@@ -172,6 +172,102 @@ describe("getMinimalServicePathParts - Linux user directories", () => {
172172});
173173});
174174175+describe("getMinimalServicePathParts - Nix Home Manager", () => {
176+it("falls back to default Nix profile when NIX_PROFILES is absent on Linux", () => {
177+const result = getMinimalServicePathParts({
178+platform: "linux",
179+home: "/home/testuser",
180+});
181+182+expect(result).toContain("/home/testuser/.nix-profile/bin");
183+});
184+185+it("falls back to default Nix profile when NIX_PROFILES is absent on macOS", () => {
186+const result = getMinimalServicePathParts({
187+platform: "darwin",
188+home: "/Users/testuser",
189+});
190+191+expect(result).toContain("/Users/testuser/.nix-profile/bin");
192+});
193+194+it("places rightmost NIX_PROFILES entry before leftmost on Linux", () => {
195+const result = getMinimalServicePathPartsFromEnv({
196+platform: "linux",
197+env: {
198+HOME: "/home/testuser",
199+NIX_PROFILES: "/nix/var/nix/profiles/default /home/testuser/.nix-profile",
200+},
201+});
202+203+const userIdx = result.indexOf("/home/testuser/.nix-profile/bin");
204+const defaultIdx = result.indexOf("/nix/var/nix/profiles/default/bin");
205+expect(userIdx).toBeGreaterThan(-1);
206+expect(defaultIdx).toBeGreaterThan(-1);
207+expect(userIdx).toBeLessThan(defaultIdx);
208+});
209+210+it("places rightmost NIX_PROFILES entry before leftmost on macOS", () => {
211+const result = getMinimalServicePathPartsFromEnv({
212+platform: "darwin",
213+env: {
214+HOME: "/Users/testuser",
215+NIX_PROFILES: "/nix/var/nix/profiles/default /Users/testuser/.nix-profile",
216+},
217+});
218+219+const userIdx = result.indexOf("/Users/testuser/.nix-profile/bin");
220+const defaultIdx = result.indexOf("/nix/var/nix/profiles/default/bin");
221+expect(userIdx).toBeGreaterThan(-1);
222+expect(defaultIdx).toBeGreaterThan(-1);
223+expect(userIdx).toBeLessThan(defaultIdx);
224+});
225+226+it("includes single Nix profile from NIX_PROFILES on Linux", () => {
227+const result = getMinimalServicePathPartsFromEnv({
228+platform: "linux",
229+env: {
230+HOME: "/home/testuser",
231+NIX_PROFILES: "/nix/var/nix/profiles/per-user/testuser/profile",
232+},
233+});
234+235+expect(result).toContain("/nix/var/nix/profiles/per-user/testuser/profile/bin");
236+});
237+238+it("includes single Nix profile from NIX_PROFILES on macOS", () => {
239+const result = getMinimalServicePathPartsFromEnv({
240+platform: "darwin",
241+env: {
242+HOME: "/Users/testuser",
243+NIX_PROFILES: "/nix/var/nix/profiles/per-user/testuser/profile",
244+},
245+});
246+247+expect(result).toContain("/nix/var/nix/profiles/per-user/testuser/profile/bin");
248+});
249+250+it("preserves Nix precedence across three profiles", () => {
251+const result = getMinimalServicePathPartsFromEnv({
252+platform: "linux",
253+env: {
254+HOME: "/home/testuser",
255+NIX_PROFILES:
256+"/nix/var/nix/profiles/default /nix/var/nix/profiles/per-user/testuser/custom /home/testuser/.nix-profile",
257+},
258+});
259+260+const userIdx = result.indexOf("/home/testuser/.nix-profile/bin");
261+const customIdx = result.indexOf("/nix/var/nix/profiles/per-user/testuser/custom/bin");
262+const defaultIdx = result.indexOf("/nix/var/nix/profiles/default/bin");
263+expect(userIdx).toBeGreaterThan(-1);
264+expect(customIdx).toBeGreaterThan(-1);
265+expect(defaultIdx).toBeGreaterThan(-1);
266+expect(userIdx).toBeLessThan(customIdx);
267+expect(customIdx).toBeLessThan(defaultIdx);
268+});
269+});
270+175271describe("buildMinimalServicePath", () => {
176272const splitPath = (value: string, platform: NodeJS.Platform) =>
177273value.split(platform === "win32" ? path.win32.delimiter : path.posix.delimiter);
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