From 463f0a060111430a9408dda632cb068941232117 Mon Sep 17 00:00:00 2001
From: Moriz Wahl <moriz.wahl@gmx.de>
Date: Wed, 12 Oct 2022 19:30:06 +0200
Subject: [PATCH 1/3] feat: Global Jest Extension for Decimal Equal

---
 backend/jest.config.js                        |  1 +
 .../graphql/resolver/AdminResolver.test.ts    |  2 +-
 backend/test/extensions.ts                    | 31 +++++++++++++++++++
 3 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 backend/test/extensions.ts

diff --git a/backend/jest.config.js b/backend/jest.config.js
index 6ab44002c..a472df316 100644
--- a/backend/jest.config.js
+++ b/backend/jest.config.js
@@ -5,6 +5,7 @@ module.exports = {
   collectCoverage: true,
   collectCoverageFrom: ['src/**/*.ts', '!**/node_modules/**', '!src/seeds/**', '!build/**'],
   setupFiles: ['<rootDir>/test/testSetup.ts'],
+  setupFilesAfterEnv: ['<rootDir>/test/extensions.ts'],
   modulePathIgnorePatterns: ['<rootDir>/build/'],
   moduleNameMapper: {
     '@/(.*)': '<rootDir>/src/$1',
diff --git a/backend/src/graphql/resolver/AdminResolver.test.ts b/backend/src/graphql/resolver/AdminResolver.test.ts
index b1b4e469e..34888b2df 100644
--- a/backend/src/graphql/resolver/AdminResolver.test.ts
+++ b/backend/src/graphql/resolver/AdminResolver.test.ts
@@ -1990,7 +1990,7 @@ describe('AdminResolver', () => {
                 deletedAt: null,
                 code: expect.stringMatching(/^[0-9a-f]{24,24}$/),
                 linkEnabled: true,
-                // amount: '200',
+                amount: expect.decimalEqual(200),
                 // maxAmountPerMonth: '200',
               }),
             )
diff --git a/backend/test/extensions.ts b/backend/test/extensions.ts
new file mode 100644
index 000000000..49a92f521
--- /dev/null
+++ b/backend/test/extensions.ts
@@ -0,0 +1,31 @@
+import Decimal from 'decimal.js-light'
+
+expect.extend({
+  decimalEqual(received, value) {
+    const pass = new Decimal(value).equals(received.toString())
+    if (pass) {
+      return {
+        message: () => `expected ${received} to not equal ${value}`,
+        pass: true,
+      }
+    } else {
+      return {
+        message: () => `expected ${received} to equal ${value}`,
+        pass: false,
+      }
+    }
+  },
+})
+
+interface CustomMatchers<R = unknown> {
+  decimalEqual(value: number): R
+}
+
+declare global {
+  // eslint-disable-next-line @typescript-eslint/no-namespace
+  namespace jest {
+    type Expect = CustomMatchers
+    type Matchers<R> = CustomMatchers<R>
+    type InverseAsymmetricMatchers = CustomMatchers
+  }
+}

From 39982759f2d2c307fe55907bb5afde755673d3cc Mon Sep 17 00:00:00 2001
From: Moriz Wahl <moriz.wahl@gmx.de>
Date: Wed, 12 Oct 2022 19:40:26 +0200
Subject: [PATCH 2/3] test more decimal values coming from DB

---
 backend/src/graphql/resolver/AdminResolver.test.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/backend/src/graphql/resolver/AdminResolver.test.ts b/backend/src/graphql/resolver/AdminResolver.test.ts
index 34888b2df..a2eacc990 100644
--- a/backend/src/graphql/resolver/AdminResolver.test.ts
+++ b/backend/src/graphql/resolver/AdminResolver.test.ts
@@ -1991,7 +1991,7 @@ describe('AdminResolver', () => {
                 code: expect.stringMatching(/^[0-9a-f]{24,24}$/),
                 linkEnabled: true,
                 amount: expect.decimalEqual(200),
-                // maxAmountPerMonth: '200',
+                maxAmountPerMonth: expect.decimalEqual(200),
               }),
             )
           })
@@ -2280,7 +2280,7 @@ describe('AdminResolver', () => {
                   id: linkId,
                   name: 'Dokumenta 2023',
                   memo: 'Danke für deine Teilnahme an der Dokumenta 2023',
-                  // amount: '400',
+                  amount: expect.decimalEqual(400),
                 }),
               )
             })

From 25e461188cf35311719116f93472c59137675e21 Mon Sep 17 00:00:00 2001
From: Moriz Wahl <moriz.wahl@gmx.de>
Date: Thu, 13 Oct 2022 09:04:29 +0200
Subject: [PATCH 3/3] ignore eslint rule no-empty-interface

---
 backend/test/extensions.ts | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/backend/test/extensions.ts b/backend/test/extensions.ts
index 49a92f521..69c2ff7a6 100644
--- a/backend/test/extensions.ts
+++ b/backend/test/extensions.ts
@@ -1,3 +1,5 @@
+/* eslint-disable @typescript-eslint/no-empty-interface */
+
 import Decimal from 'decimal.js-light'
 
 expect.extend({
@@ -24,8 +26,8 @@ interface CustomMatchers<R = unknown> {
 declare global {
   // eslint-disable-next-line @typescript-eslint/no-namespace
   namespace jest {
-    type Expect = CustomMatchers
-    type Matchers<R> = CustomMatchers<R>
-    type InverseAsymmetricMatchers = CustomMatchers
+    interface Expect extends CustomMatchers {}
+    interface Matchers<R> extends CustomMatchers<R> {}
+    interface InverseAsymmetricMatchers extends CustomMatchers {}
   }
 }