Add more unit tests in the otlp exporter for the config validation

exporter/otlpexporter/otlp_test.go

@@ -795,3 +795,28 @@ func TestSendLogData(t *testing.T) {
 	assert.Len(t, observed.FilterLevelExact(zap.WarnLevel).All(), 1)
 	assert.Contains(t, observed.FilterLevelExact(zap.WarnLevel).All()[0].Message, "Partial success")
 }
+
+func TestExporterConfigValidation(t *testing.T) {
+	// Start an OTLP exporter and point to the receiver.
+	factory := NewFactory()
+	cfg := factory.CreateDefaultConfig().(*Config)
+
+	// Validate that the error is thrown when no port is specified in the address
+	cfg.ClientConfig = configgrpc.ClientConfig{
+		Endpoint: "localhost",
+	}
+	assert.Error(t, cfg.Validate())
+
+	// Validate that missing endpoint fails validations
+	cfg.ClientConfig = configgrpc.ClientConfig{
+		Endpoint: "",
+	}
+	assert.Error(t, cfg.Validate())
+
+	// Validate a valid endpoint with port throws no error
+	cfg.ClientConfig = configgrpc.ClientConfig{
+		Endpoint: "localhost:1234",
+	}
+	assert.NoError(t, cfg.Validate())
+
+}