diff --git a/packages/safe-chain/src/packagemanager/uv/runUvCommand.spec.js b/packages/safe-chain/src/packagemanager/uv/runUvCommand.spec.js
new file mode 100644
index 0000000..d908fc0
--- /dev/null
+++ b/packages/safe-chain/src/packagemanager/uv/runUvCommand.spec.js
@@ -0,0 +1,155 @@
+import { describe, it, beforeEach, afterEach, mock } from "node:test";
+import assert from "node:assert";
+
+describe("runUvCommand", () => {
+  let runUv;
+  let capturedArgs = null;
+  let warnings = [];
+  let customEnv = {};
+  let spawnResult = { status: 0 };
+  let spawnError = null;
+
+  beforeEach(async () => {
+    capturedArgs = null;
+    warnings = [];
+    customEnv = {};
+    spawnResult = { status: 0 };
+    spawnError = null;
+
+    mock.module("../../environment/userInteraction.js", {
+      namedExports: {
+        ui: {
+          writeWarning: (msg) => warnings.push(msg),
+          writeError: () => {},
+          writeInfo: () => {},
+          writeVerbose: () => {},
+          writeSuccess: () => {},
+        },
+      },
+    });
+
+    mock.module("../../registryProxy/registryProxy.js", {
+      namedExports: {
+        mergeSafeChainProxyEnvironmentVariables: (env) => ({
+          ...env,
+          ...customEnv,
+          HTTPS_PROXY: "http://localhost:8080",
+          GLOBAL_AGENT_HTTP_PROXY: "http://localhost:8080",
+        }),
+      },
+    });
+
+    mock.module("../../registryProxy/certBundle.js", {
+      namedExports: {
+        getCombinedCaBundlePath: () => "/tmp/test-combined-ca.pem",
+      },
+    });
+
+    mock.module("../../utils/safeSpawn.js", {
+      namedExports: {
+        safeSpawn: async (command, args, options) => {
+          capturedArgs = { command, args, options };
+          if (spawnError) {
+            throw spawnError;
+          }
+          return spawnResult;
+        },
+      },
+    });
+
+    const mod = await import("./runUvCommand.js");
+    runUv = mod.runUv;
+  });
+
+  afterEach(() => {
+    mock.reset();
+  });
+
+  it("sets CA env vars and proxies before spawning", async () => {
+    const res = await runUv("uv", ["pip", "install", "requests"]);
+
+    assert.strictEqual(res.status, 0);
+    assert.ok(capturedArgs, "safeSpawn should have been called");
+
+    assert.strictEqual(capturedArgs.command, "uv");
+    assert.deepStrictEqual(capturedArgs.args, ["pip", "install", "requests"]);
+
+    const env = capturedArgs.options.env;
+    assert.strictEqual(env.SSL_CERT_FILE, "/tmp/test-combined-ca.pem");
+    assert.strictEqual(env.REQUESTS_CA_BUNDLE, "/tmp/test-combined-ca.pem");
+    assert.strictEqual(env.PIP_CERT, "/tmp/test-combined-ca.pem");
+    assert.strictEqual(env.HTTPS_PROXY, "http://localhost:8080");
+  });
+
+  it("sets UV_NATIVE_TLS to false", async () => {
+    await runUv("uv", ["pip", "install", "requests"]);
+
+    assert.ok(capturedArgs, "safeSpawn should have been called");
+    assert.strictEqual(capturedArgs.options.env.UV_NATIVE_TLS, "false");
+  });
+
+  it("warns when overriding UV_NATIVE_TLS that was set to true", async () => {
+    customEnv = { UV_NATIVE_TLS: "true" };
+
+    await runUv("uv", ["pip", "install", "requests"]);
+
+    assert.ok(capturedArgs, "safeSpawn should have been called");
+    assert.strictEqual(capturedArgs.options.env.UV_NATIVE_TLS, "false");
+    assert.ok(
+      warnings.some((w) => w.includes("UV_NATIVE_TLS")),
+      `Expected a warning about UV_NATIVE_TLS override, got: ${warnings.join(", ")}`
+    );
+  });
+
+  it("does not warn when UV_NATIVE_TLS was not set", async () => {
+    await runUv("uv", ["pip", "install", "requests"]);
+
+    assert.ok(
+      !warnings.some((w) => w.includes("UV_NATIVE_TLS")),
+      `Unexpected UV_NATIVE_TLS warning when variable was not set`
+    );
+  });
+
+  it("does not warn when UV_NATIVE_TLS was already false", async () => {
+    customEnv = { UV_NATIVE_TLS: "false" };
+
+    await runUv("uv", ["pip", "install", "requests"]);
+
+    assert.ok(
+      !warnings.some((w) => w.includes("UV_NATIVE_TLS")),
+      `Unexpected UV_NATIVE_TLS warning when variable was already false`
+    );
+  });
+
+  it("sets HTTP_PROXY from HTTPS_PROXY when HTTP_PROXY is missing", async () => {
+    await runUv("uv", ["pip", "install", "requests"]);
+
+    assert.ok(capturedArgs, "safeSpawn should have been called");
+    assert.strictEqual(capturedArgs.options.env.HTTP_PROXY, "http://localhost:8080");
+  });
+
+  it("does not override existing HTTP_PROXY", async () => {
+    customEnv = { HTTP_PROXY: "http://corporate-proxy:3128" };
+
+    await runUv("uv", ["pip", "install", "requests"]);
+
+    assert.ok(capturedArgs, "safeSpawn should have been called");
+    assert.strictEqual(capturedArgs.options.env.HTTP_PROXY, "http://corporate-proxy:3128");
+  });
+
+  it("returns the exit status from safeSpawn", async () => {
+    spawnResult = { status: 42 };
+
+    const res = await runUv("uv", ["pip", "install", "requests"]);
+
+    assert.strictEqual(res.status, 42);
+  });
+
+  it("returns error status when safeSpawn throws", async () => {
+    spawnError = new Error("command not found");
+
+    const res = await runUv("uv", ["pip", "install", "requests"]);
+
+    assert.strictEqual(res.status, 1);
+  });
+});