diff --git a/nixos/tests/prometheus-exporters.nix b/nixos/tests/prometheus-exporters.nix
index 41a0365988221..431c82c2e71a4 100644
--- a/nixos/tests/prometheus-exporters.nix
+++ b/nixos/tests/prometheus-exporters.nix
@@ -600,16 +600,73 @@ let
 
     ipmi =
       { pkgs, ... }:
+      let
+        exporterConfig = pkgs.writeText "ipmi-exporter.yml" ''
+          modules:
+            default:
+              user: ipmiusr
+              pass: test
+              privilege: admin
+              driver: LAN_2_0
+              timeout: 2000
+              # necessary for openipmi bmc, per ipmi-sensors(8)
+              workaround_flags:
+                - opensesspriv
+              collectors:
+                - ipmi
+        '';
+        simulatorConfig = pkgs.writeText "ipmi-simulator.conf" ''
+          name "ipmisim1"
+
+          startlan 1
+            addr 192.168.1.1 623
+            priv_limit admin
+            guid a123456789abcdefa123456789abcdef
+          endlan
+
+          user 2 true "ipmiusr" "test" admin 10
+        '';
+        simulatorCommands = "${pkgs.openipmi}/etc/ipmi/ipmisim1.emu";
+      in
       {
         maintainers = pkgs.freeipmi.meta.maintainers;
         exporterConfig = {
           enable = true;
+          configFile = exporterConfig;
+        };
+        metricProvider = {
+          networking.firewall.allowedUDPPorts = [ 623 ];
+          systemd.services.ipmi-simulator = {
+            wantedBy = [ "multi-user.target" ];
+            after = [ "network.target" ];
+            preStart = ''
+              # ipmi_sim expects specific name for its SDR.
+              ${pkgs.coreutils}/bin/install -Dm600 \
+                ${pkgs.openipmi}/share/openipmi/ipmisim1.bsdr \
+                /run/ipmi-simulator/ipmi_sim/ipmisim1/sdr.20.main
+            '';
+            serviceConfig = {
+              ExecStart = ''
+                ${pkgs.openipmi}/bin/ipmi_sim -n \
+                  -c ${simulatorConfig} \
+                  -f ${simulatorCommands} \
+                  -s /run/ipmi-simulator
+              '';
+              RuntimeDirectory = "ipmi-simulator";
+            };
+          };
         };
         exporterTest = ''
+          wait_for_unit("ipmi-simulator.service")
+          wait_until_succeeds("ss -lunp | grep -F '192.168.1.1:623'")
           wait_for_unit("prometheus-ipmi-exporter.service")
           wait_for_open_port(9290)
+
+          # ipmi_sim command file sets MBTemp = 0x60 (96).
           succeed(
-            "curl -sSf http://localhost:9290/metrics | grep 'ipmi_scrape_duration_seconds'"
+            "curl -sSf 'http://localhost:9290/ipmi?target=192.168.1.1' > /tmp/ipmi-metrics",
+            "grep -F 'ipmi_up{collector=\"ipmi\"} 1' /tmp/ipmi-metrics",
+            "grep -F 'ipmi_temperature_celsius{id=\"3\",name=\"MBTemp\"} 96' /tmp/ipmi-metrics",
           )
         '';
       };
diff --git a/pkgs/by-name/fr/freeipmi/package.nix b/pkgs/by-name/fr/freeipmi/package.nix
index 1f21e55247f39..0209ec777673b 100644
--- a/pkgs/by-name/fr/freeipmi/package.nix
+++ b/pkgs/by-name/fr/freeipmi/package.nix
@@ -7,6 +7,7 @@
   libgcrypt,
   readline,
   libgpg-error,
+  nixosTests,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
@@ -44,6 +45,8 @@ stdenv.mkDerivation (finalAttrs: {
 
   doCheck = true;
 
+  passthru.tests = { inherit (nixosTests.prometheus-exporters) ipmi; };
+
   meta = {
     description = "Implementation of the Intelligent Platform Management Interface";
 
diff --git a/pkgs/by-name/op/openipmi/package.nix b/pkgs/by-name/op/openipmi/package.nix
index 99bb16107d7ea..cc3ff64a00621 100644
--- a/pkgs/by-name/op/openipmi/package.nix
+++ b/pkgs/by-name/op/openipmi/package.nix
@@ -1,12 +1,14 @@
 {
   stdenv,
   buildPackages,
+  fetchpatch,
   fetchurl,
   popt,
   ncurses,
   python3,
   readline,
   lib,
+  nixosTests,
   openssl,
 }:
 
@@ -19,6 +21,20 @@ stdenv.mkDerivation (finalAttrs: {
     sha256 = "sha256-xi049dp99Cmaw6ZSUI6VlTd1JEAYHjTHayrs69fzAbk=";
   };
 
+  patches = [
+    # Fix broken command order in shipped ipmisim1:
+    (fetchpatch {
+      url = "https://github.com/cminyard/openipmi/commit/07adcedd824496d69be469101a7be1bbe371741a.patch";
+      hash = "sha256-zAbnyliZr5HV9dYlyse4ff1lYJty+/74aqmXHWJM13c=";
+    })
+
+    # Sensors not marked ready after set_sensor_value.
+    (fetchpatch {
+      url = "https://github.com/cminyard/openipmi/commit/2325cc63727bab6a0f29fca2db4ba7d69c11e3b9.patch";
+      hash = "sha256-ZbxV7ThFDbI5vxlLLavMrAZzCj3gPnR0sRcyHub5S30=";
+    })
+  ];
+
   postConfigure = lib.optionalString (!stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
     substituteInPlace lanserv/Makefile \
       --replace-fail "sdrcomp/sdrcomp_build -o" "${buildPackages.openipmi}/bin/sdrcomp -o"
@@ -42,6 +58,13 @@ stdenv.mkDerivation (finalAttrs: {
     "BUILD_CC=${stdenv.cc.targetPrefix}cc"
   ];
 
+  # Include SDR files; ipmi-sim requires .bsdr (installed as sdr.20.main) to
+  # advertise its sensor names.
+  postInstall = ''
+    install -Dm444 lanserv/ipmisim1.sdrs $out/share/openipmi/ipmisim1.sdrs
+    install -Dm444 lanserv/ipmisim1.bsdr $out/share/openipmi/ipmisim1.bsdr
+  '';
+
   outputs = [
     "out"
     "lib"
@@ -49,6 +72,8 @@ stdenv.mkDerivation (finalAttrs: {
     "man"
   ];
 
+  passthru.tests = { inherit (nixosTests.prometheus-exporters) ipmi; };
+
   meta = {
     homepage = "https://openipmi.sourceforge.io/";
     description = "User-level library that provides a higher-level abstraction of IPMI and generic services";