Add config tests

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

config/config_test.go

@@ -156,6 +156,12 @@ var expectedConf = &Config{
 		},
 	},
 
+	OTLPConfig: OTLPConfig{
+		PromoteResourceAttributes: []string{
+			"k8s.cluster.name", "k8s.job.name", "k8s.namespace.name",
+		},
+	},
+
 	RemoteReadConfigs: []*RemoteReadConfig{
 		{
 			URL:           mustParseURL("http://remote1/read"),
@@ -1471,6 +1477,18 @@ func TestRemoteWriteRetryOnRateLimit(t *testing.T) {
 	require.False(t, got.RemoteWriteConfigs[1].QueueConfig.RetryOnRateLimit)
 }
 
+func TestOTLPSanitizeResourceAttributes(t *testing.T) {
+	want, err := LoadFile(filepath.Join("testdata", "otlp_sanitize_resource_attributes.good.yml"), false, false, log.NewNopLogger())
+	require.NoError(t, err)
+
+	out, err := yaml.Marshal(want)
+	require.NoError(t, err)
+	var got Config
+	require.NoError(t, yaml.UnmarshalStrict(out, &got))
+
+	require.Equal(t, []string{"k8s.cluster.name", "k8s.job.name", "k8s.namespace.name"}, got.OTLPConfig.PromoteResourceAttributes)
+}
+
 func TestLoadConfig(t *testing.T) {
 	// Parse a valid file that sets a global scrape timeout. This tests whether parsing
 	// an overwritten default field in the global config permanently changes the default.

config/testdata/conf.good.yml

@@ -45,6 +45,9 @@ remote_write:
     headers:
       name: value
 
+otlp:
+  promote_resource_attributes: ["k8s.cluster.name", "k8s.job.name", "k8s.namespace.name"]
+
 remote_read:
   - url: http://remote1/read
     read_recent: true

config/testdata/otlp_sanitize_resource_attributes.good.yml

@@ -0,0 +1,2 @@
+otlp:
+  promote_resource_attributes: ["k8s.cluster.name", "k8s.job.name", "k8s.namespace.name", " k8s.job.name "]