diff --git a/tests/AllianceExtensionExecution.test.ts b/tests/AllianceExtensionExecution.test.ts
index 98bd93af1..8e4cbcebb 100644
--- a/tests/AllianceExtensionExecution.test.ts
+++ b/tests/AllianceExtensionExecution.test.ts
@@ -33,6 +33,9 @@ describe("AllianceExtensionExecution", () => {
 
   test("Successfully extends existing alliance", () => {
     jest.spyOn(player1, "canSendAllianceRequest").mockReturnValue(true);
+    jest.spyOn(player2, "isAlive").mockReturnValue(true);
+    jest.spyOn(player1, "isAlive").mockReturnValue(true);
+
     game.addExecution(new AllianceRequestExecution(player1, player2.id()));
     game.executeNextTick();
     game.executeNextTick();
@@ -47,11 +50,15 @@ describe("AllianceExtensionExecution", () => {
     expect(player2.allianceWith(player1)).toBeTruthy();
 
     const allianceBefore = player1.allianceWith(player2)!;
+    const allianceSpy = jest.spyOn(allianceBefore, "extend");
     const expirationBefore =
       allianceBefore.createdAt() + game.config().allianceDuration();
 
     game.addExecution(new AllianceExtensionExecution(player1, player2.id()));
     game.executeNextTick();
+    expect(allianceSpy).toHaveBeenCalledTimes(0); // both players must agree to extend
+    game.addExecution(new AllianceExtensionExecution(player2, player1.id()));
+    game.executeNextTick();
 
     const allianceAfter = player1.allianceWith(player2)!;
 
@@ -61,6 +68,7 @@ describe("AllianceExtensionExecution", () => {
       allianceAfter.createdAt() + game.config().allianceDuration();
 
     expect(expirationAfter).toBeGreaterThanOrEqual(expirationBefore);
+    expect(allianceSpy).toHaveBeenCalledTimes(1);
   });
 
   test("Fails gracefully if no alliance exists", () => {