add tests for ToAnon, ToArrow and available arrow

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_Availability_Arrow.ts

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+/// <reference path='fourslash.ts' />
+
+//// /*z*/c/*y*/onst /*x*/f/*w*/oo = /*v*/(/*u*//*t*/a/*s*/, b) /*r*/=/*q*/> /*p*/4/*o*/2;
+
+goTo.select("z", "y");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to named function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to anonymous function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to arrow function");
+
+goTo.select("x", "w");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to named function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to anonymous function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to arrow function");
+
+goTo.select("v", "u");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to named function");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to anonymous function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to arrow function");
+
+goTo.select("t", "s");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to named function");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to anonymous function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to arrow function");
+
+goTo.select("r", "q");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to named function");
+verify.refactorAvailable("Convert arrow function or function expression", "Convert to anonymous function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to arrow function");
+
+goTo.select("p", "o");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to named function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to anonymous function");
+verify.not.refactorAvailable("Convert arrow function or function expression", "Convert to arrow function");

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToAnon_Comment.ts

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+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/a/*y*/ => {
+////    // secret word
+////    return a + 1;
+////    /*
+////    hidden msg
+////    */
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to anonymous function",
+    actionDescription: "Convert to anonymous function",
+    newContent: `const foo = function(a) {
+    // secret word
+    return a + 1;
+    /*
+    hidden msg
+    */
+};`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToAnon_MultiLine.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/a/*y*/ => {
+////    let b = 1;
+////    return a + b;
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to anonymous function",
+    actionDescription: "Convert to anonymous function",
+    newContent: `const foo = function(a) {
+    let b = 1;
+    return a + b;
+};`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToAnon_MultiParam.ts

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+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/(/*y*/a,b,c) => a + 1;
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to anonymous function",
+    actionDescription: "Convert to anonymous function",
+    newContent: `const foo = function(a, b, c) {
+    return a + 1;
+};`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToAnon_SingleLine.ts

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+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/(/*y*/) => 1 + 1;
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to anonymous function",
+    actionDescription: "Convert to anonymous function",
+    newContent: `const foo = function() {
+    return 1 + 1;
+};`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_MultiLine.ts

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+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/f/*y*/unction() {
+////    let a = 41;
+////    return a + 1;
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `const foo = () => {
+    let a = 41;
+    return a + 1;
+};`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_MultiLine_Comment.ts

@@ -0,0 +1,25 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/f/*y*/unction() {
+////    // secret
+////    let a = 41;
+////    /*
+////    msg
+////    */
+////    return a + 1;
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `const foo = () => {
+    // secret
+    let a = 41;
+    /*
+    msg
+    */
+    return a + 1;
+};`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_Param.ts

@@ -0,0 +1,13 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/f/*y*/unction(a, b, c) {
+////    return a + b + c;
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `const foo = (a, b, c) => a + b + c;`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_Single_Assign.ts

@@ -0,0 +1,15 @@
+/// <reference path='fourslash.ts' />
+
+//// let bar;
+//// const foo = /*x*/f/*y*/unction() {
+////    bar = 42;
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `let bar;
+const foo = () => bar = 42;`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_Single_Decl.ts

@@ -0,0 +1,15 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/f/*y*/unction() {
+////    let bar;
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `const foo = () => {
+    let bar;
+};`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_Single_FnCall.ts

@@ -0,0 +1,15 @@
+/// <reference path='fourslash.ts' />
+
+//// function s(){}
+//// const foo = /*x*/f/*y*/unction() {
+////    s();
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `function s(){}
+const foo = () => s();`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_Single_For.ts

@@ -0,0 +1,15 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/f/*y*/unction() {
+////    for (let i = 0; i < 5; i++) { }
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `const foo = () => {
+    for (let i = 0; i < 5; i++) { }
+};`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_Single_If.ts

@@ -0,0 +1,15 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/f/*y*/unction() {
+////    if (true) { }
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `const foo = () => {
+    if (true) { }
+};`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_Single_Return.ts

@@ -0,0 +1,13 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/f/*y*/unction() {
+////    return 42;
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `const foo = () => 42;`,
+});

tests/cases/fourslash/refactorConvertArrowFunctionOrFunctionExpression_ToArrow_Single_While.ts

@@ -0,0 +1,15 @@
+/// <reference path='fourslash.ts' />
+
+//// const foo = /*x*/f/*y*/unction() {
+////    while (true) { }
+//// };
+
+goTo.select("x", "y");
+edit.applyRefactor({
+    refactorName: "Convert arrow function or function expression",
+    actionName: "Convert to arrow function",
+    actionDescription: "Convert to arrow function",
+    newContent: `const foo = () => {
+    while (true) { }
+};`,
+});