diff --git a/mon-entreprise/test/cycles.test.js b/mon-entreprise/test/cycles.test.js
index 8d73422fe..3e85b842a 100644
--- a/mon-entreprise/test/cycles.test.js
+++ b/mon-entreprise/test/cycles.test.js
@@ -1,11 +1,26 @@
+<<<<<<< HEAD:mon-entreprise/test/cycles.test.js
 import { parseRules, buildRulesDependencies } from 'publicodes'
+=======
+import graphlib from '@dagrejs/graphlib'
+import { expect } from 'chai'
+import { buildRulesDependencies } from 'Engine/cyclesLib'
+import parseRules from 'Engine/parseRules'
+>>>>>>> cde4da75... WIP ⚙️ Detect cycles: test for cycles using @dagrejs/graphlib:test/cycles.test.js
 import rules from 'Rules'
 
-describe('Graph', () => {
-	it('should get a graph', () => {
-		debugger // Keep this for allowing deactivating other debugger statements via the Chrome inspector
+describe('DottedNames graph', () => {
+	it("shouldn't have cycles", () => {
 		let parsedRules = parseRules(rules)
 		let ruleDependencies = buildRulesDependencies(parsedRules)
-		console.log(ruleDependencies)
+		let g = new graphlib.Graph()
+
+		ruleDependencies.forEach(([ruleDottedName, dependenciesDottedNames]) => {
+			dependenciesDottedNames.forEach(depDottedName => {
+				g.setNode(ruleDottedName, depDottedName)
+			})
+		})
+		const cycles = graphlib.alg.findCycles(g)
+
+		expect(cycles).to.be.an('array').that.is.empty
 	})
 })
diff --git a/yarn.lock b/yarn.lock
index a997ec5ed..038762799 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -899,6 +899,13 @@
     debug "^3.1.0"
     lodash.once "^4.1.1"
 
+"@dagrejs/graphlib@^2.1.4":
+  version "2.1.4"
+  resolved "https://registry.yarnpkg.com/@dagrejs/graphlib/-/graphlib-2.1.4.tgz#86c70e4f073844a2f4ada254c8c7b88a6bdacdb1"
+  integrity sha512-QCg9sL4uhjn468FDEsb/S9hS2xUZSrv/+dApb1Ze5VKO96pTXKNJZ6MGhIpgWkc1TVhbVGH9/7rq/Mf8/jWicw==
+  dependencies:
+    lodash "^4.11.1"
+
 "@emotion/cache@^10.0.27":
   version "10.0.29"
   resolved "https://registry.yarnpkg.com/@emotion/cache/-/cache-10.0.29.tgz#87e7e64f412c060102d589fe7c6dc042e6f9d1e0"
@@ -7493,7 +7500,7 @@ lodash.uniq@^4.5.0:
   resolved "https://registry.yarnpkg.com/lodash.uniq/-/lodash.uniq-4.5.0.tgz#d0225373aeb652adc1bc82e4945339a842754773"
   integrity sha1-0CJTc662Uq3BvILklFM5qEJ1R3M=
 
-lodash@4.17.15, lodash@^4.0.1, lodash@^4.15.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.13, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.17.5, lodash@^4.3.0, lodash@~4.17.4:
+lodash@4.17.15, lodash@^4.0.1, lodash@^4.11.1, lodash@^4.15.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.13, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.3, lodash@^4.17.4, lodash@^4.17.5, lodash@^4.3.0, lodash@~4.17.4:
   version "4.17.15"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
   integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==