Add registry tests.

Author: CyrusNajmabadi

tests/cases/unittests/services/documentRegistry.ts

@@ -35,4 +35,40 @@ describe("DocumentRegistry", () => {
 
         assert(f3 === f4, "Changed module: Expected to have the same instance of the document");
     });
+
+    it("Acquiring document gets correct version 1", () => {
+        var documentRegistry = ts.createDocumentRegistry();
+        var defaultCompilerOptions = ts.getDefaultCompilerOptions();
+
+        // Simulate one LS getting the document.
+        var f1 = documentRegistry.acquireDocument("file1.ts", defaultCompilerOptions, ts.ScriptSnapshot.fromString("var x = 1;"), /* version */ "1");
+
+        // Simulate another LS getting the document at another version.
+        var f2 = documentRegistry.acquireDocument("file1.ts", defaultCompilerOptions, ts.ScriptSnapshot.fromString("var x = 1;"), /* version */ "2");
+
+        assert(f2.version === "2");
+    });
+
+    it("Acquiring document gets correct version 2", () => {
+        debugger;
+        var documentRegistry = ts.createDocumentRegistry();
+        var defaultCompilerOptions = ts.getDefaultCompilerOptions();
+
+        var contents = "var x = 1;"
+        var snapshot = ts.ScriptSnapshot.fromString(contents);
+
+        // Simulate one LS getting the document.
+        var f1 = documentRegistry.acquireDocument("file1.ts", defaultCompilerOptions, snapshot, /* version */ "1");
+
+        // Simulate another LS getting that document.
+        var f2 = documentRegistry.acquireDocument("file1.ts", defaultCompilerOptions, snapshot, /* version */ "1");
+
+        // Now LS1 updates their document.
+        var f3 = documentRegistry.updateDocument(f1, "file1.ts", defaultCompilerOptions, snapshot, /* version */ "2",
+            ts.createTextChangeRange(ts.createTextSpan(0, contents.length), contents.length));
+
+        // Now LS2 tries to update their document.  
+        var f4 = documentRegistry.updateDocument(f1, "file1.ts", defaultCompilerOptions, snapshot, /* version */ "3",
+            ts.createTextChangeRange(ts.createTextSpan(0, contents.length), contents.length));
+    });
 });