diff --git a/backend/jest.config.ts b/backend/jest.config.ts
index 5576bfe80..14f932f98 100644
--- a/backend/jest.config.ts
+++ b/backend/jest.config.ts
@@ -7,11 +7,14 @@ const config: Config.InitialOptions = {
   automock: false,
   collectCoverage: true,
   collectCoverageFrom: ["./src/**/**.ts"],
-  coverageProvider: "v8",
+  coverageProvider: "babel",
   coverageThreshold: {
     global: {
       lines: 1
     }
-  }
+  },
+  setupFiles: [
+    "./testSetup.ts",
+  ],
 }
 export default config;
diff --git a/backend/src/__tests__/api/difficulty-adjustment.test.ts b/backend/src/__tests__/api/difficulty-adjustment.test.ts
new file mode 100644
index 000000000..4cee25c2f
--- /dev/null
+++ b/backend/src/__tests__/api/difficulty-adjustment.test.ts
@@ -0,0 +1,60 @@
+import { calcDifficultyAdjustment, DifficultyAdjustment } from '../../api/difficulty-adjustment';
+
+test('should calculate Difficulty Adjustments properly', () => {
+  const dt = (dtString) => {
+    return Math.floor(new Date(dtString).getTime() / 1000);
+  };
+
+  const vectors = [
+    [ // Vector 1
+      [ // Inputs
+        dt('2022-08-18T11:07:00.000Z'), // Last DA time (in seconds)
+        dt('2022-08-19T14:03:53.000Z'), // Current time (now) (in seconds)
+        750134,                         // Current block height
+        0.6280047707459726,             // Previous retarget % (Passed through)
+        'mainnet',                      // Network (if testnet, next value is non-zero)
+        0,                              // If not testnet, not used
+      ],
+      { // Expected Result
+        progressPercent: 9.027777777777777,
+        difficultyChange: 12.562233927411782,
+        estimatedRetargetDate: 1661895424692,
+        remainingBlocks: 1834,
+        remainingTime: 977591692,
+        previousRetarget: 0.6280047707459726,
+        nextRetargetHeight: 751968,
+        timeAvg: 533038,
+        timeOffset: 0,
+      },
+    ],
+    [ // Vector 2 (testnet)
+      [ // Inputs
+        dt('2022-08-18T11:07:00.000Z'), // Last DA time (in seconds)
+        dt('2022-08-19T14:03:53.000Z'), // Current time (now) (in seconds)
+        750134,                         // Current block height
+        0.6280047707459726,             // Previous retarget % (Passed through)
+        'testnet',                      // Network
+        dt('2022-08-19T13:52:46.000Z'), // Latest block timestamp in seconds
+      ],
+      { // Expected Result is same other than timeOffset
+        progressPercent: 9.027777777777777,
+        difficultyChange: 12.562233927411782,
+        estimatedRetargetDate: 1661895424692,
+        remainingBlocks: 1834,
+        remainingTime: 977591692,
+        previousRetarget: 0.6280047707459726,
+        nextRetargetHeight: 751968,
+        timeAvg: 533038,
+        timeOffset: -667000, // 11 min 7 seconds since last block (testnet only)
+        // If we add time avg to abs(timeOffset) it makes exactly 1200000 ms, or 20 minutes
+      },
+    ],
+  ] as [[number, number, number, number, string, number], DifficultyAdjustment][];
+
+  for (const vector of vectors) {
+    const result = calcDifficultyAdjustment(...vector[0]);
+    // previousRetarget is passed through untouched
+    expect(result.previousRetarget).toStrictEqual(vector[0][3]);
+    expect(result).toStrictEqual(vector[1]);
+  }
+});
diff --git a/backend/src/__tests__/config.test.ts b/backend/src/__tests__/config.test.ts
index b469d3e07..7314fde6f 100644
--- a/backend/src/__tests__/config.test.ts
+++ b/backend/src/__tests__/config.test.ts
@@ -136,63 +136,4 @@ describe('Mempool Backend Config', () => {
       expect(config.EXTERNAL_DATA_SERVER).toStrictEqual(fixture.EXTERNAL_DATA_SERVER);
     });
   });
-
-  test('should calculate Difficulty Adjustments properly', () => {
-    jest.isolateModules(() => {
-      const { calcDifficultyAdjustment } = jest.requireActual('../api/difficulty-adjustment');
-      const dt = dtString => Math.floor(new Date(dtString).getTime() / 1000);
-      const vectors = [
-        [ // Vector 1
-          [ // Inputs
-            dt('2022-08-18T11:07:00.000Z'), // Last DA time (in seconds)
-            dt('2022-08-19T14:03:53.000Z'), // Current time (now) (in seconds)
-            750134,                         // Current block height
-            0.6280047707459726,             // Previous retarget % (Passed through)
-            'mainnet',                      // Network (if testnet, next value is non-zero)
-            0,                              // If not testnet, not used
-          ],
-          { // Expected Result
-            progressPercent: 9.027777777777777,
-            difficultyChange: 12.562233927411782,
-            estimatedRetargetDate: 1661895424692,
-            remainingBlocks: 1834,
-            remainingTime: 977591692,
-            previousRetarget: 0.6280047707459726,
-            nextRetargetHeight: 751968,
-            timeAvg: 533038,
-            timeOffset: 0,
-          },
-        ],
-        [ // Vector 2 (testnet)
-          [ // Inputs
-            dt('2022-08-18T11:07:00.000Z'), // Last DA time (in seconds)
-            dt('2022-08-19T14:03:53.000Z'), // Current time (now) (in seconds)
-            750134,                         // Current block height
-            0.6280047707459726,             // Previous retarget % (Passed through)
-            'testnet',                      // Network
-            dt('2022-08-19T13:52:46.000Z'), // Latest block timestamp in seconds
-          ],
-          { // Expected Result is same other than timeOffset
-            progressPercent: 9.027777777777777,
-            difficultyChange: 12.562233927411782,
-            estimatedRetargetDate: 1661895424692,
-            remainingBlocks: 1834,
-            remainingTime: 977591692,
-            previousRetarget: 0.6280047707459726,
-            nextRetargetHeight: 751968,
-            timeAvg: 533038,
-            timeOffset: -667000, // 11 min 7 seconds since last block (testnet only)
-            // If we add time avg to abs(timeOffset) it makes exactly 1200000 ms, or 20 minutes
-          },
-        ],
-      ] as [[number, number, number, number, string, number], any][];
-
-      for (const vector of vectors) {
-        const result = calcDifficultyAdjustment(...vector[0]);
-        // previousRetarget is passed through untouched
-        expect(result.previousRetarget).toStrictEqual(vector[0][3]);
-        expect(result).toStrictEqual(vector[1]);
-      }
-    });
-  });
 });
diff --git a/backend/testSetup.ts b/backend/testSetup.ts
new file mode 100644
index 000000000..dda44ef6e
--- /dev/null
+++ b/backend/testSetup.ts
@@ -0,0 +1 @@
+jest.mock('./mempool-config.json', () => ({}), { virtual: true });