Run integration tests nightly and include captive core (#3114)

.circleci/config.yml

@@ -212,6 +212,22 @@ commands:
           name: Send report to codecov.io
           command: bash <(curl -s https://codecov.io/bash)
 
+  # run_horizon_integration_tests runs Horizon's integration tests
+  run_horizon_integration_tests:
+    parameters:
+      enable-captive-core:
+        type: boolean
+        default: false
+    steps:
+      - run:
+          name: Run Horizon integration tests <<# parameters.enable-captive-core >>(With captive core)<</ parameters.enable-captive-core >>
+          # Currently all integration tests are in a single directory.
+          # Pulling the image helps with test running time
+          command: |
+            cd ~/go/src/github.com/stellar/go
+            docker pull stellar/quickstart:testing
+            <<# parameters.enable-captive-core >>HORIZON_INTEGRATION_ENABLE_CAPTIVE_CORE=true<</ parameters.enable-captive-core >> go test -timeout 20m -v ./services/horizon/internal/integration/...
+
 #-----------------------------------------------------------------------------#
 # Jobs use the commands to accomplish a given task, and run through workflows #
 #-----------------------------------------------------------------------------#
@@ -401,14 +417,12 @@ jobs:
             echo "export HORIZON_BIN_DIR=~/go/src/github.com/stellar/go" >> $BASH_ENV
       - install_golang
       - build_horizon
-      - run:
-          name: Run Horizon integration tests only
-          # Currently all integration tests are in a single directory.
-          # Pulling the image helps with test running time
-          command: |
-            cd ~/go/src/github.com/stellar/go
-            docker pull stellar/quickstart:testing
-            go test -timeout 20m -v ./services/horizon/internal/integration/...
+      # run the integration tests ...
+      #   ... without captive core
+      - run_horizon_integration_tests
+      #   ... and with captive core
+      - run_horizon_integration_tests:
+          enable-captive-core: true
 #-------------------------------------------------------------------------#
 # Workflows orchestrate jobs and make sure they run in the right sequence #
 #-------------------------------------------------------------------------#
@@ -423,6 +437,7 @@ workflows:
       - test_code_1_14_postgres10
       - test_code_1_15
       - test_code_1_15_postgres10
+      # TODO: remove once integration_tests_nightly is confirmed to be working
       - test_horizon_integration
       - publish_state_diff_docker_image:
           filters:
@@ -462,3 +477,16 @@ workflows:
           # Pushing stellar/horizon:latest to docker hub requires manual approval
           requires:
             - hold
+
+  integration_tests_nightly:
+    triggers:
+      - schedule:
+          # Every day
+          cron: "0 0 * * *"
+          filters:
+            branches:
+              only:
+                - master
+                - /release-horizon-/
+    jobs:
+      - test_horizon_integration