From e6c52e18a6c1415919a0189c3622ffc9984c6c33 Mon Sep 17 00:00:00 2001
From: battlmonstr <battlmonstr@users.noreply.github.com>
Date: Mon, 16 Oct 2023 15:03:18 +0200
Subject: [PATCH] tests: test that erigon can be used as a library

---
 .github/workflows/test-integration.yml |  5 +++++
 Makefile                               | 18 ++++++++++--------
 tests/erigon-ext-test/.gitignore       |  2 ++
 tests/erigon-ext-test/go.mod.template  |  9 +++++++++
 tests/erigon-ext-test/main.go          | 18 ++++++++++++++++++
 tests/erigon-ext-test/test.sh          | 10 ++++++++++
 6 files changed, 54 insertions(+), 8 deletions(-)
 create mode 100644 tests/erigon-ext-test/.gitignore
 create mode 100644 tests/erigon-ext-test/go.mod.template
 create mode 100644 tests/erigon-ext-test/main.go
 create mode 100755 tests/erigon-ext-test/test.sh

diff --git a/.github/workflows/test-integration.yml b/.github/workflows/test-integration.yml
index ec526d3f3fa..dd90ea72721 100644
--- a/.github/workflows/test-integration.yml
+++ b/.github/workflows/test-integration.yml
@@ -29,6 +29,11 @@ jobs:
       - name: test-integration
         run: make test-integration
 
+      - name: Test erigon as a library
+        env:
+          GIT_COMMIT: ${{ github.event.pull_request.head.sha || github.sha }}
+        run: make test-erigon-ext GIT_COMMIT=$GIT_COMMIT
+
   #        name: history-v3-test-integration
   #        run: make test3-integration
 
diff --git a/Makefile b/Makefile
index 7994a2faefb..9b1e49f16fc 100644
--- a/Makefile
+++ b/Makefile
@@ -140,22 +140,24 @@ db-tools:
 	rm -rf vendor
 	@echo "Run \"$(GOBIN)/mdbx_stat -h\" to get info about mdbx db file."
 
-## test:                              run unit tests with a 100s timeout
-test:
+test-erigon-lib:
 	@cd erigon-lib && $(MAKE) test
+
+test-erigon-ext:
+	@cd tests/erigon-ext-test && ./test.sh $(GIT_COMMIT)
+
+## test:                              run unit tests with a 100s timeout
+test: test-erigon-lib
 	$(GOTEST) --timeout 10m
 
-test3:
-	@cd erigon-lib && $(MAKE) test
+test3: test-erigon-lib
 	$(GOTEST) --timeout 10m -tags $(BUILD_TAGS),e3
 
 ## test-integration:                  run integration tests with a 30m timeout
-test-integration:
-	@cd erigon-lib && $(MAKE) test
+test-integration: test-erigon-lib
 	$(GOTEST) --timeout 240m -tags $(BUILD_TAGS),integration
 
-test3-integration:
-	@cd erigon-lib && $(MAKE) test
+test3-integration: test-erigon-lib
 	$(GOTEST) --timeout 240m -tags $(BUILD_TAGS),integration,e3
 
 ## lint-deps:                         install lint dependencies
diff --git a/tests/erigon-ext-test/.gitignore b/tests/erigon-ext-test/.gitignore
new file mode 100644
index 00000000000..6db33941e3f
--- /dev/null
+++ b/tests/erigon-ext-test/.gitignore
@@ -0,0 +1,2 @@
+go.mod
+go.sum
diff --git a/tests/erigon-ext-test/go.mod.template b/tests/erigon-ext-test/go.mod.template
new file mode 100644
index 00000000000..515b3b14281
--- /dev/null
+++ b/tests/erigon-ext-test/go.mod.template
@@ -0,0 +1,9 @@
+module example.com/erigon-ext-test
+
+go 1.20
+
+require github.com/ledgerwatch/erigon $COMMIT_SHA
+
+replace github.com/ledgerwatch/erigon-lib => github.com/ledgerwatch/erigon/erigon-lib $COMMIT_SHA
+
+require github.com/ethereum/go-ethereum v1.13.3
diff --git a/tests/erigon-ext-test/main.go b/tests/erigon-ext-test/main.go
new file mode 100644
index 00000000000..b8322f5973e
--- /dev/null
+++ b/tests/erigon-ext-test/main.go
@@ -0,0 +1,18 @@
+package main
+
+import (
+	geth_params "github.com/ethereum/go-ethereum/params"
+	// geth_crypto "github.com/ethereum/go-ethereum/crypto"
+	erigon_lib_common "github.com/ledgerwatch/erigon-lib/common"
+	erigon_crypto "github.com/ledgerwatch/erigon/crypto"
+	erigon_params "github.com/ledgerwatch/erigon/params"
+)
+
+func main() {
+	println("Erigon version: ", erigon_params.Version)
+	println("geth version: ", geth_params.Version)
+	println("Erigon lib common eth Wei: ", erigon_lib_common.Wei)
+	println("Erigon crypto secp256k1 S256 BitSize: ", erigon_crypto.S256().Params().BitSize)
+	// not working due to duplicate symbols errors
+	// println("geth crypto secp256k1 S256 BitSize: ", geth_crypto.S256().Params().BitSize)
+}
diff --git a/tests/erigon-ext-test/test.sh b/tests/erigon-ext-test/test.sh
new file mode 100755
index 00000000000..362028e5fe7
--- /dev/null
+++ b/tests/erigon-ext-test/test.sh
@@ -0,0 +1,10 @@
+#!/bin/bash
+
+COMMIT_SHA="$1"
+
+sed "s/\$COMMIT_SHA/$COMMIT_SHA/" go.mod.template > go.mod
+
+rm -f go.sum
+go mod tidy
+
+go run main.go