unit tests for locking timeouts

services/document-updater/test/unit/coffee/LockManager/tryLockTests.coffee

@@ -19,7 +19,7 @@ describe 'LockManager - trying the lock', ->
 						key_schema:
 							blockingKey: ({doc_id}) -> "Blocking:#{doc_id}"
 			}
-			"./Profiler": class Profiler
+			"./Profiler": @Profiler = class Profiler
 				log: sinon.stub().returns { end: sinon.stub() }
 				end: sinon.stub()
 
@@ -48,3 +48,39 @@ describe 'LockManager - trying the lock', ->
 		it "should return the callback with false", ->
 			@callback.calledWith(null, false).should.equal true
 
+	describe "when it takes a long time for redis to set the lock", ->
+		beforeEach ->
+			@Profiler.prototype.end = () -> 7000 # take a long time
+			@Profiler.prototype.log = sinon.stub().returns { end: @Profiler.prototype.end }
+			@lockValue = "mock-lock-value"
+			@LockManager.randomLock = sinon.stub().returns @lockValue
+			@LockManager.releaseLock = sinon.stub().callsArgWith(2,null)
+			@set.callsArgWith(5, null, "OK")
+
+		describe "in all cases", ->
+			beforeEach ->
+				@LockManager.tryLock @doc_id, @callback
+
+			it "should set the lock key with an expiry if it is not set", ->
+				@set.calledWith("Blocking:#{@doc_id}", @lockValue, "EX", 30, "NX")
+					.should.equal true
+
+			it "should try to release the lock", ->
+				@LockManager.releaseLock.calledWith(@doc_id, @lockValue).should.equal true
+
+		describe "if the lock is released successfully", ->
+			beforeEach ->
+				@LockManager.releaseLock = sinon.stub().callsArgWith(2,null)
+				@LockManager.tryLock @doc_id, @callback
+
+			it "should return the callback with false", ->
+				@callback.calledWith(null, false).should.equal true
+
+		describe "if the lock has already timed out", ->
+			beforeEach ->
+				@LockManager.releaseLock = sinon.stub().callsArgWith(2, new Error("tried to release timed out lock"))
+				@LockManager.tryLock @doc_id, @callback
+
+			it "should return the callback with an error", ->
+				e = new Error("tried to release timed out lock")
+				@callback.calledWith(e).should.equal true