diff --git a/tests/unit-tests/order-items/order-item-coupon.php b/tests/unit-tests/order-items/order-item-coupon.php
new file mode 100644
index 00000000000..04c5d22cc92
--- /dev/null
+++ b/tests/unit-tests/order-items/order-item-coupon.php
@@ -0,0 +1,29 @@
+<?php
+
+/**
+ * Order Item Coupon Tests.
+ * @package WooCommerce\Tests\Order_Items
+ * @since 3.2.0
+ */
+class WC_Tests_Order_Item_Coupon extends WC_Unit_Test_Case {
+
+	/**
+	 * Test the setter and getter methods.
+	 *
+	 * @since 3.2.0
+	 */
+	public function test_setters_getters() {
+		$coupon = new WC_Order_Item_Coupon;
+
+		$coupon->set_name( 'testcoupon' );
+		$this->assertTrue( 'testcoupon' === $coupon->get_name() && $coupon->get_name() === $coupon->get_code() );
+		$coupon->set_code( 'testcoupon2' );
+		$this->assertTrue( 'testcoupon2' === $coupon->get_name() && $coupon->get_name() === $coupon->get_code() );
+
+		$coupon->set_discount( '5.00' );
+		$this->assertEquals( '5.00', $coupon->get_discount() );
+
+		$coupon->set_discount_tax( '0.50' );
+		$this->assertEquals( '0.50', $coupon->get_discount_tax() );
+	}
+}
diff --git a/tests/unit-tests/order-items/order-item-fee.php b/tests/unit-tests/order-items/order-item-fee.php
new file mode 100644
index 00000000000..a39b337dcc8
--- /dev/null
+++ b/tests/unit-tests/order-items/order-item-fee.php
@@ -0,0 +1,103 @@
+<?php
+
+/**
+ * Order Item Fee Tests.
+ * @package WooCommerce\Tests\Order_Items
+ * @since 3.2.0
+ */
+class WC_Tests_Order_Item_Fee extends WC_Unit_Test_Case {
+
+	/**
+	 * Test WC_Order_Item_Fee setters and getters.
+	 *
+	 * @since 3.2.0
+	 */
+	public function test_setters_getters() {
+		$fee = new WC_Order_Item_Fee;
+
+		$fee->set_amount( '20.00' );
+		$this->assertEquals( '20.00', $fee->get_amount() );
+
+		$fee->set_tax_class( 'reduced-rate' );
+		$this->assertEquals( 'reduced-rate', $fee->get_tax_class() );
+
+		$fee->set_total( '15.01' );
+		$this->assertEquals( '15.01', $fee->get_total() );
+
+		$fee->set_total_tax( '5.01' );
+		$this->assertEquals( '5.01', $fee->get_total_tax() );
+
+		$taxes = array(
+			'total' => array( '10', '2.4' ),
+		);
+		$fee->set_taxes( $taxes );
+		$this->assertEquals( $taxes, $fee->get_taxes() );
+		$this->assertEquals( '12.4', $fee->get_total_tax() );
+	}
+
+	/**
+	 * Test calculate_taxes method of WC_Order_Item_Fee.
+	 *
+	 * @since 3.2.0
+	 */
+	public function test_calculate_taxes() {
+		global $wpdb;
+		update_option( 'woocommerce_calc_taxes', 'yes' );
+		$tax_rate = array(
+			'tax_rate_country'  => '',
+			'tax_rate_state'    => '',
+			'tax_rate'          => '10.0000',
+			'tax_rate_name'     => 'TAX',
+			'tax_rate_priority' => '1',
+			'tax_rate_compound' => '0',
+			'tax_rate_shipping' => '0',
+			'tax_rate_order'    => '1',
+			'tax_rate_class'    => '',
+		);
+		WC_Tax::_insert_tax_rate( $tax_rate );
+		$order = WC_Helper_Order::create_order();
+
+		// Positive fee.
+		$fee = new WC_Order_Item_Fee;
+		$fee->set_amount( '5.00' );
+		$fee->set_total( '5.00' );
+		$fee->set_order_id( $order->get_id() );
+
+		$fee->calculate_taxes( array(
+			'country' => 'US',
+			'state' => 'OR',
+			'postcode' => 97266,
+			'city' => 'Portland',
+		) );
+
+		$taxes = $fee->get_taxes();
+		$total_taxes = array_values( $taxes['total'] );
+		$expected = array( '0.5' );
+		$this->assertEquals( $expected, $total_taxes );
+		$this->assertEquals( '0.5', $fee->get_total_tax() );
+
+		// Negative fee.
+		$fee = new WC_Order_Item_Fee;
+		$fee->set_amount( '-5.00' );
+		$fee->set_total( '-5.00' );
+		$fee->set_order_id( $order->get_id() );
+
+		$fee->calculate_taxes( array(
+			'country' => 'US',
+			'state' => 'OR',
+			'postcode' => 97266,
+			'city' => 'Portland',
+		) );
+
+		$taxes = $fee->get_taxes();
+		$total_taxes = array_values( $taxes['total'] );
+		$expected = array( '-0.5' );
+		$this->assertEquals( $expected, $total_taxes );
+		$this->assertEquals( '-0.5', $fee->get_total_tax() );
+
+		// Clean up.
+		WC_Helper_Order::delete_order( $order->get_id() );
+		$wpdb->query( "DELETE FROM {$wpdb->prefix}woocommerce_tax_rates" );
+		$wpdb->query( "DELETE FROM {$wpdb->prefix}woocommerce_tax_rate_locations" );
+	}
+}
diff --git a/tests/unit-tests/order-items/order-item-meta.php b/tests/unit-tests/order-items/order-item-meta.php
index f0992a2a6af..6c67ef97a85 100644
--- a/tests/unit-tests/order-items/order-item-meta.php
+++ b/tests/unit-tests/order-items/order-item-meta.php
@@ -43,4 +43,57 @@ class WC_Tests_Order_Item_Meta extends WC_Unit_Test_Case {
 		// Clean up.
 		$item->delete( true );
 	}
+
+	/**
+	 * Test the get_formatted method of WC_Order_Item_Meta.
+	 *
+	 * @since 3.2.0
+	 */
+	public function test_get_formatted() {
+		wp_insert_term( 'Testing Categories', 'category', array( 'slug' => 'testing' ) );
+
+		$item = new WC_Order_Item_Fee();
+		$item->add_meta_data( 'regularkey', '1' );
+		$item->add_meta_data( 'category', 'testing' );
+		$item->add_meta_data( '_hiddenkey', '3' );
+		$item->save();
+
+		$meta = new WC_Order_Item_Meta( $item );
+
+		$expected = array( 'regularkey' => '1', 'category' => 'Testing Categories' );
+		$actual = wp_list_pluck( $meta->get_formatted(), 'value', 'key' );
+		$this->assertEquals( $expected, $actual );
+
+		// Clean up.
+		$item->delete( true );
+	}
+
+
+	/**
+	 * Test the display method of WC_Order_Item_Meta.
+	 *
+	 * @since 3.2.0
+	 */
+	public function test_display() {
+		$item = new WC_Order_Item_Fee();
+		$item->add_meta_data( 'regularkey', '1' );
+		$item->add_meta_data( 'category', 'testing' );
+		$item->add_meta_data( '_hiddenkey', '3' );
+		$item->save();
+
+		$meta = new WC_Order_Item_Meta( $item );
+
+		$expected = "regularkey: 1, \ncategory: Testing Categories";
+		$flat = $meta->display( true, true );
+		$this->assertEquals( $expected, $flat );
+
+		$not_flat = $meta->display( false, true );
+		$this->assertContains( 'class="variation-regularkey">regularkey:', $not_flat );
+		$this->assertContains( 'class="variation-regularkey"><p>1</p>', $not_flat );
+		$this->assertContains( 'class="variation-category">category:', $not_flat );
+		$this->assertContains( 'class="variation-category"><p>Testing Categories</p>', $not_flat );
+
+		// Clean up.
+		$item->delete( true );
+	}
 }
diff --git a/tests/unit-tests/order-items/order-item-product.php b/tests/unit-tests/order-items/order-item-product.php
new file mode 100644
index 00000000000..c3627bf4a00
--- /dev/null
+++ b/tests/unit-tests/order-items/order-item-product.php
@@ -0,0 +1,130 @@
+<?php
+
+/**
+ * Order Item Product Tests.
+ * @package WooCommerce\Tests\Order_Items
+ * @since 3.2.0
+ */
+class WC_Tests_Order_Item_Product extends WC_Unit_Test_Case {
+
+	/**
+	 * Test generic setters and getters for WC_Order_Item_Product.
+	 *
+	 * @since 3.2.0
+	 */
+	public function test_generic_setters_getters() {
+		$simple_product = new WC_Product_Simple;
+		$simple_product->save();
+
+		$variation_product = new WC_Product_Variation;
+		$variation_product->save();
+
+		$product_item = new WC_Order_Item_Product;
+
+		$product_item->set_quantity( 3 );
+		$this->assertEquals( 3, $product_item->get_quantity() );
+
+		$product_item->set_tax_class( 'reduced-rate' );
+		$this->assertEquals( 'reduced-rate', $product_item->get_tax_class() );
+
+		$product_item->set_product_id( $simple_product->get_id() );
+		$this->assertEquals( $simple_product->get_id(), $product_item->get_product_id() );
+
+		$product_item->set_variation_id( $variation_product->get_id() );
+		$this->assertEquals( $variation_product->get_id(), $product_item->get_variation_id() );
+
+		$product_item->set_subtotal( '12.00' );
+		$this->assertEquals( '12.00', $product_item->get_subtotal() );
+
+		$product_item->set_total( '10.00' );
+		$this->assertEquals( '10.00', $product_item->get_total() );
+
+		$product_item->set_subtotal_tax( '0.50' );
+		$this->assertEquals( '0.50', $product_item->get_subtotal_tax() );
+
+		$product_item->set_total_tax( '0.30' );
+		$this->assertEquals( '0.30', $product_item->get_total_tax() );
+	}
+
+	/**
+	 * Test set_taxes and get_taxes for WC_Order_Item_Product.
+	 *
+	 * @since 3.2.0
+	 */
+	public function test_set_get_taxes() {
+		$product_item = new WC_Order_Item_Product;
+
+		$taxes = array(
+			'total'    => array( '10', '2.4' ),
+			'subtotal' => array( '12', '3.1' ),
+		);
+		$product_item->set_taxes( $taxes );
+		$this->assertEquals( $taxes, $product_item->get_taxes() );
+		$this->assertEquals( '12.4', $product_item->get_total_tax() );
+		$this->assertEquals( '15.1', $product_item->get_subtotal_tax() );
+	}
+
+	/**
+	 * Test set_product and get_product for WC_Order_Item_Product.
+	 *
+	 * @since 3.2.0
+	 */
+	public function test_set_get_product() {
+		$simple_product = new WC_Product_Simple;
+		$simple_product->set_name( 'Test Simple' );
+		$simple_product->set_tax_class( 'reduced-rate' );
+		$simple_product->save();
+
+		$parent_product = new WC_Product_Variable;
+		$parent_product->set_name( 'Test Parent' );
+		$parent_product->save();
+
+		$variation_product = new WC_Product_Variation;
+		$variation_product->set_name( 'Test Variation' );
+		$variation_product->set_parent_id( $parent_product->get_id() );
+		$variation_product->save();
+
+		// Simple product.
+		$product_item = new WC_Order_Item_Product;
+		$product_item->set_product( $simple_product );
+		$this->assertEquals( 'Test Simple', $product_item->get_name() );
+		$this->assertEquals( $simple_product->get_id(), $product_item->get_product_id() );
+		$this->assertEquals( 0, $product_item->get_variation_id() );
+		$this->assertEquals( 'reduced-rate', $product_item->get_tax_class() );
+
+		$retrieved = $product_item->get_product();
+		$this->assertEquals( $simple_product->get_id(), $retrieved->get_id() );
+
+		// Variation product.
+		$product_item = new WC_Order_Item_Product;
+		$product_item->set_product( $variation_product );
+		$this->assertEquals( 'Test Parent', $product_item->get_name() );
+		$this->assertEquals( $parent_product->get_id(), $product_item->get_product_id() );
+		$this->assertEquals( $variation_product->get_id(), $product_item->get_variation_id() );
+		$this->assertEquals( '', $product_item->get_tax_class() );
+
+		$retrieved = $product_item->get_product();
+		$this->assertEquals( $variation_product->get_id(), $retrieved->get_id() );
+	}
+
+	/**
+	 * Test get_item_download_url method for WC_Order_Item_Product.
+	 *
+	 * @since 3.2.0
+	 */
+	public function test_get_item_download_url() {
+		$product = new WC_Product_Simple;
+		$product->save();
+
+		$order = new WC_Order;
+		$order->set_billing_email( 'test@woocommerce.com' );
+		$order->save();
+
+		$product_item = new WC_Order_Item_Product;
+		$product_item->set_product( $product );
+		$product_item->set_order_id( $order->get_id() );
+
+		$expected_regex = '/download_file=.*&order=wc_order_.*&email=test%40woocommerce.com&key=100/';
+		$this->assertRegexp( $expected_regex, $product_item->get_item_download_url( 100 ) );
+	}
+}