fix formatting, update tests

Author: David Buzinski

src/install.ts

@@ -109,7 +109,11 @@ export async function install(
             try {
                 await mpm.install(mpmPath, releaseInfo, products, destination);
             } catch (e) {
-                if (releaseInfo.isPrerelease && e instanceof Error && e.message === "Specified release is unavailable") {
+                if (
+                    releaseInfo.isPrerelease &&
+                    e instanceof Error &&
+                    e.message === "Specified release is unavailable"
+                ) {
                     core.info("Installation failed. Retrying...");
                     const grRelease: matlab.Release = {
                         ...releaseInfo,

src/install.unit.test.ts

@@ -336,9 +336,9 @@ describe("install procedure", () => {
             matlabGetReleaseInfoMock.mockResolvedValue(prereleaseInfo);
         });
 
-        it("retries with general release when prerelease install fails", async () => {
+        it("retries with general release when prerelease install fails with unavailable release", async () => {
             mpmInstallMock
-                .mockRejectedValueOnce(Error("Script exited with non-zero code 1"))
+                .mockRejectedValueOnce(Error("Specified release is unavailable"))
                 .mockResolvedValueOnce(undefined);
             matlabGetToolcacheDirMock
                 .mockResolvedValueOnce([
@@ -360,7 +360,7 @@ describe("install procedure", () => {
         });
 
         it("rejects when both prerelease and general release install fail", async () => {
-            mpmInstallMock.mockRejectedValue(Error("Script exited with non-zero code 1"));
+            mpmInstallMock.mockRejectedValue(Error("Specified release is unavailable"));
             matlabGetToolcacheDirMock
                 .mockResolvedValueOnce([
                     "/opt/hostedtoolcache/MATLAB/2026.1.999-prerelease/x64",
@@ -375,7 +375,18 @@ describe("install procedure", () => {
 
         it("does not retry for non-prerelease install failures", async () => {
             matlabGetReleaseInfoMock.mockResolvedValue(releaseInfo);
+            mpmInstallMock.mockRejectedValue(Error("Specified release is unavailable"));
+            await expect(doInstall()).rejects.toBeDefined();
+            expect(mpmInstallMock).toHaveBeenCalledTimes(1);
+        });
+
+        it("does not retry prerelease install for other errors", async () => {
             mpmInstallMock.mockRejectedValue(Error("Script exited with non-zero code 1"));
+            matlabGetToolcacheDirMock.mockResolvedValueOnce([
+                "/opt/hostedtoolcache/MATLAB/2026.1.999-prerelease/x64",
+                false,
+            ]);
+
             await expect(doInstall()).rejects.toBeDefined();
             expect(mpmInstallMock).toHaveBeenCalledTimes(1);
         });

src/mpm.unit.test.ts

@@ -213,6 +213,23 @@ describe("mpm install", () => {
         expect(rmRFMock).toHaveBeenCalledWith(destination);
     });
 
+    it("rejects with specific message when output includes specified release is unavailable", async () => {
+        const destination = "/opt/matlab";
+        const products = ["MATLAB", "Compiler"];
+
+        execMock.mockImplementation((cmd: string, args?: string[], options?: ExecOptions) => {
+            if (options && options.listeners && typeof options.listeners.stderr === "function") {
+                options.listeners.stderr(Buffer.from("Error: Specified release is unavailable."));
+            }
+            return Promise.resolve(1);
+        });
+
+        await expect(mpm.install(mpmPath, releaseInfo, products, destination)).rejects.toThrow(
+            "Specified release is unavailable",
+        );
+        expect(rmRFMock).toHaveBeenCalledWith(destination);
+    });
+
     it("does not reject when mpm exits non-zero but reports already installed", async () => {
         const destination = "/opt/matlab";
         const products = ["MATLAB", "Compiler"];