NR-180723: update integration tests to support postgres-16 (#146)

Makefile

@@ -31,7 +31,7 @@ test:
 integration-test:
 	@echo "=== $(INTEGRATION) === [ test ]: running integration tests..."
 	@docker-compose -f tests/docker-compose.yml pull
-	@go test -v -tags=integration ./tests/. || (ret=$$?; docker-compose -f tests/docker-compose.yml down && exit $$ret)
+	@go test -v -tags=integration -count 1 ./tests/. || (ret=$$?; docker-compose -f tests/docker-compose.yml down && exit $$ret)
 	@docker-compose -f tests/docker-compose.yml down
 
 install: compile

tests/README.md

@@ -0,0 +1,12 @@
+# Integration tests
+
+Steps to update the integration tests for the latest supported version:
+
+1. Update the postgres image in the `postgres-latest-supported` of the [docker-compose](./docker-compose.yml).
+2. Execute the integration tests
+    * If the JSON-schema validation fails:
+        - Check the inventory, some server settings might have been removed.
+        - Check the number of entities: the number of internal tables and or indexes may vary (metrics failures).
+        - Check the release notes ([Postgres 16 example](https://www.postgresql.org/docs/release/16.0/))
+3. Once the failures are understood (if any), update the corresponding JSON-schema files, you may need to generate it
+   using the integration output, specially if there is any metric failure.

tests/docker-compose.yml

@@ -18,8 +18,8 @@ services:
       POSTGRES_PASSWORD: example
       POSTGRES_DB: demo
 
-  postgres-9-2-onwards:
-    image: postgres:13
+  postgres-latest-supported:
+    image: postgres:16
     restart: always
     environment:
       POSTGRES_USER: postgres
@@ -33,7 +33,7 @@ services:
     depends_on:
       - postgres-9-0
       - postgres-9-1
-      - postgres-9-2-onwards
+      - postgres-latest-supported
     volumes:
       - ../:/code
     entrypoint: go run /code/src/main.go

tests/postgresql_test.go

@@ -20,10 +20,10 @@ import (
 
 const (
 	// docker-compose service names
-	serviceNameNRI               = "nri-postgresql"
-	serviceNamePostgres90        = "postgres-9-0"
-	serviceNamePostgres91        = "postgres-9-1"
-	serviceNamePostgres92Onwards = "postgres-9-2-onwards"
+	serviceNameNRI            = "nri-postgresql"
+	serviceNamePostgres90     = "postgres-9-0"
+	serviceNamePostgres91     = "postgres-9-1"
+	serviceNamePostgresLatest = "postgres-latest-supported"
 )
 
 func executeDockerCompose(serviceName string, envVars []string) (string, string, error) {
@@ -66,27 +66,27 @@ func TestSuccessConnection(t *testing.T) {
 		EnvVars  []string
 	}{
 		{
-			Name:     "Testing Metrics for Postgres v9.0x",
+			Name:     "Testing Metrics and inventory for Postgres v9.0x",
 			Hostname: serviceNamePostgres90,
 			Schema:   "jsonschema90.json",
-			EnvVars:  []string{"METRIC=true"},
+			EnvVars:  []string{},
 		},
 		{
-			Name:     "Testing Metrics for Postgres v9.1x",
+			Name:     "Testing Metrics and inventory for Postgres v9.1x",
 			Hostname: serviceNamePostgres91,
 			Schema:   "jsonschema91.json",
-			EnvVars:  []string{"METRIC=true"},
+			EnvVars:  []string{},
 		},
 		{
-			Name:     "Testing Metrics for Postgres v9.2x +",
-			Hostname: serviceNamePostgres92Onwards,
-			Schema:   "jsonschema92.json",
-			EnvVars:  []string{"METRIC=true"},
+			Name:     "Testing Metrics and inventory for latest Postgres supported version",
+			Hostname: serviceNamePostgresLatest,
+			Schema:   "jsonschema-latest.json",
+			EnvVars:  []string{},
 		},
 		{
-			Name:     "Testing Postgres Inventory",
-			Hostname: serviceNamePostgres92Onwards,
-			Schema:   "jsonschema-inventory.json",
+			Name:     "Inventory only for latest Postgres supported version",
+			Hostname: serviceNamePostgresLatest,
+			Schema:   "jsonschema-inventory-latest.json",
 			EnvVars:  []string{"INVENTORY=true"},
 		},
 	}
@@ -111,7 +111,7 @@ func TestSuccessConnection(t *testing.T) {
 
 func TestMissingRequiredVars(t *testing.T) {
 	envVars := []string{
-		"HOSTNAME=" + serviceNamePostgres92Onwards,
+		"HOSTNAME=" + serviceNamePostgresLatest,
 		"DATABASE=demo",
 	}
 	_, stderr, err := executeDockerCompose(serviceNameNRI, envVars)
@@ -121,7 +121,7 @@ func TestMissingRequiredVars(t *testing.T) {
 
 func TestIgnoringDB(t *testing.T) {
 	envVars := []string{
-		"HOSTNAME=" + serviceNamePostgres92Onwards,
+		"HOSTNAME=" + serviceNamePostgresLatest,
 		"USERNAME=postgres",
 		"PASSWORD=example",
 		"DATABASE=demo",