diff --git a/jest.config.ts b/jest.config.ts
index 2a31b155..509616a2 100644
--- a/jest.config.ts
+++ b/jest.config.ts
@@ -90,7 +90,7 @@ const config: Config = {
     reporters: ["default"],
 
     // Automatically reset mock state between every test
-    // resetMocks: false,
+    resetMocks: true,
 
     // Reset the module registry before running each individual test
     // resetModules: false,
@@ -99,7 +99,7 @@ const config: Config = {
     // resolver: undefined,
 
     // Automatically restore mock state between every test
-    // restoreMocks: false,
+    restoreMocks: true,
 
     // The root directory that Jest should scan for tests and modules within
     rootDir: "./",
diff --git a/src/commands/rustup.ts b/src/commands/rustup.ts
index 0dc1ffdb..51ba663e 100644
--- a/src/commands/rustup.ts
+++ b/src/commands/rustup.ts
@@ -55,7 +55,6 @@ export class RustUp {
         switch (process.platform) {
             case "darwin":
             case "linux": {
-            // eslint-disable-line prettier/prettier
                 const rustupSh = await tc.downloadTool("https://sh.rustup.rs");
 
                 // While the `rustup-init.sh` is properly executed as is,
diff --git a/src/tests/commands/cargo.test.ts b/src/tests/commands/cargo.test.ts
index 56f31330..89d44e30 100644
--- a/src/tests/commands/cargo.test.ts
+++ b/src/tests/commands/cargo.test.ts
@@ -11,10 +11,6 @@ jest.mock("@actions/exec");
 jest.mock("@actions/cache");
 
 describe("cargo", () => {
-    beforeEach(() => {
-        jest.resetAllMocks();
-    });
-
     it("Cargo", async () => {
         const spy = jest.spyOn(io, "which").mockResolvedValue("/home/user/.cargo/bin/cargo");
 
diff --git a/src/tests/commands/crates.test.ts b/src/tests/commands/crates.test.ts
index f9b532a9..33945a91 100644
--- a/src/tests/commands/crates.test.ts
+++ b/src/tests/commands/crates.test.ts
@@ -8,10 +8,6 @@ import { type CratesIO } from "schema";
 jest.mock("@actions/http-client");
 
 describe("resolveVersion", () => {
-    beforeEach(() => {
-        jest.resetAllMocks();
-    });
-
     it("resolves", async () => {
         const version = "1.0.107";
 
diff --git a/src/tests/commands/cross.test.ts b/src/tests/commands/cross.test.ts
index d425b67b..49211c68 100644
--- a/src/tests/commands/cross.test.ts
+++ b/src/tests/commands/cross.test.ts
@@ -6,10 +6,6 @@ import { Cross } from "core";
 jest.mock("@actions/exec");
 
 describe("cross", () => {
-    beforeEach(() => {
-        jest.resetAllMocks();
-    });
-
     it("Cross", async () => {
         const spy = jest.spyOn(io, "which").mockResolvedValue("/home/user/.cargo/bin/cross");
 
diff --git a/src/tests/commands/rustup.test.ts b/src/tests/commands/rustup.test.ts
index 33117614..f91ec747 100644
--- a/src/tests/commands/rustup.test.ts
+++ b/src/tests/commands/rustup.test.ts
@@ -5,8 +5,18 @@ import { RustUp } from "core";
 jest.mock("@actions/io");
 
 describe("rustup", () => {
+    const originalPlatform = process.platform;
+
     beforeEach(() => {
-        jest.resetAllMocks();
+        Object.defineProperty(process, "platform", {
+            value: "linux",
+        });
+    });
+
+    afterEach(function () {
+        Object.defineProperty(process, "platform", {
+            value: originalPlatform,
+        });
     });
 
     it("get", async () => {
@@ -16,4 +26,56 @@ describe("rustup", () => {
 
         expect(spy).toHaveBeenCalledTimes(1);
     });
+
+    // it("getOrInstall", async () => {
+    //     const spy = jest.spyOn(io, "which").mockResolvedValue("/home/user/.cargo/bin/rustup");
+
+    //     await expect(RustUp.getOrInstall()).resolves.toEqual({ path: "/home/user/.cargo/bin/rustup" });
+
+    //     expect(spy).toHaveBeenCalledTimes(1);
+    // });
+
+    it("getOrInstall install", async () => {
+        // prepare instance to return after installation
+        const prepared = jest.spyOn(io, "which").mockResolvedValueOnce("/home/user/.cargo/bin/rustup");
+        const rustup = await RustUp.get();
+        prepared.mockClear();
+
+        // actual test
+        const spy1 = jest.spyOn(io, "which").mockRejectedValue(new Error("Could not find path to rustup"));
+        const spy2 = jest.spyOn(RustUp, "install").mockResolvedValue(rustup);
+
+        await expect(RustUp.getOrInstall()).resolves.toEqual({ path: "/home/user/.cargo/bin/rustup" });
+
+        expect(spy1).toHaveBeenCalledTimes(1);
+        expect(spy2).toHaveBeenCalledTimes(1);
+    });
+
+    it("install", async () => {
+        Object.defineProperty(process, "platform", {
+            value: "sunos",
+        });
+
+        expect.assertions(1);
+
+        // await expect(RustUp.install()).rejects.toThrow(/Unknown platform/);
+        try {
+            const r = await RustUp.install();
+
+            console.log(r);
+        } catch (error: unknown) {
+            expect((error as Error)?.message).toMatch(/Unknown platform/);
+        }
+    });
+
+    async function test(t: boolean): Promise<string> {
+        if (t) {
+            throw new Error("OMG WTF BBQ");
+        }
+        return await Promise.resolve("foo");
+    }
+
+    it("throws?", async () => {
+        await expect(test(true)).rejects.toThrowError(/OMG/);
+    });
 });