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__tests__/actionUtils.test.ts

@@ -197,6 +197,14 @@ test("getCompressionLevel allows zero for no compression", () => {
     expect(actionUtils.getCompressionLevel("foo")).toBe(0);
 });
 
+test("getCompressionLevel returns undefined for negative values", () => {
+    const infoMock = jest.spyOn(core, "info");
+
+    testUtils.setInput("foo", "-3");
+    expect(actionUtils.getCompressionLevel("foo")).toBeUndefined();
+    expect(infoMock).not.toHaveBeenCalledWith(expect.stringContaining("compression-level"));
+});
+
 test("getCompressionLevel returns undefined and warns if input is too large", () => {
     const infoMock = jest.spyOn(core, "info");
     testUtils.setInput("foo", "11");
@@ -218,7 +226,7 @@ test("setCompressionLevel sets no-compression flag when zero", () => {
     expect(process.env["GZIP"]).toBe("-0");
 });
 
-    test("higher compression level produces smaller gzip output", () => {
+test("higher compression level produces smaller gzip output", () => {
     const data = Buffer.alloc(8 * 1024, "A");
 
     const level0 = zlib.gzipSync(data, { level: 0 });
@@ -226,7 +234,7 @@ test("setCompressionLevel sets no-compression flag when zero", () => {
 
     expect(level0.byteLength).toBeGreaterThan(level9.byteLength);
     expect(level0.byteLength - level9.byteLength).toBeGreaterThan(1000);
-    });
+});
 
 test("getInputAsInt throws if required and value missing", () => {
     expect(() =>

__tests__/save.test.ts

@@ -136,3 +136,54 @@ test("save with valid inputs uploads a cache", async () => {
 
     expect(failedMock).toHaveBeenCalledTimes(0);
 });
+
+test("negative compression level leaves env unset in combined flow", async () => {
+    const failedMock = jest.spyOn(core, "setFailed");
+    const setCompressionLevelMock = jest.spyOn(
+        actionUtils,
+        "setCompressionLevel"
+    );
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const savedCacheKey = "Linux-node-";
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        });
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Path, inputPath);
+    testUtils.setInput(Inputs.UploadChunkSize, "4000000");
+    testUtils.setInput(Inputs.CompressionLevel, "-5");
+
+    const cacheId = 4;
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(cacheId);
+        });
+
+    await saveRun();
+
+    expect(process.env["ZSTD_CLEVEL"]).toBeUndefined();
+    expect(process.env["GZIP"]).toBeUndefined();
+    expect(setCompressionLevelMock).not.toHaveBeenCalled();
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        {
+            uploadChunkSize: 4000000
+        },
+        false
+    );
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});

__tests__/saveImpl.test.ts

@@ -473,7 +473,10 @@ test("save applies compression level when provided", async () => {
 
 test("save skips setting compression when value is out of range", async () => {
     const failedMock = jest.spyOn(core, "setFailed");
-    const setCompressionLevelMock = jest.spyOn(actionUtils, "setCompressionLevel");
+    const setCompressionLevelMock = jest.spyOn(
+        actionUtils,
+        "setCompressionLevel"
+    );
 
     const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
     const savedCacheKey = "Linux-node-";
@@ -518,3 +521,54 @@ test("save skips setting compression when value is out of range", async () => {
 
     expect(failedMock).toHaveBeenCalledTimes(0);
 });
+
+test("save skips setting compression when value is negative", async () => {
+    const failedMock = jest.spyOn(core, "setFailed");
+    const setCompressionLevelMock = jest.spyOn(
+        actionUtils,
+        "setCompressionLevel"
+    );
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+    const savedCacheKey = "Linux-node-";
+
+    jest.spyOn(core, "getState")
+        // Cache Entry State
+        .mockImplementationOnce(() => {
+            return savedCacheKey;
+        })
+        // Cache Key State
+        .mockImplementationOnce(() => {
+            return primaryKey;
+        });
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Path, inputPath);
+    testUtils.setInput(Inputs.UploadChunkSize, "4000000");
+    testUtils.setInput(Inputs.CompressionLevel, "-1");
+
+    const cacheId = 4;
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(cacheId);
+        });
+
+    await saveImpl(new StateProvider());
+
+    expect(process.env["ZSTD_CLEVEL"]).toBeUndefined();
+    expect(process.env["GZIP"]).toBeUndefined();
+    expect(setCompressionLevelMock).not.toHaveBeenCalled();
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        {
+            uploadChunkSize: 4000000
+        },
+        false
+    );
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});

__tests__/saveOnly.test.ts

@@ -127,6 +127,42 @@ test("save with valid inputs uploads a cache", async () => {
     expect(failedMock).toHaveBeenCalledTimes(0);
 });
 
+test("negative compression level does not set env vars", async () => {
+    const failedMock = jest.spyOn(core, "setFailed");
+
+    const primaryKey = "Linux-node-bb828da54c148048dd17899ba9fda624811cfb43";
+
+    const inputPath = "node_modules";
+    testUtils.setInput(Inputs.Key, primaryKey);
+    testUtils.setInput(Inputs.Path, inputPath);
+    testUtils.setInput(Inputs.UploadChunkSize, "4000000");
+    testUtils.setInput(Inputs.CompressionLevel, "-2");
+
+    const cacheId = 4;
+    const saveCacheMock = jest
+        .spyOn(cache, "saveCache")
+        .mockImplementationOnce(() => {
+            return Promise.resolve(cacheId);
+        });
+
+    await saveOnlyRun();
+
+    expect(process.env["ZSTD_CLEVEL"]).toBeUndefined();
+    expect(process.env["GZIP"]).toBeUndefined();
+
+    expect(saveCacheMock).toHaveBeenCalledTimes(1);
+    expect(saveCacheMock).toHaveBeenCalledWith(
+        [inputPath],
+        primaryKey,
+        {
+            uploadChunkSize: 4000000
+        },
+        false
+    );
+
+    expect(failedMock).toHaveBeenCalledTimes(0);
+});
+
 test("save failing logs the warning message", async () => {
     const warningMock = jest.spyOn(core, "warning");