tests: validator: add support for customElement compile option + test cases (#4133)

test/validator/index.js

@@ -27,7 +27,8 @@ describe("validate", () => {
 				const { warnings } = svelte.compile(input, {
 					dev: config.dev,
 					legacy: config.legacy,
-					generate: false
+					generate: false,
+					customElement: config.customElement
 				});
 
 				assert.deepEqual(warnings.map(w => ({

test/validator/samples/tag-custom-element-options-missing/input.svelte

@@ -0,0 +1 @@
+<svelte:options tag="custom-element"/>

test/validator/samples/tag-custom-element-options-missing/warnings.json

@@ -0,0 +1,15 @@
+[{
+		"code": "missing-custom-element-compile-options",
+		"message": "The 'tag' option is used when generating a custom element. Did you forget the 'customElement: true' compile option?",
+		"start": {
+				"line": 1,
+				"column": 16,
+				"character": 16
+		},
+		"end": {
+				"line": 1,
+				"column": 36,
+				"character": 36
+		},
+		"pos": 16
+}]

test/validator/samples/tag-custom-element-options-true/_config.js

@@ -0,0 +1,3 @@
+export default {
+	customElement: true
+};

test/validator/samples/tag-custom-element-options-true/input.svelte

@@ -0,0 +1 @@
+<svelte:options tag="custom-element"/>