diff --git a/pkg/acquisition/modules/cloudwatch/cloudwatch_test.go b/pkg/acquisition/modules/cloudwatch/cloudwatch_test.go
index 1cabcc035..d922909a4 100644
--- a/pkg/acquisition/modules/cloudwatch/cloudwatch_test.go
+++ b/pkg/acquisition/modules/cloudwatch/cloudwatch_test.go
@@ -757,48 +757,25 @@ func TestOneShotAcquisition(t *testing.T) {
 			if tc.setup != nil {
 				tc.setup(t, &cw)
 			}
-			out := make(chan types.Event)
+			out := make(chan types.Event, 100)
 			tmb := tomb.Tomb{}
 			var rcvdEvts []types.Event
 
 			dbgLogger.Infof("running StreamingAcquisition")
-			actmb := tomb.Tomb{}
-			actmb.Go(func() error {
-				err := cw.OneShotAcquisition(out, &actmb)
-				dbgLogger.Infof("acquis done")
-				cstest.RequireErrorContains(t, err, tc.expectedStartErr)
-				return nil
-			})
-
+			err = cw.OneShotAcquisition(out, &tmb)
+			dbgLogger.Infof("acquis done")
+			cstest.RequireErrorContains(t, err, tc.expectedStartErr)
+			close(out)
 			// let's empty output chan
-			tmb.Go(func() error {
-				for {
-					select {
-					case in := <-out:
-						log.Debugf("received event %+v", in)
-						rcvdEvts = append(rcvdEvts, in)
-					case <-tmb.Dying():
-						log.Debugf("pumper died")
-						return nil
-					}
-				}
-			})
+			for evt := range out {
+				rcvdEvts = append(rcvdEvts, evt)
+			}
 
 			if tc.run != nil {
 				tc.run(t, &cw)
 			} else {
 				dbgLogger.Warning("no code to run")
 			}
-
-			time.Sleep(5 * time.Second)
-			dbgLogger.Infof("killing collector")
-			tmb.Kill(nil)
-			<-tmb.Dead()
-			dbgLogger.Infof("killing datasource")
-			actmb.Kill(nil)
-			dbgLogger.Infof("waiting datasource death")
-			<-actmb.Dead()
-			// check results
 			if tc.expectedResLen != -1 {
 				if tc.expectedResLen != len(rcvdEvts) {
 					t.Fatalf("%s : expected %d results got %d -> %v", tc.name, tc.expectedResLen, len(rcvdEvts), rcvdEvts)
diff --git a/pkg/acquisition/modules/docker/docker_test.go b/pkg/acquisition/modules/docker/docker_test.go
index 8928c1ae2..d019da314 100644
--- a/pkg/acquisition/modules/docker/docker_test.go
+++ b/pkg/acquisition/modules/docker/docker_test.go
@@ -307,29 +307,14 @@ func TestOneShot(t *testing.T) {
 			t.Fatalf("unable to configure dsn '%s': %s", ts.dsn, err)
 		}
 		dockerClient.Client = new(mockDockerCli)
-		out := make(chan types.Event)
-		actualLines := 0
-		if ts.expectedLines != 0 {
-			go func() {
-			READLOOP:
-				for {
-					select {
-					case <-out:
-						actualLines++
-					case <-time.After(1 * time.Second):
-						break READLOOP
-					}
-				}
-			}()
-		}
+		out := make(chan types.Event, 100)
 		tomb := tomb.Tomb{}
 		err := dockerClient.OneShotAcquisition(out, &tomb)
 		cstest.AssertErrorContains(t, err, ts.expectedErr)
 
 		// else we do the check before actualLines is incremented ...
-		time.Sleep(1 * time.Second)
 		if ts.expectedLines != 0 {
-			assert.Equal(t, ts.expectedLines, actualLines)
+			assert.Equal(t, ts.expectedLines, len(out))
 		}
 	}
 
diff --git a/pkg/acquisition/modules/journalctl/journalctl_test.go b/pkg/acquisition/modules/journalctl/journalctl_test.go
index 5511a01e3..04280943a 100644
--- a/pkg/acquisition/modules/journalctl/journalctl_test.go
+++ b/pkg/acquisition/modules/journalctl/journalctl_test.go
@@ -151,27 +151,12 @@ journalctl_filter:
 			})
 		}
 		tomb := tomb.Tomb{}
-		out := make(chan types.Event)
+		out := make(chan types.Event, 100)
 		j := JournalCtlSource{}
 		err := j.Configure([]byte(ts.config), subLogger)
 		if err != nil {
 			t.Fatalf("Unexpected error : %s", err)
 		}
-		actualLines := 0
-		if ts.expectedLines != 0 {
-			go func() {
-			READLOOP:
-				for {
-					select {
-					case <-out:
-						actualLines++
-					case <-time.After(1 * time.Second):
-						break READLOOP
-					}
-				}
-			}()
-		}
-
 		err = j.OneShotAcquisition(out, &tomb)
 		cstest.AssertErrorContains(t, err, ts.expectedErr)
 		if err != nil {
@@ -179,7 +164,7 @@ journalctl_filter:
 		}
 
 		if ts.expectedLines != 0 {
-			assert.Equal(t, ts.expectedLines, actualLines)
+			assert.Equal(t, ts.expectedLines, len(out))
 		}
 
 		if ts.expectedOutput != "" {