diff --git a/data/mods/TEST_DATA/missions.json b/data/mods/TEST_DATA/missions.json
index 59f02cf8569db..35b52067673da 100644
--- a/data/mods/TEST_DATA/missions.json
+++ b/data/mods/TEST_DATA/missions.json
@@ -27,5 +27,21 @@
     "copy-from": "TEST_MISSION_GOAL_CONDITION1",
     "goal": "MGOAL_CONDITION",
     "origins": [  ]
+  },
+  {
+    "//COMMENT": "Dummy EOCs to prevent the startup chain from triggering missions in the test environment.",
+    "type": "effect_on_condition",
+    "id": "EOC_FACTION_SUCCESSION_COOLDOWN_GAMEBEGIN_CHECK",
+    "eoc_type": "EVENT",
+    "required_event": "game_begin",
+    "effect": [  ]
+  },
+  {
+    "//COMMENT": "Dummy EOCs to prevent the startup chain from triggering missions in the test environment.",
+    "type": "effect_on_condition",
+    "id": "EOC_FACTION_SUCCESSION_COOLDOWN_GAMESTART_CHECK",
+    "eoc_type": "EVENT",
+    "required_event": "game_start",
+    "effect": [  ]
   }
 ]