Tools: Autotest: Test for EAHRS misconfiguration prearm failure

* And test for single GPS reporting on Microstrain7

Signed-off-by: Ryan Friedman <ryanfriedman5410+github@gmail.com>

Tools/autotest/arduplane.py

@@ -3104,7 +3104,7 @@ class AutoTestPlane(vehicle_test_suite.TestSuite):
         self.fly_home_land_and_disarm(240)
 
     def fly_external_AHRS(self, sim, eahrs_type, mission):
-        """Fly with external AHRS (VectorNav)"""
+        """Fly with external AHRS"""
         self.customise_SITL_commandline(["--serial4=sim:%s" % sim])
 
         self.set_parameters({
@@ -3228,6 +3228,55 @@ class AutoTestPlane(vehicle_test_suite.TestSuite):
         '''Test InertialLabs EAHRS support'''
         self.fly_external_AHRS("ILabs", 5, "ap1.txt")
 
+    def GpsSensorPreArmEAHRS(self):
+        '''Test pre-arm checks related to EAHRS_SENSORS using the MicroStrain7 driver'''
+        self.customise_SITL_commandline(["--serial4=sim:MicroStrain7"])
+
+        self.set_parameters({
+            "EAHRS_TYPE": 7,
+            "SERIAL4_PROTOCOL": 36,
+            "SERIAL4_BAUD": 230400,
+            "GPS1_TYPE": 0, # Disabled (simulate user setup error)
+            "GPS2_TYPE": 0, # Disabled (simulate user setup error)
+            "AHRS_EKF_TYPE": 11,
+            "INS_GYR_CAL": 1,
+            "EAHRS_SENSORS": 13, # GPS is enabled
+        })
+        self.reboot_sitl()
+        self.delay_sim_time(5)
+        self.progress("Running accelcal")
+        self.run_cmd(
+            mavutil.mavlink.MAV_CMD_PREFLIGHT_CALIBRATION,
+            p5=4,
+            timeout=5,
+        )
+
+        self.assert_prearm_failure("ExternalAHRS: Incorrect number", # Cut short due to message limits.
+                                   timeout=30,
+                                   other_prearm_failures_fatal=False)
+
+        self.set_parameters({
+            "EAHRS_TYPE": 7,
+            "SERIAL4_PROTOCOL": 36,
+            "SERIAL4_BAUD": 230400,
+            "GPS1_TYPE": 1, # Auto
+            "GPS2_TYPE": 21, # EARHS
+            "AHRS_EKF_TYPE": 11,
+            "INS_GYR_CAL": 1,
+            "EAHRS_SENSORS": 13, # GPS is enabled
+        })
+        self.reboot_sitl()
+        self.delay_sim_time(5)
+        self.progress("Running accelcal")
+        self.run_cmd(
+            mavutil.mavlink.MAV_CMD_PREFLIGHT_CALIBRATION,
+            p5=4,
+            timeout=5,
+        )
+        # Check prearm success with MicroStrain when the first GPS is occupied by another GPS.
+        # This supports the use case of comparing MicroStrain dual antenna to another GPS.
+        self.wait_ready_to_arm()
+
     def get_accelvec(self, m):
         return Vector3(m.xacc, m.yacc, m.zacc) * 0.001 * 9.81
 
@@ -5345,6 +5394,7 @@ class AutoTestPlane(vehicle_test_suite.TestSuite):
             self.MicroStrainEAHRS5,
             self.MicroStrainEAHRS7,
             self.InertialLabsEAHRS,
+            self.GpsSensorPreArmEAHRS,
             self.Deadreckoning,
             self.DeadreckoningNoAirSpeed,
             self.EKFlaneswitch,