Add test for microsoft#35011

When searching for a default configured project, stop at
`node_modules`.

Author: amcasey

src/testRunner/tsconfig.json

@@ -101,6 +101,7 @@
         "unittests/services/extract/ranges.ts",
         "unittests/services/hostNewLineSupport.ts",
         "unittests/services/languageService.ts",
+        "unittests/services/projectService.ts",
         "unittests/services/organizeImports.ts",
         "unittests/services/patternMatcher.ts",
         "unittests/services/preProcessFile.ts",

src/testRunner/unittests/services/projectService.ts

@@ -0,0 +1,33 @@
+namespace ts {
+    describe("unittests:: services:: projectService", () => {
+        it("does not return default configured projects for node_modules", () => {
+            const rootFilePath = server.asNormalizedPath("/project/index.ts");
+            const rootProjectPath = server.asNormalizedPath("/project/tsconfig.json");
+            const nodeModulesFilePath1 = server.asNormalizedPath("/project/node_modules/@types/a/index.d.ts");
+            const nodeModulesProjectPath1 = server.asNormalizedPath("/project/node_modules/@types/a/tsconfig.json");
+            const nodeModulesFilePath2 = server.asNormalizedPath("/project/node_modules/@types/b/index.d.ts");
+            const serverHost = projectSystem.createServerHost([
+                { path: rootFilePath, content: "import 'a'; import 'b';" },
+                { path: rootProjectPath, content: "{}" },
+                { path: nodeModulesFilePath1, content: "{}" },
+                { path: nodeModulesProjectPath1, content: "{}" },
+                { path: nodeModulesFilePath2, content: "{}" },
+            ]);
+            const projectService = projectSystem.createProjectService(serverHost, { useSingleInferredProject: true });
+
+            const openRootFileResult = projectService.openClientFile(rootFilePath);
+            assert.strictEqual(openRootFileResult.configFileName?.toString(), rootProjectPath);
+
+            const openNodeModulesFileResult1 = projectService.openClientFile(nodeModulesFilePath1);
+            assert.strictEqual(openNodeModulesFileResult1.configFileName?.toString(), nodeModulesProjectPath1);
+
+            const openNodeModulesFileResult2 = projectService.openClientFile(nodeModulesFilePath2);
+            assert.isUndefined(openNodeModulesFileResult2.configFileName);
+
+            const rootProject = projectService.findProject(rootProjectPath)!;
+            assert.isTrue(rootProject.containsFile(rootFilePath));
+            assert.isTrue(rootProject.containsFile(nodeModulesFilePath1));
+            assert.isTrue(rootProject.containsFile(nodeModulesFilePath2));
+        });
+    });
+}