add fourslash tests for codefix

Author: sandersn

tests/cases/fourslash/codeFixPropertyOverrideAccess.ts

@@ -0,0 +1,27 @@
+/// <reference path='fourslash.ts' />
+
+// @strict: true
+
+//// class A {
+////     get x() { return 1 }
+//// }
+//// class B extends A {
+////     x = 2
+//// }
+
+verify.codeFix({
+    description: `Generate 'get' and 'set' accessors`,
+    newFileContent: `class A {
+    get x() { return 1 }
+}
+class B extends A {
+    private _x = 2
+    public get x() {
+        return this._x
+    }
+    public set x(value) {
+        this._x = value
+    }
+}`,
+    index: 0
+})

tests/cases/fourslash/codeFixPropertyOverrideAccess2.ts

@@ -0,0 +1,27 @@
+/// <reference path='fourslash.ts' />
+
+// @strict: true
+
+//// class A {
+////     x = 1
+//// }
+//// class B extends A {
+////     get x() { return 2 }
+//// }
+
+verify.codeFix({
+    description: `Generate 'get' and 'set' accessors`,
+    newFileContent: `class A {
+    private _x = 1
+    public get x() {
+        return this._x
+    }
+    public set x(value) {
+        this._x = value
+    }
+}
+class B extends A {
+    get x() { return 2 }
+}`,
+    index: 0
+})