Improve test infrastructure

plugins/mysql/mysql_test.go

@@ -39,7 +39,7 @@ func TestMysqlGeneratesMetrics(t *testing.T) {
 		var count int
 
 		for _, p := range acc.Points {
-			if strings.HasPrefix(p.Name, prefix.prefix) {
+			if strings.HasPrefix(p.Measurement, prefix.prefix) {
 				count++
 			}
 		}

plugins/postgresql/postgresql_test.go

@@ -91,7 +91,7 @@ func TestPostgresqlDefaultsToAllDatabases(t *testing.T) {
 	var found bool
 
 	for _, pnt := range acc.Points {
-		if pnt.Name == "xact_commit" {
+		if pnt.Measurement == "xact_commit" {
 			if pnt.Tags["db"] == "postgres" {
 				found = true
 				break

plugins/system/system_test.go

@@ -272,7 +272,9 @@ func TestSystemStats_GenerateStats(t *testing.T) {
 	require.NoError(t, err)
 
 	dockertags := map[string]string{
-		"id": "blah",
+		"name": "blah",
+		"id": "",
+		"command": "",
 	}
 
 	assert.True(t, acc.CheckTaggedValue("user", 3.1, dockertags))