Add test for #30457

Author: sheetalkamat

src/testRunner/unittests/tsc/incremental.ts

@@ -2,7 +2,7 @@ namespace ts {
     describe("unittests:: tsc:: incremental::", () => {
         verifyTscIncrementalEdits({
             scenario: "incremental",
-            subScenario: "when passing passing filename for buildinfo on commandline",
+            subScenario: "when passing filename for buildinfo on commandline",
             fs: () => loadProjectFromFiles({
                 "/src/project/src/main.ts": "export const x = 10;",
                 "/src/project/tsconfig.json": utils.dedent`
@@ -22,5 +22,21 @@ namespace ts {
                 modifyFs: noop,
             }]
         });
+
+        verifyTsc({
+            scenario: "incremental",
+            subScenario: "when passing rootDir from commandline",
+            fs: () => loadProjectFromFiles({
+                "/src/project/src/main.ts": "export const x = 10;",
+                "/src/project/tsconfig.json": utils.dedent`
+                    {
+                        "compilerOptions": {
+                            "incremental": true,
+                            "outDir": "dist",
+                        },
+                    }`,
+            }),
+            commandLineArgs: ["--p", "src/project", "--rootDir", "src/project/src"],
+        });
     });
 }

tests/baselines/reference/tsc/incremental/incremental-declaration-doesnt-change/when-passing-passing-filename-for-buildinfo-on-commandline.js renamed to tests/baselines/reference/tsc/incremental/incremental-declaration-doesnt-change/when-passing-filename-for-buildinfo-on-commandline.js

@@ -0,0 +1,41 @@
+//// [/lib/initial-buildOutput.txt]
+/lib/tsc --p src/project --rootDir src/project/src
+exitCode:: 0
+
+
+//// [/src/project/dist/main.js]
+"use strict";
+exports.__esModule = true;
+exports.x = 10;
+
+
+//// [/src/project/tsconfig.tsbuildinfo]
+{
+  "program": {
+    "fileInfos": {
+      "../../lib/lib.d.ts": {
+        "version": "3858781397-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }\ninterface ReadonlyArray<T> {}\ndeclare const console: { log(msg: any): void; };",
+        "signature": "3858781397-/// <reference no-default-lib=\"true\"/>\ninterface Boolean {}\ninterface Function {}\ninterface CallableFunction {}\ninterface NewableFunction {}\ninterface IArguments {}\ninterface Number { toExponential: any; }\ninterface Object {}\ninterface RegExp {}\ninterface String { charAt: any; }\ninterface Array<T> { length: number; [n: number]: T; }\ninterface ReadonlyArray<T> {}\ndeclare const console: { log(msg: any): void; };"
+      },
+      "./src/main.ts": {
+        "version": "-10726455937-export const x = 10;",
+        "signature": "-6057683066-export declare const x = 10;\r\n"
+      }
+    },
+    "options": {
+      "incremental": true,
+      "outDir": "./dist",
+      "project": "./",
+      "rootDir": "./src",
+      "configFilePath": "./tsconfig.json"
+    },
+    "referencedMap": {},
+    "exportedModulesMap": {},
+    "semanticDiagnosticsPerFile": [
+      "../../lib/lib.d.ts",
+      "./src/main.ts"
+    ]
+  },
+  "version": "FakeTSVersion"
+}
+