Add tests to componenttest to make codecov happy (open-telemetry#1231)

Signed-off-by: Bogdan Drutu <[email protected]>

component/componenttest/error_waiting_host_test.go

@@ -19,7 +19,10 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"go.opentelemetry.io/collector/component"
 )
 
 func TestNewErrorWaitingHost(t *testing.T) {
@@ -36,3 +39,12 @@ func TestNewErrorWaitingHost(t *testing.T) {
 	receivedError, _ = mh.WaitForFatalError(100 * time.Millisecond)
 	require.False(t, receivedError)
 }
+
+func TestNewErrorWaitingHost_Noop(t *testing.T) {
+	mh := NewErrorWaitingHost()
+	require.NotNil(t, mh)
+
+	assert.Nil(t, mh.GetExporters())
+	assert.Nil(t, mh.GetExtensions())
+	assert.Nil(t, mh.GetFactory(component.KindReceiver, "test"))
+}

component/componenttest/nop_host_test.go

@@ -18,12 +18,19 @@ import (
 	"errors"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"go.opentelemetry.io/collector/component"
 )
 
 func TestNewNopHost(t *testing.T) {
-	got := NewNopHost()
-	require.IsType(t, &NopHost{}, got)
+	nh := NewNopHost()
+	require.NotNil(t, nh)
+	require.IsType(t, &NopHost{}, nh)
 
-	got.ReportFatalError(errors.New("TestError"))
+	nh.ReportFatalError(errors.New("TestError"))
+	assert.Nil(t, nh.GetExporters())
+	assert.Nil(t, nh.GetExtensions())
+	assert.Nil(t, nh.GetFactory(component.KindReceiver, "test"))
 }