diff --git a/tests/unit-tests/cart/cart.php b/tests/unit-tests/cart/cart.php
index 2263282a4fb..cd5d22ca0be 100644
--- a/tests/unit-tests/cart/cart.php
+++ b/tests/unit-tests/cart/cart.php
@@ -172,6 +172,11 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 		update_option( 'woocommerce_calc_taxes', 'yes' );
 		update_option( 'woocommerce_tax_round_at_subtotal', 'yes' );
 
+		// Set an address so that shipping can be calculated.
+		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_us_country' ) );
+		add_filter( 'woocommerce_customer_get_shipping_state', array( $this, 'force_customer_us_state' ) );
+		add_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_us_postcode' ) );
+
 		$tax_rate    = array(
 			'tax_rate_country'  => '',
 			'tax_rate_state'    => '',
@@ -567,7 +572,8 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 		$full_coupon->set_amount( 100 );
 		$full_coupon->save();
 
-		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_gb_shipping' ) );
+		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_gb_country' ) );
+		add_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_gb_postcode' ) );
 		WC()->cart->add_to_cart( $product->get_id(), 1 );
 
 		// Test in store location with no coupon.
@@ -604,8 +610,11 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 		WC()->cart->remove_coupons();
 
 		WC()->cart->empty_cart();
-		remove_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_gb_shipping' ) );
-		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_us_shipping' ) );
+		remove_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_gb_country' ) );
+		remove_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_gb_postcode' ) );
+		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_us_country' ) );
+		add_filter( 'woocommerce_customer_get_shipping_state', array( $this, 'force_customer_us_state' ) );
+		add_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_us_postcode' ) );
 		WC()->cart->add_to_cart( $product->get_id(), 1 );
 
 		// Test out of store location with no coupon.
@@ -710,7 +719,8 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 		$full_coupon->set_amount( 100 );
 		$full_coupon->save();
 
-		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_gb_shipping' ) );
+		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_gb_country' ) );
+		add_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_gb_postcode' ) );
 		WC()->cart->add_to_cart( $product->get_id(), 1 );
 
 		// Test in store location with no coupon.
@@ -747,8 +757,11 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 		WC()->cart->remove_coupons();
 
 		WC()->cart->empty_cart();
-		remove_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_gb_shipping' ) );
-		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_us_shipping' ) );
+		remove_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_gb_country' ) );
+		remove_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_gb_postcode' ) );
+		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_us_country' ) );
+		add_filter( 'woocommerce_customer_get_shipping_state', array( $this, 'force_customer_us_state' ) );
+		add_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_us_postcode' ) );
 		WC()->cart->add_to_cart( $product->get_id(), 1 );
 
 		// Test out of store location with no coupon.
@@ -851,7 +864,9 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 		$full_coupon->set_amount( 100 );
 		$full_coupon->save();
 
-		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_us_shipping' ) );
+		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_us_country' ) );
+		add_filter( 'woocommerce_customer_get_shipping_state', array( $this, 'force_customer_us_state' ) );
+		add_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_us_postcode' ) );
 		WC()->cart->add_to_cart( $product->get_id(), 1 );
 
 		// Test out of store location with no coupon.
@@ -895,10 +910,21 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 	 * @param string $country Country code.
 	 * @return string
 	 */
-	public function force_customer_gb_shipping( $country ) {
+	public function force_customer_gb_country( $country ) {
 		return 'GB';
 	}
 
+	/**
+	 * Helper that can be hooked to a filter to force the customer's shipping postal code to be ANN NAA.
+	 *
+	 * @since 3.9.0
+	 * @param string $postcode Postal code..
+	 * @return string
+	 */
+	public function force_customer_gb_postcode( $postcode ) {
+		return 'ANN NAA';
+	}
+
 	/**
 	 * Helper that can be hooked to a filter to force the customer's shipping country to be US.
 	 *
@@ -906,10 +932,32 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 	 * @param string $country Country code.
 	 * @return string
 	 */
-	public function force_customer_us_shipping( $country ) {
+	public function force_customer_us_country( $country ) {
 		return 'US';
 	}
 
+	/**
+	 * Helper that can be hooked to a filter to force the customer's shipping state to be NY.
+	 *
+	 * @since 3.9.0
+	 * @param string $state State code.
+	 * @return string
+	 */
+	public function force_customer_us_state( $state ) {
+		return 'NY';
+	}
+
+	/**
+	 * Helper that can be hooked to a filter to force the customer's shipping postal code to be 12345.
+	 *
+	 * @since 3.9.0
+	 * @param string $postcode Postal code.
+	 * @return string
+	 */
+	public function force_customer_us_postcode( $postcode ) {
+		return '12345';
+	}
+
 	/**
 	 * Test a rounding issue on prices that are entered inclusive tax and shipping is used.
 	 * See: #17970.
@@ -932,6 +980,11 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 		update_option( 'woocommerce_prices_include_tax', 'yes' );
 		update_option( 'woocommerce_calc_taxes', 'yes' );
 
+		// Set an address so that shipping can be calculated.
+		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_us_country' ) );
+		add_filter( 'woocommerce_customer_get_shipping_state', array( $this, 'force_customer_us_state' ) );
+		add_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_us_postcode' ) );
+
 		// 19% tax.
 		$tax_rate = array(
 			'tax_rate_country'  => '',
@@ -1487,6 +1540,11 @@ class WC_Tests_Cart extends WC_Unit_Test_Case {
 		// Add product to cart.
 		WC()->cart->add_to_cart( $product->get_id(), 1 );
 
+		// Set an address so that shipping can be calculated.
+		add_filter( 'woocommerce_customer_get_shipping_country', array( $this, 'force_customer_us_country' ) );
+		add_filter( 'woocommerce_customer_get_shipping_state', array( $this, 'force_customer_us_state' ) );
+		add_filter( 'woocommerce_customer_get_shipping_postcode', array( $this, 'force_customer_us_postcode' ) );
+
 		// Set the flat_rate shipping method.
 		WC()->session->set( 'chosen_shipping_methods', array( 'flat_rate' ) );
 		WC()->cart->calculate_totals();
diff --git a/tests/unit-tests/coupon/coupon.php b/tests/unit-tests/coupon/coupon.php
index 75922d17e02..e5a2dda5ec4 100644
--- a/tests/unit-tests/coupon/coupon.php
+++ b/tests/unit-tests/coupon/coupon.php
@@ -1,4 +1,9 @@
 <?php
+/**
+ * Coupon tests.
+ *
+ * @package WooCommerce\Tests\Coupon
+ */
 
 /**
  * Class Coupon.
@@ -7,6 +12,21 @@
  */
 class WC_Tests_Coupon extends WC_Unit_Test_Case {
 
+	/**
+	 * Sets up the test class.
+	 */
+	public function setUp() {
+		parent::setUp();
+
+		// Set a valid address for the customer so shipping rates will calculate.
+		WC()->customer->set_shipping_country( 'US' );
+		WC()->customer->set_shipping_state( 'NY' );
+		WC()->customer->set_shipping_postcode( '12345' );
+	}
+
+	/**
+	 * Cleans up after the test class.
+	 */
 	public function tearDown() {
 		WC()->cart->empty_cart();
 		WC()->cart->remove_coupons();
@@ -53,7 +73,7 @@ class WC_Tests_Coupon extends WC_Unit_Test_Case {
 		$test_coupon = new WC_Coupon( (string) $coupon_2->get_id() );
 		$this->assertEquals( $coupon_2->get_id(), $test_coupon->get_id() );
 
-		// Test getting a coupon by coupon object
+		// Test getting a coupon by coupon object.
 		$test_coupon = new WC_Coupon( $coupon_1 );
 		$this->assertEquals( $test_coupon->get_id(), $coupon_1->get_id() );
 	}
@@ -65,13 +85,13 @@ class WC_Tests_Coupon extends WC_Unit_Test_Case {
 	 */
 	public function test_add_discount() {
 
-		// Create coupon
+		// Create coupon.
 		$coupon = WC_Helper_Coupon::create_coupon();
 
-		// Add coupon, test return statement
+		// Add coupon, test return statement.
 		$this->assertTrue( WC()->cart->add_discount( $coupon->get_code() ) );
 
-		// Test if total amount of coupons is 1
+		// Test if total amount of coupons is 1.
 		$this->assertEquals( 1, count( WC()->cart->get_applied_coupons() ) );
 	}
 
@@ -82,16 +102,16 @@ class WC_Tests_Coupon extends WC_Unit_Test_Case {
 	 */
 	public function test_add_discount_duplicate() {
 
-		// Create coupon
+		// Create coupon.
 		$coupon = WC_Helper_Coupon::create_coupon();
 
-		// Add coupon
+		// Add coupon.
 		$this->assertTrue( WC()->cart->add_discount( $coupon->get_code() ) );
 
-		// Add coupon again, test return statement
+		// Add coupon again, test return statement.
 		$this->assertFalse( WC()->cart->add_discount( $coupon->get_code() ) );
 
-		// Test if total amount of coupons is 1
+		// Test if total amount of coupons is 1.
 		$this->assertEquals( 1, count( WC()->cart->get_applied_coupons() ) );
 	}
 
@@ -102,30 +122,30 @@ class WC_Tests_Coupon extends WC_Unit_Test_Case {
 	 */
 	public function test_fixed_cart_discount() {
 
-		// Create product
+		// Create product.
 		$product = WC_Helper_Product::create_simple_product();
 		$product->set_regular_price( 10 );
 		$product->save();
 
-		// Create coupon
+		// Create coupon.
 		$coupon = WC_Helper_Coupon::create_coupon();
 		update_post_meta( $coupon->get_id(), 'discount_type', 'fixed_cart' );
 		update_post_meta( $coupon->get_id(), 'coupon_amount', '5' );
 
-		// Create a flat rate method
+		// Create a flat rate method.
 		WC_Helper_Shipping::create_simple_flat_rate();
 
-		// Add product to cart
+		// Add product to cart.
 		WC()->cart->add_to_cart( $product->get_id(), 1 );
 
-		// Add coupon
+		// Add coupon.
 		WC()->cart->add_discount( $coupon->get_code() );
 
-		// Set the flat_rate shipping method
+		// Set the flat_rate shipping method.
 		WC()->session->set( 'chosen_shipping_methods', array( 'flat_rate' ) );
 		WC()->cart->calculate_totals();
 
-		// Test if the cart total amount is equal 15
+		// Test if the cart total amount is equal 15.
 		$this->assertEquals( 15, WC()->cart->total );
 	}
 
@@ -136,33 +156,33 @@ class WC_Tests_Coupon extends WC_Unit_Test_Case {
 	 */
 	public function test_fixed_product_discount() {
 
-		// Create product
+		// Create product.
 		$product = WC_Helper_Product::create_simple_product();
 		$product->set_regular_price( 10 );
 		$product->save();
 
-		// Create coupon
+		// Create coupon.
 		$coupon = WC_Helper_Coupon::create_coupon();
 		update_post_meta( $coupon->get_id(), 'discount_type', 'fixed_product' );
 		update_post_meta( $coupon->get_id(), 'coupon_amount', '5' );
 
-		// Create a flat rate method - $10
+		// Create a flat rate method - $10.
 		WC_Helper_Shipping::create_simple_flat_rate();
 
-		// Add fee - $10
+		// Add fee - $10.
 		WC_Helper_Fee::add_cart_fee();
 
-		// Add product to cart
+		// Add product to cart.
 		WC()->cart->add_to_cart( $product->get_id(), 1 );
 
-		// Add coupon
+		// Add coupon.
 		WC()->cart->add_discount( $coupon->get_code() );
 
-		// Set the flat_rate shipping method
+		// Set the flat_rate shipping method.
 		WC()->session->set( 'chosen_shipping_methods', array( 'flat_rate' ) );
 		WC()->cart->calculate_totals();
 
-		// Test if the cart total amount is equal 25
+		// Test if the cart total amount is equal 25.
 		$this->assertEquals( 25, WC()->cart->total );
 	}
 
@@ -173,33 +193,33 @@ class WC_Tests_Coupon extends WC_Unit_Test_Case {
 	 */
 	public function test_percent_discount() {
 
-		// Create product
+		// Create product.
 		$product = WC_Helper_Product::create_simple_product();
 		$product->set_regular_price( 10 );
 		$product->save();
 
-		// Create coupon
+		// Create coupon.
 		$coupon = WC_Helper_Coupon::create_coupon();
 		update_post_meta( $coupon->get_id(), 'discount_type', 'percent' );
 		update_post_meta( $coupon->get_id(), 'coupon_amount', '5' );
 
-		// Create a flat rate method
+		// Create a flat rate method.
 		WC_Helper_Shipping::create_simple_flat_rate();
 
-		// Add fee
+		// Add fee.
 		WC_Helper_Fee::add_cart_fee();
 
-		// Add product to cart
+		// Add product to cart.
 		WC()->cart->add_to_cart( $product->get_id(), 1 );
 
-		// Add coupon
+		// Add coupon.
 		WC()->cart->add_discount( $coupon->get_code() );
 
-		// Set the flat_rate shipping method
+		// Set the flat_rate shipping method.
 		WC()->session->set( 'chosen_shipping_methods', array( 'flat_rate' ) );
 		WC()->cart->calculate_totals();
 
-		// Test if the cart total amount is equal 29.5
+		// Test if the cart total amount is equal 29.5.
 		$this->assertEquals( 29.5, WC()->cart->total );
 	}
 
@@ -229,12 +249,12 @@ class WC_Tests_Coupon extends WC_Unit_Test_Case {
 	 * Test an item limit for percent discounts.
 	 */
 	public function test_percent_discount_item_limit() {
-		// Create product
+		// Create product.
 		$product = WC_Helper_Product::create_simple_product();
 		update_post_meta( $product->get_id(), '_price', '10' );
 		update_post_meta( $product->get_id(), '_regular_price', '10' );
 
-		// Create coupon
+		// Create coupon.
 		$coupon = WC_Helper_Coupon::create_coupon(
 			'dummycoupon',
 			array(
@@ -258,16 +278,19 @@ class WC_Tests_Coupon extends WC_Unit_Test_Case {
 		$this->assertEquals( 19.5, WC()->cart->total );
 	}
 
+	/**
+	 * Test the coupon's item limit.
+	 */
 	public function test_custom_discount_item_limit() {
 		// Register custom discount type.
 		WC_Helper_Coupon::register_custom_type( __FUNCTION__ );
 
-		// Create product
+		// Create product.
 		$product = WC_Helper_Product::create_simple_product();
 		update_post_meta( $product->get_id(), '_price', '10' );
 		update_post_meta( $product->get_id(), '_regular_price', '10' );
 
-		// Create coupon
+		// Create coupon.
 		$coupon = WC_Helper_Coupon::create_coupon(
 			'dummycoupon',
 			array(
diff --git a/tests/unit-tests/totals/totals.php b/tests/unit-tests/totals/totals.php
index ec4ab27966b..effa835a1c9 100644
--- a/tests/unit-tests/totals/totals.php
+++ b/tests/unit-tests/totals/totals.php
@@ -30,6 +30,11 @@ class WC_Tests_Totals extends WC_Unit_Test_Case {
 	public function setUp() {
 		parent::setUp();
 
+		// Set a valid address for the customer so shipping rates will calculate.
+		WC()->customer->set_shipping_country( 'US' );
+		WC()->customer->set_shipping_state( 'NY' );
+		WC()->customer->set_shipping_postcode( '12345' );
+
 		$this->ids = array();
 
 		$tax_rate    = array(