diff --git a/package.json b/package.json
index bfcc67984..c3f673500 100644
--- a/package.json
+++ b/package.json
@@ -101,6 +101,7 @@
     "test": "mocha-webpack --webpack-config source/webpack.test.config.js --require source-map-support/register --require test/helpers/browser.js \"test/**/*.test.js\"",
     "test-watch": "mocha-webpack --webpack-config source/webpack.test.config.js --require source-map-support/register --require test/helpers/browser.js \"test/**/*.test.js\" --watch",
     "test-meca": "mocha-webpack --webpack-config source/webpack.test.config.js --require source-map-support/register --require test/helpers/browser.js test/mecanisms.test.js --watch",
+    "test-rules": "mocha-webpack --webpack-config source/webpack.test.config.js --require source-map-support/register --require test/helpers/browser.js test/real-rules.test.js --watch",
     "heroku-postbuild": "npm install --dev && webpack --config source/webpack.config.js --progress",
     "test-inversions": "mocha-webpack --webpack-config source/webpack.test.config.js --require source-map-support/register --require test/helpers/browser.js \"test/inversion.test.js\" --watch"
   }
diff --git a/source/components/rule/Examples.js b/source/components/rule/Examples.js
index 223a817eb..a248861aa 100644
--- a/source/components/rule/Examples.js
+++ b/source/components/rule/Examples.js
@@ -1,52 +1,63 @@
 import React, { Component } from 'react'
-import R, {pick} from 'ramda'
+import R, { pick } from 'ramda'
 import classNames from 'classnames'
-import {connect} from 'react-redux'
-import {
-	disambiguateExampleSituation,
-	collectDefaults
-} from 'Engine/rules.js'
+import { connect } from 'react-redux'
+import { disambiguateExampleSituation, collectDefaults } from 'Engine/rules.js'
 import { analyse } from 'Engine/traverse'
 import './Examples.css'
-import {assume} from '../../reducers'
+import { assume } from '../../reducers'
+import { expect } from 'chai'
+
+// By luck this works as expected for both null and undefined, * but with different branches failing :O *
+export let isFloat = n => Number(n) === n && n % 1 !== 0
+
+// les variables dans les tests peuvent être exprimées relativement à l'espace de nom de la règle,
+// comme dans sa formule
+export let runExamples = (examples, rule, parsedRules) =>
+	examples
+		.map(
+			R.evolve({ situation: disambiguateExampleSituation(parsedRules, rule) })
+		)
+		.map(ex => {
+			let exampleSituationGate = () => name => ex.situation[name]
+
+			let runExample = analyse(parsedRules, rule.name)(
+					assume(exampleSituationGate, collectDefaults(parsedRules))()
+				),
+				exampleValue = runExample.targets[0].nodeValue,
+				goal = ex['valeur attendue'],
+				ok =
+					exampleValue === goal
+						? true
+						: typeof goal === 'number'
+							? Math.abs((exampleValue - goal) / goal) < 0.001
+							: goal === null && exampleValue === 0
+
+			return {
+				...ex,
+				ok,
+				rule: runExample.targets[0]
+			}
+		})
 
 @connect(state => ({
 	situationGate: state.situationGate,
 	parsedRules: state.parsedRules
 }))
 export default class Examples extends Component {
-	runExamples() {
-		let { rule, parsedRules } = this.props,
-			{ exemples: examples = []} = rule
-
-		// les variables dans les tests peuvent être exprimées relativement à l'espace de nom de la règle,
-		// comme dans sa formule
-		return examples.map(R.evolve({situation: disambiguateExampleSituation(parsedRules, rule)})).map(ex => {
-
-			let exampleSituationGate = () => name => ex.situation[name]
-
-			let runExample = analyse(parsedRules, rule.name)(
-					assume(exampleSituationGate, collectDefaults(parsedRules))()
-				),
-				exampleValue = runExample.targets[0].nodeValue
-
-			return {
-				...ex,
-				ok: Math.abs(ex['valeur attendue'] - exampleValue) < 0.1, //TODO on peut sûrement faire mieux...
-				rule: runExample.targets[0]
-			}
-		})
-	}
-
 	render() {
-		let examples = this.runExamples(),
-			focusedExample = R.path(['focusedExample', 'nom'])(this.props),
-			{ inject, situationExists, showValues } = this.props
+		let focusedExample = R.path(['focusedExample', 'nom'])(this.props),
+			{ inject, situationExists, showValues, rule, parsedRules } = this.props,
+			{ exemples = [] } = rule,
+			examples = runExamples(exemples, rule, parsedRules)
 
 		if (!examples.length) return null
 		return (
 			<div id="examples">
-				<h2>Exemples de calcul <small>Cliquez sur un exemple pour le tester</small></h2>
+				<h2>
+					Exemples de calcul{' '}
+					<small>Cliquez sur un exemple pour le tester</small>
+				</h2>
 				{R.isEmpty(examples) ? (
 					<p>
 						<i className="fa fa-exclamation-triangle" aria-hidden="true" />
@@ -78,7 +89,7 @@ export default class Examples extends Component {
 											Ce test ne passe pas
 											{showValues && (
 												<span>
-													: le résultat attendu était {' '}
+													: le résultat attendu était{' '}
 													<span className="expected">{expected}</span>
 												</span>
 											)}
diff --git a/test/mecanisms.test.js b/test/mecanisms.test.js
index f718f90c3..7a704c487 100644
--- a/test/mecanisms.test.js
+++ b/test/mecanisms.test.js
@@ -10,9 +10,7 @@ import { analyse, parseAll } from "../source/engine/traverse"
 import { collectMissingVariables } from "../source/engine/generateQuestions"
 import testSuites from "./load-mecanism-tests"
 import R from "ramda"
-
-// By luck this works as expected for both null and undefined, * but with different branches failing :O *
-let isFloat = n => Number(n) === n && n % 1 !== 0
+import {isFloat} from '../source/components/rule/Examples'
 
 describe("Mécanismes", () =>
   testSuites.map(suite =>
diff --git a/test/real-rules.test.js b/test/real-rules.test.js
new file mode 100644
index 000000000..b283e680d
--- /dev/null
+++ b/test/real-rules.test.js
@@ -0,0 +1,34 @@
+/*
+  Les mécanismes sont testés dans mécanismes/ comme le sont les variables directement dans la base YAML.
+  On y créée dans chaque fichier une base YAML autonome, dans laquelle intervient le mécanisme à tester,
+  puis on teste idéalement tous ses comportements sans en faire intervenir d'autres.
+*/
+
+import { expect, AssertionError } from "chai"
+import { enrichRule, rules } from "../source/engine/rules"
+import { analyse, parseAll } from "../source/engine/traverse"
+import { collectMissingVariables } from "../source/engine/generateQuestions"
+import testSuites from "./load-mecanism-tests"
+import R from "ramda"
+import { runExamples, isFloat } from "../source/components/rule/Examples"
+
+
+let parsedRules = parseAll(rules)
+
+
+describe("Tests des règles de notre base de règles", () =>
+  parsedRules.map(rule => {
+    if (!rule.exemples) return null
+    describe(rule.name, () => {
+      let examples = runExamples(rule.exemples, rule, parsedRules)
+      examples.map(example =>
+        it(example.nom + "", () => {
+          if (!example.ok)
+            throw new AssertionError(`
+              Valeur attendue : ${example['valeur attendue']}
+              Valeur obtenue : ${example.rule.nodeValue}
+            `)
+        })
+      )
+    })
+  }))