diff --git a/extensions/typescript-language-features/src/test/functionCallSnippet.test.ts b/extensions/typescript-language-features/src/test/functionCallSnippet.test.ts
index f5da5c7ca19..215a2a3b428 100644
--- a/extensions/typescript-language-features/src/test/functionCallSnippet.test.ts
+++ b/extensions/typescript-language-features/src/test/functionCallSnippet.test.ts
@@ -44,4 +44,22 @@ suite('typescript function call snippets', () => {
 			).value,
 			'bla()$0');
 	});
+
+	test('Should extract parameter from display parts', async () => {
+		assert.strictEqual(
+			snippetForFunctionCall(
+				{ label: 'activate' },
+				[{ "text": "function", "kind": "keyword" }, { "text": " ", "kind": "space" }, { "text": "activate", "kind": "text" }, { "text": "(", "kind": "punctuation" }, { "text": "context", "kind": "parameterName" }, { "text": ":", "kind": "punctuation" }, { "text": " ", "kind": "space" }, { "text": "vscode", "kind": "aliasName" }, { "text": ".", "kind": "punctuation" }, { "text": "ExtensionContext", "kind": "interfaceName" }, { "text": ")", "kind": "punctuation" }, { "text": ":", "kind": "punctuation" }, { "text": " ", "kind": "space" }, { "text": "void", "kind": "keyword" }]
+			).value,
+			'activate(${1:context})$0');
+	});
+
+	test('Should extract all parameters from display parts', async () => {
+		assert.strictEqual(
+			snippetForFunctionCall(
+				{ label: 'foo' },
+				[{ "text": "function", "kind": "keyword" }, { "text": " ", "kind": "space" }, { "text": "foo", "kind": "functionName" }, { "text": "(", "kind": "punctuation" }, { "text": "a", "kind": "parameterName" }, { "text": ":", "kind": "punctuation" }, { "text": " ", "kind": "space" }, { "text": "string", "kind": "keyword" }, { "text": ",", "kind": "punctuation" }, { "text": " ", "kind": "space" }, { "text": "b", "kind": "parameterName" }, { "text": ":", "kind": "punctuation" }, { "text": " ", "kind": "space" }, { "text": "number", "kind": "keyword" }, { "text": ",", "kind": "punctuation" }, { "text": " ", "kind": "space" }, { "text": "c", "kind": "parameterName" }, { "text": ":", "kind": "punctuation" }, { "text": " ", "kind": "space" }, { "text": "boolean", "kind": "keyword" }, { "text": ")", "kind": "punctuation" }, { "text": ":", "kind": "punctuation" }, { "text": " ", "kind": "space" }, { "text": "void", "kind": "keyword" }]
+			).value,
+			'foo(${1:a}, ${2:b}, ${3:c})$0');
+	});
 });