get_theme_mods() vs get_theme_mod()

gistfile1.txt

	// wp-content/themes/twentyfifteen/inc.customizer.php
	
	$wp_customize->add_setting( 'test-color', array(
			'default' => '#f72525',
			'sanitize_callback' => 'sanitize_hex_color',
	) );
	
	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'test-color', array(
			'label' => __( 'Test Color', 'twentyfifteen' ),
			'section' => 'colors',
	) ) );
	
// wp-content/themes/twentyfifteen/header.php
$theme_mods = get_theme_mods();
echo "<pre>";
var_dump($theme_mods);
echo "test-color: ". get_theme_mod('test-color');