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: credential_test.go
    path of file: ./repos/mediamtx/internal/conf
    
    the code of the file until where you have to start completion: package conf

import (
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestCredential(t *testing.T) {
	t.Run("MarshalJSON", func(t *testing.T) {
		cred := Credential("password")
		expectedJSON := []byte(`"password"`)
		actualJSON, err := cred.MarshalJSON()
		assert.NoError(t, err)
		assert.Equal(t, expectedJSON, actualJSON)
	})

	t.Run("UnmarshalJSON", func(t *testing.T) {
		expectedCred := Credential("password")
		jsonData := []byte(`"password"`)
		var actualCred Credential
		err := actualCred.UnmarshalJSON(jsonData)
		assert.NoError(t, err)
		assert.Equal(t, expectedCred, actualCred)
	})

	t.Run("UnmarshalEnv", func(t *testing.T) {
		cred := Credential("")
		err := cred.UnmarshalEnv("", "password")
		assert.NoError(t, err)
		assert.Equal(t, Credential("password"), cred)
	})

	t.Run("IsSha256", func(t *testing.T) {
		cred := Credential("")
		assert.False(t, cred.IsSha256())
		assert.False(t, cred.IsHashed())

		cred = "sha256:j1tsRqDEw9xvq/D7/9tMx6Jh/jMhk3UfjwIB2f1zgMo="
		assert.True(t, cred.IsSha256())
		assert.True(t, cred.IsHashed())

		cred = "argon2:$argon2id$v=19$m=65536,t=1," +
			"p=4$WXJGqwIB2qd+pRmxMOw9Dg$X4gvR0ZB2DtQoN8vOnJPR2SeFdUhH9TyVzfV98sfWeE"
		assert.False(t, cred.IsSha256())
		assert.True(t, cred.IsHashed())
	})

	t.Run("IsArgon2", func(t *testing.T) {
		cred := Credential("")
		assert.False(t, cred.IsArgon2())
		assert.False(t, cred.IsHashed())

		cred = "sha256:j1tsRqDEw9xvq/D7/9tMx6Jh/jMhk3UfjwIB2f1zgMo="
		assert.False(t, cred.IsArgon2())
		assert.True(t, cred.IsHashed())

		cred = "argon2:$argon2id$v=19$m=65536,t=1," +
			"p=4$WXJGqwIB2qd+pRmxMOw9Dg$X4gvR0ZB2DtQoN8vOnJPR2SeFdUhH9TyVzfV98sfWeE"
		assert.True(t, cred.IsArgon2())
		assert.True(t, cred.IsHashed())
	})

	t.Run("Check-plain", func(t *testing.T) {
		cred := Credential("password")
		assert.True(t,
    
func TestCredential(t *testing.T) {
	t.Run("MarshalJSON", func(t *testing.T) {
		cred := Credential("password")
		expectedJSON := []byte(`"password"`)
		actualJSON, err := cred.MarshalJSON()
		assert.NoError(t, err)
		assert.Equal(t, expectedJSON, actualJSON)
	})

	t.Run("UnmarshalJSON", func(t *testing.T) {
		expectedCred := Credential("password")
		jsonData := []byte(`"password"`)
		var actualCred Credential
		err := actualCred.UnmarshalJSON(jsonData)
		assert.NoError(t, err)
		assert.Equal(t, expectedCred, actualCred)
	})

	t.Run("UnmarshalEnv", func(t *testing.T) {
		cred := Credential("")
		err := cred.UnmarshalEnv("", "password")
		assert.NoError(t, err)
		assert.Equal(t, Credential("password"), cred)
	})

	t.Run("IsSha256", func(t *testing.T) {
		cred := Credential("")
		assert.False(t, cred.IsSha256())
		assert.False(t, cred.IsHashed())

		cred = "sha256:j1tsRqDEw9xvq/D7/9tMx6Jh/jMhk3UfjwIB2f1zgMo="
		assert.True(t, cred.IsSha256())
		assert.True(t, cred.IsHashed())

		cred = "argon2:$argon2id$v=19$m=65536,t=1," +
			"p=4$WXJGqwIB2qd+pRmxMOw9Dg$X4gvR0ZB2DtQoN8vOnJPR2SeFdUhH9TyVzfV98sfWeE"
		assert.False(t, cred.IsSha256())
		assert.True(t, cred.IsHashed())
	})

	t.Run("IsArgon2", func(t *testing.T) {
		cred := Credential("")
		assert.False(t, cred.IsArgon2())
		assert.False(t, cred.IsHashed())

		cred = "sha256:j1tsRqDEw9xvq/D7/9tMx6Jh/jMhk3UfjwIB2f1zgMo="
		assert.False(t, cred.IsArgon2())
		assert.True(t, cred.IsHashed())

		cred = "argon2:$argon2id$v=19$m=65536,t=1," +
			"p=4$WXJGqwIB2qd+pRmxMOw9Dg$X4gvR0ZB2DtQoN8vOnJPR2SeFdUhH9TyVzfV98sfWeE"
		assert.True(t, cred.IsArgon2())
		assert.True(t, cred.IsHashed())
	})

	t.Run("Check-plain", func(t *testing.T) {
		cred := Credential("password")
		assert.True(t, cred.Check("password"))
		assert.False(t, cred.Check("wrongpassword"))
	})

	t.Run("Check-sha256", func(t *testing.T) {
		cred := Credential("password")
		assert.True(t, cred.Check("password"))
		assert.False(t, cred.Check("wrongpassword"))
	})

	t.Run("Check-sha256", func(t *testing.T) {
		cred := Credential("sha256:rl3rgi4NcZkpAEcacZnQ2VuOfJ0FxAqCRaKB/SwdZoQ=")
		assert.True(t, cred.Check("testuser"))
		assert.False(t, cred.Check("notestuser"))
	})

	t.Run("Check-argon2", func(t *testing.T) {
		cred := Credential("argon2:$argon2id$v=19$m=4096,t=3," +
			"p=1$MTIzNDU2Nzg$Ux/LWeTgJQPyfMMJo1myR64+o8rALHoPmlE1i/TR+58")
		assert.True(t, cred.Check("testuser"))
		assert.False(t, cred.Check("notestuser"))
	})

	t.Run("validate", func(t *testing.T) {
		tests := []struct {
			name    string
			cred    Credential
			wantErr bool
		}{
			{
				name:    "Empty credential",
				cred:    Credential(""),
				wantErr: false,
			},
			{
				name:    "Valid plain credential",
				cred:    Credential("validPlain123"),
				wantErr: false,
			},
			{
				name:    "Invalid plain credential",
				cred:    Credential("invalid/Plain"),
				wantErr: true,
			},
			{
				name:    "Valid sha256 credential",
				cred:    Credential("sha256:validBase64EncodedHash=="),
				wantErr: false,
			},
			{
				name:    "Invalid sha256 credential",
				cred:    Credential("sha256:inval*idBase64"),
				wantErr: true,
			},
			{
				name: "Valid Argon2 credential",
				cred: Credential("argon2:$argon2id$v=19$m=4096," +
					"t=3,p=1$MTIzNDU2Nzg$zarsL19s86GzUWlAkvwt4gJBFuU/A9CVuCjNI4fksow"),
				wantErr: false,
			},
			{
				name:    "Invalid Argon2 credential",
				cred:    Credential("argon2:invalid"),
				wantErr: true,
			},
			{
				name: "Invalid Argon2 credential",
				// testing argon2d errors, because it's not supported
				cred: Credential("$argon2d$v=19$m=4096,t=3," +
					"p=1$MTIzNDU2Nzg$Xqyd4R7LzXvvAEHaVU12+Nzf5OkHoYcwIEIIYJUDpz0"),
				wantErr: true,
			},
		}

		for _, tt := range tests {
			t.Run(tt.name, func(t *testing.T) {
				err := tt.cred.validate()
				if tt.wantErr {
					assert.Error(t, err)
				} else {
					assert.NoError(t, err)
				}
			})
		}
	})
}