := qt.New(t)

	mediaTypes := media.Types{media.Builtin.JSONType, media.Builtin.XMLType}

	tests := []struct {
		name        string
		m           map[string]any
		shouldError bool
		assert      func(t *testing.T, name string, f Formats)
	}{
		{
			"Redefine JSON",
			map[string]any{
				"json": map[string]any{
					"baseName":    "myindex",
					"isPlainText": "false",
				},
			},
			false,
			func(t *testing.T, name string, f Formats) {
				msg := qt.Commentf(name)
				c.Assert(len(f), qt.Equals, len(DefaultFormats), msg)
				json, _ := f.GetByName("JSON")
				c.Assert(json.BaseName, qt.Equals, "myindex")
				c.Assert(json.MediaType, qt.Equals, media.Builtin.JSONType)
				c.Assert(json.IsPlainText, qt.Equals, false)
			},
		},
		{
			"Add XML format with string as mediatype",
			map[string]any{
				"MYXMLFORMAT": map[string]any{
					"baseName":  "myxml",
					"mediaType": "application/xml",
				},
			},
			false,
			func(t *testing.T, name string, f Formats) {
				c.Assert(len(f), qt.Equals, len(DefaultFormats)+1)
				xml, found := f.GetByName("MYXMLFORMAT")
				c.Assert(found, qt.Equals, true)
				c.Assert(xml.BaseName, qt.Equals, "myxml")
				c.Assert(xml.MediaType, qt.Equals, media.Builtin.XMLType)

				// Verify that we haven't changed the DefaultFormats slice.
				json, _ := f.GetByName("JSON")
				c.Assert(json.BaseName, qt.Equals, "index")
			},
		},
		{
			"Add format unknown mediatype",
			map[string]any{
				"MYINVALID": map[string]any{
					"baseName":  "mymy",
					"mediaType": "application/hugo",
				},
			},
			true,
			func(t *testing.T, name string, f Formats) {
			},
		},
	}

	for _, test := range tests {
		result, err := DecodeConfig(mediaTypes, test.m)
		msg := qt.Commentf(test.name)

		if test.shouldError {
			c.Assert(err, qt.Not(qt.IsNil), msg)
		} else {
			c.Assert(err, qt.IsNil, msg)
			test.assert(t, test.name, result.Config)
		}
	}
}