Ensure we're actually testing for single quotes.

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_ToTemplateBinaryExprSingleQuote.ts

@@ -0,0 +1,12 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = '/*x*/f/*y*/oobar is ' + (42 + 6) + ' years old'
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert to template string",
+    actionName: "Convert to template string",
+    actionDescription: ts.Diagnostics.Convert_to_template_string.message,
+    newContent:
+`const foo = \`foobar is \${42 + 6} years old\``,
+});