Add initial tests

tests/cases/conformance/jsdoc/callbackTag1.ts

@@ -0,0 +1,12 @@
+// @noEmit: true
+// @allowJs: true
+// @checkJs: true
+// @Filename: cb.js
+
+/** @callback Sid
+ * @param {string} s
+ * @returns {string} What were you expecting
+ */
+
+/** @type {Sid} smallId */
+var sid = s => s + "!";

tests/cases/fourslash/server/jsdocCallbackTag.ts

@@ -0,0 +1,31 @@
+/// <reference path="../fourslash.ts"/>
+
+// @allowNonTsExtensions: true
+// @Filename: jsdocCallbackTag.js
+
+//// /**
+////  * @callback FooHandler
+////  * @param {string} eventName - So many words
+////  * @param eventName2 {number | string} - Silence is golden
+////  * @param eventName3 - Osterreich mos def
+////  */
+//// /**
+////  * @type {FooHandler} callback
+////  */
+//// var t/*1*/;
+////
+//// /**
+////  * @callback FooHandler2 - What, another one?
+////  * @param {string=} eventName - it keeps happening
+////  * @param {string} [eventName2] - i WARNED you dog
+////  */
+//// /**
+////  * @type {FooHandler2} callback
+////  */
+//// var t2/*2*/;
+
+
+goTo.marker("1");
+verify.quickInfoIs("var t: (eventName: string, eventName2: number | string, eventName3: any) => void");
+goTo.marker("2");
+verify.quickInfoIs("var t2: (eventName?: string, eventName2?: string) => void"); 

tests/cases/fourslash/server/jsdocCallbackTagNavigateTo.ts

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+/// <reference path="../fourslash.ts"/>
+
+// @allowNonTsExtensions: true
+// @Filename: jsDocCallback.js
+
+//// /**
+////  * @callback FooCallback
+////  * @param {string} eventName - What even is the navigation bar?
+////  */
+//// /** @type {FooCallback} */
+//// var t;
+
+verify.navigationBar([
+    {
+        "text": "<global>",
+        "kind": "module",
+        "childItems": [
+            {
+                "text": "FooCallback",
+                "kind": "type"
+            },
+            {
+                "text": "t",
+                "kind": "var"
+            }
+        ]
+    },
+    {
+        "text": "FooCallback",
+        "kind": "type",
+        "indent": 1
+    }
+])

tests/cases/fourslash/server/jsdocCallbackTagRename01.ts

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+/// <reference path="../fourslash.ts"/>
+
+// @allowNonTsExtensions: true
+// @Filename: jsDocCallback.js
+////
+//// /**
+////  * @callback [|FooCallback|]
+////  * @param {string} eventName - Rename should work
+////  */
+////
+//// /** @type {/*1*/[|FooCallback|]} */
+//// var t;
+
+const ranges = test.ranges();
+verify.renameLocations(ranges[0], { findInStrings: false, findInComments: true, ranges });