No template refactor on plain strings (microsoft#36785)

* Add/convert to failing tests.

* Stop offering to convert single string literals to template expressions.

* Ensure we're actually testing for single quotes.

Author: DanielRosenwasser

src/services/refactors/convertStringOrTemplateLiteral.ts

@@ -11,7 +11,7 @@ namespace ts.refactor.convertStringOrTemplateLiteral {
         const maybeBinary = getParentBinaryExpression(node);
         const refactorInfo: ApplicableRefactorInfo = { name: refactorName, description: refactorDescription, actions: [] };
 
-        if ((isBinaryExpression(maybeBinary) || isStringLiteral(maybeBinary)) && isStringConcatenationValid(maybeBinary)) {
+        if (isBinaryExpression(maybeBinary) && isStringConcatenationValid(maybeBinary)) {
             refactorInfo.actions.push({ name: refactorName, description: refactorDescription });
             return [refactorInfo];
         }

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_OnModuleSpecifier.ts

@@ -0,0 +1,6 @@
+/// <reference path='fourslash.ts' />
+
+////import { x } from /*x*/"foo"/*y*/;
+
+goTo.select("x", "y");
+verify.not.refactorAvailable(ts.Diagnostics.Convert_to_template_string.message);

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_ToTemplateBackTick.ts

@@ -3,10 +3,4 @@
 //// const foo = "/*x*/w/*y*/ith back`tick"
 
 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 = `with back\\`tick`",
-});
+verify.not.refactorAvailable(ts.Diagnostics.Convert_to_template_string.message);

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\``,
+});

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_ToTemplateSimple.ts

@@ -3,10 +3,4 @@
 //// const foo = "/*x*/f/*y*/oobar rocks"
 
 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 rocks\``,
-});
+verify.not.refactorAvailable(ts.Diagnostics.Convert_to_template_string.message);

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_ToTemplateSingleQuote.ts

@@ -3,10 +3,4 @@
 //// const foo = '/*x*/f/*y*/oobar rocks'
 
 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 rocks\``,
-});
+verify.not.refactorAvailable(ts.Diagnostics.Convert_to_template_string.message);