diff --git a/test/css/samples/empty-class/_config.js b/test/css/samples/empty-class/_config.js
index cf778c3401..e4953939ae 100644
--- a/test/css/samples/empty-class/_config.js
+++ b/test/css/samples/empty-class/_config.js
@@ -3,6 +3,7 @@ export default {
 
 	warnings: [{
 		filename: "SvelteComponent.html",
+		code: `css-unused-selector`,
 		message: "Unused CSS selector",
 		loc: {
 			line: 4,
diff --git a/test/css/samples/omit-scoping-attribute-descendant/_config.js b/test/css/samples/omit-scoping-attribute-descendant/_config.js
index 0d56c7ba8c..1bad4343aa 100644
--- a/test/css/samples/omit-scoping-attribute-descendant/_config.js
+++ b/test/css/samples/omit-scoping-attribute-descendant/_config.js
@@ -2,6 +2,7 @@ export default {
 	cascade: false,
 
 	warnings: [{
+		code: `css-unused-selector`,
 		message: 'Unused CSS selector',
 		loc: {
 			line: 8,
@@ -9,7 +10,7 @@ export default {
 		},
 		pos: 74,
 		frame: `
-			 6: 
+			 6:
 			 7: <style>
 			 8:   div > p {
 			      ^
diff --git a/test/css/samples/refs-qualified/_config.js b/test/css/samples/refs-qualified/_config.js
index 7a68dd30ec..b525fd8f58 100644
--- a/test/css/samples/refs-qualified/_config.js
+++ b/test/css/samples/refs-qualified/_config.js
@@ -6,6 +6,7 @@ export default {
 	},
 
 	warnings: [{
+		code: `css-unused-selector`,
 		message: 'Unused CSS selector',
 		loc: {
 			column: 1,
diff --git a/test/css/samples/refs/_config.js b/test/css/samples/refs/_config.js
index 995ae66b4e..3136799de0 100644
--- a/test/css/samples/refs/_config.js
+++ b/test/css/samples/refs/_config.js
@@ -2,6 +2,7 @@ export default {
 	cascade: false,
 
 	warnings: [{
+		code: `css-unused-selector`,
 		message: 'Unused CSS selector',
 		loc: {
 			column: 1,
diff --git a/test/css/samples/unused-selector-leading/_config.js b/test/css/samples/unused-selector-leading/_config.js
index a5ae65ffa2..fecc03e31d 100644
--- a/test/css/samples/unused-selector-leading/_config.js
+++ b/test/css/samples/unused-selector-leading/_config.js
@@ -4,6 +4,7 @@ export default {
 	warnings: [
 		{
 			filename: "SvelteComponent.html",
+			code: `css-unused-selector`,
 			message: "Unused CSS selector",
 			loc: {
 				line: 4,
@@ -21,6 +22,7 @@ export default {
 
 		{
 			filename: "SvelteComponent.html",
+			code: `css-unused-selector`,
 			message: "Unused CSS selector",
 			loc: {
 				line: 4,
diff --git a/test/css/samples/unused-selector-ternary/_config.js b/test/css/samples/unused-selector-ternary/_config.js
index 427e75a35d..7b1ce0c305 100644
--- a/test/css/samples/unused-selector-ternary/_config.js
+++ b/test/css/samples/unused-selector-ternary/_config.js
@@ -7,6 +7,7 @@ export default {
 
 	warnings: [{
 		filename: "SvelteComponent.html",
+		code: `css-unused-selector`,
 		message: "Unused CSS selector",
 		loc: {
 			line: 12,
diff --git a/test/css/samples/unused-selector/_config.js b/test/css/samples/unused-selector/_config.js
index 48504c996d..a86a2c2847 100644
--- a/test/css/samples/unused-selector/_config.js
+++ b/test/css/samples/unused-selector/_config.js
@@ -3,6 +3,7 @@ export default {
 
 	warnings: [{
 		filename: "SvelteComponent.html",
+		code: `css-unused-selector`,
 		message: "Unused CSS selector",
 		loc: {
 			line: 8,
@@ -11,7 +12,7 @@ export default {
 		pos: 60,
 		frame: `
 			 6:   }
-			 7: 
+			 7:
 			 8:   .bar {
 			      ^
 			 9:     color: blue;
diff --git a/test/formats/index.js b/test/formats/index.js
index dee4f2c1be..2a8b47df53 100644
--- a/test/formats/index.js
+++ b/test/formats/index.js
@@ -184,6 +184,7 @@ describe("formats", () => {
 			);
 
 			assert.deepEqual(warnings, [{
+				code: `options-missing-globals`,
 				message: `No name was supplied for imported module 'lodash'. Guessing '_', but you should use options.globals`
 			}]);
 		});