add test cases

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_ToTemplateCalcExpr.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 string concatenation or template literal",
+    actionName: "Convert to template literal",
+    actionDescription: "Convert to template literal",
+    newContent: 
+`const foo = \`foobar is \${ 42 + 6 } years old\``,
+});

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_ToTemplateMultiExpr.ts

@@ -0,0 +1,16 @@
+/// <reference path='fourslash.ts' />
+
+//// const age = 22
+//// const name = "Eddy"
+//// const foo = /*x*/n/*y*/ame + " is " + age + " years old"
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert string concatenation or template literal",
+    actionName: "Convert to template literal",
+    actionDescription: "Convert to template literal",
+    newContent: 
+`const age = 22
+const name = "Eddy"
+const foo = \`\${ name } is \${ age } years old\``,
+});

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_ToTemplateOneExpr.ts

@@ -0,0 +1,14 @@
+/// <reference path='fourslash.ts' />
+
+//// const age = 42
+//// const foo = "/*x*/f/*y*/oobar is " + age + " years old"
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert string concatenation or template literal",
+    actionName: "Convert to template literal",
+    actionDescription: "Convert to template literal",
+    newContent: 
+`const age = 42
+const foo = \`foobar is \${ age } years old\``,
+});

tests/cases/fourslash/refactorConvertStringOrTemplateLiteral_ToTemplateSimple.ts

@@ -0,0 +1,12 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = "/*x*/f/*y*/oobar rocks"
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert string concatenation or template literal",
+    actionName: "Convert to template literal",
+    actionDescription: "Convert to template literal",
+    newContent: 
+`const foo = \`foobar rocks\``,
+});