diff --git a/src/quality-profiles.test.ts b/src/quality-profiles.test.ts
index e3c208b..1855f05 100644
--- a/src/quality-profiles.test.ts
+++ b/src/quality-profiles.test.ts
@@ -1,9 +1,24 @@
+import path from "path";
 import { describe, expect, test } from "vitest";
-import { MergedQualityDefinitionResource } from "./__generated__/mergedTypes";
-import { doAllQualitiesExist, isOrderOfQualitiesEqual, mapQualities } from "./quality-profiles";
-import { ConfigQualityProfile, ConfigQualityProfileItem } from "./types/config.types";
+import { MergedCustomFormatResource, MergedQualityDefinitionResource, MergedQualityProfileResource } from "./__generated__/mergedTypes";
+import { calculateQualityProfilesDiff, doAllQualitiesExist, isOrderOfQualitiesEqual, mapQualities } from "./quality-profiles";
+import { CFProcessing } from "./types/common.types";
+import { ConfigQualityProfile, ConfigQualityProfileItem, MergedConfigInstance } from "./types/config.types";
+import { cloneWithJSON, loadJsonFile } from "./util";
 
 describe("QualityProfiles", async () => {
+  const sampleQualityProfile = loadJsonFile<MergedQualityProfileResource>(
+    path.resolve(__dirname, `../tests/samples/single_quality_profile.json`),
+  );
+
+  const sampleQualityDefinitions = loadJsonFile<MergedQualityDefinitionResource[]>(
+    path.resolve(__dirname, `../tests/samples/qualityDefinition.json`),
+  );
+
+  const sampleCustomFormat = loadJsonFile<MergedCustomFormatResource>(
+    path.resolve(__dirname, `../tests/samples/single_custom_format.json`),
+  );
+
   test("doAllQualitiesExist - all exist", async ({}) => {
     const fromConfig: ConfigQualityProfileItem[] = [
       { name: "WEB 1080p", qualities: ["WEBDL-1080p", "WEBRip-1080p"] },
@@ -184,12 +199,111 @@ describe("QualityProfiles", async () => {
     expect(result[2]!.allowed).toBe(true);
   });
 
-  test("calculateQualityProfilesDiff - should diff if minUpgradeFormatScore is different", async ({}) => {
-    // TODO
+  test("calculateQualityProfilesDiff - should diff if minUpgradeFormatScore / minFormatScore is different", async ({}) => {
+    const cfMap: CFProcessing = { carrIdMapping: new Map(), cfNameToCarrConfig: new Map() };
+
+    const fromConfig: ConfigQualityProfileItem[] = [{ name: "HDTV-1080p", enabled: false }];
+
+    const resources: MergedQualityDefinitionResource[] = [
+      { id: 1, title: "HDTV-1080p", weight: 2, quality: { id: 1, name: "HDTV-1080p" } },
+    ];
+
+    const profile: ConfigQualityProfile = {
+      name: "hi",
+      min_format_score: 2,
+      qualities: fromConfig,
+      quality_sort: "sort",
+      upgrade: { allowed: true, until_quality: "HDTV-1080p", until_score: 1000 },
+      score_set: "default",
+    };
+
+    const config: MergedConfigInstance = {
+      custom_formats: [],
+      quality_profiles: [profile],
+      customFormatDefinitions: [],
+      media_management: {},
+      media_naming: {},
+    };
+
+    const serverProfile = cloneWithJSON(sampleQualityProfile);
+    serverProfile.name = "hi";
+    serverProfile.formatItems = [];
+    serverProfile.minUpgradeFormatScore = 3;
+    serverProfile.minFormatScore = 3;
+    serverProfile.cutoff = 1;
+    serverProfile.items = [{ allowed: false, items: [], quality: { id: 1, name: "HDTV-1080p" } }];
+
+    const serverQP: MergedQualityProfileResource[] = [serverProfile];
+    const serverQD: MergedQualityDefinitionResource[] = resources;
+    const serverCF: MergedCustomFormatResource[] = [cloneWithJSON(sampleCustomFormat)];
+
+    let diff = await calculateQualityProfilesDiff(cfMap, config, serverQP, serverQD, serverCF);
+    expect(diff.changedQPs.length).toBe(1);
+    expect(diff.create.length).toBe(0);
+    expect(diff.noChanges.length).toBe(0);
+
+    serverProfile.minFormatScore = 0;
+    diff = await calculateQualityProfilesDiff(cfMap, config, serverQP, serverQD, serverCF);
+    expect(diff.changedQPs.length).toBe(1);
+    expect(diff.create.length).toBe(0);
+    expect(diff.noChanges.length).toBe(0);
+
+    serverProfile.minUpgradeFormatScore = 0;
+    diff = await calculateQualityProfilesDiff(cfMap, config, serverQP, serverQD, serverCF);
+    expect(diff.changedQPs.length).toBe(1);
+    expect(diff.create.length).toBe(0);
+    expect(diff.noChanges.length).toBe(0);
+
+    profile.min_format_score = 0;
+    serverProfile.minFormatScore = 1;
+    diff = await calculateQualityProfilesDiff(cfMap, config, serverQP, serverQD, serverCF);
+    expect(diff.changedQPs.length).toBe(1);
+    expect(diff.create.length).toBe(0);
+    expect(diff.noChanges.length).toBe(0);
   });
 
-  test("calculateQualityProfilesDiff - should not diff if minUpgradeFormatScore is equal", async ({}) => {
-    // TODO
+  test("calculateQualityProfilesDiff - should not diff if minFormatScore is equal", async ({}) => {
+    const cfMap: CFProcessing = { carrIdMapping: new Map(), cfNameToCarrConfig: new Map() };
+
+    const fromConfig: ConfigQualityProfileItem[] = [{ name: "HDTV-1080p", enabled: false }];
+
+    const resources: MergedQualityDefinitionResource[] = [
+      { id: 1, title: "HDTV-1080p", weight: 2, quality: { id: 1, name: "HDTV-1080p" } },
+    ];
+
+    const profile: ConfigQualityProfile = {
+      name: "hi",
+      min_format_score: 2,
+      qualities: fromConfig,
+      quality_sort: "sort",
+      upgrade: { allowed: true, until_quality: "HDTV-1080p", until_score: 1000 },
+      score_set: "default",
+    };
+
+    const config: MergedConfigInstance = {
+      custom_formats: [],
+      quality_profiles: [profile],
+      customFormatDefinitions: [],
+      media_management: {},
+      media_naming: {},
+    };
+
+    const serverProfile = cloneWithJSON(sampleQualityProfile);
+    serverProfile.name = "hi";
+    serverProfile.formatItems = [];
+    serverProfile.minUpgradeFormatScore = 3;
+    serverProfile.minFormatScore = 2;
+    serverProfile.cutoff = 1;
+    serverProfile.items = [{ allowed: false, items: [], quality: { id: 1, name: "HDTV-1080p" } }];
+
+    const serverQP: MergedQualityProfileResource[] = [serverProfile];
+    const serverQD: MergedQualityDefinitionResource[] = resources;
+    const serverCF: MergedCustomFormatResource[] = [cloneWithJSON(sampleCustomFormat)];
+
+    const diff = await calculateQualityProfilesDiff(cfMap, config, serverQP, serverQD, serverCF);
+    expect(diff.changedQPs.length).toBe(0);
+    expect(diff.create.length).toBe(0);
+    expect(diff.noChanges.length).toBe(1);
   });
 
   test("calculateQualityProfilesDiff - should not diff if minUpgradeFormatScore is not configured", async ({}) => {
diff --git a/src/quality-profiles.ts b/src/quality-profiles.ts
index 65ae3a4..52eb73a 100644
--- a/src/quality-profiles.ts
+++ b/src/quality-profiles.ts
@@ -186,7 +186,7 @@ export const doAllQualitiesExist = (serverResource: ConfigQualityProfileItem[],
   const sortedServerConfig = serverCloned.sort((a, b) => (a.name < b.name ? -1 : 1));
   const sortedLocalConfig = localCloned.sort((a, b) => (a.name < b.name ? -1 : 1));
 
-  if (sortedLocalConfig.length !== sortedServerConfig.length) {
+  if (sortedLocalConfig.length !== sortedServerConfig.length || sortedLocalConfig.length === 0) {
     return false;
   }
 
@@ -256,7 +256,7 @@ export const calculateQualityProfilesDiff = async (
         return p;
       }, new Map()) ?? new Map();
 
-    if (!serverMatch) {
+    if (serverMatch == null) {
       logger.info(`QualityProfile '${name}' not found in server. Will be created.`);
       const mappedQ = mapQualities(serverQD, value);
 
@@ -350,10 +350,10 @@ export const calculateQualityProfilesDiff = async (
 
     // TODO do we want to enforce the whole structure or only match those which are enabled by us?
     if (!doAllQualitiesExist(serverQualitiesMapped, value.qualities)) {
-      logger.info(`QualityProfile items mismatch will update whole array`);
+      logger.info(`QualityProfile qualities mismatch will update whole array`);
       diffExist = true;
 
-      changeList.push(`QualityProfile items do not match`);
+      changeList.push(`QualityProfile qualities mismatch will update whole array`);
       updatedServerObject.items = mapQualities(serverQD, value);
     } else {
       if (!isOrderOfQualitiesEqual(value.qualities, serverQualitiesMapped.toReversed())) {
@@ -378,7 +378,7 @@ export const calculateQualityProfilesDiff = async (
       return p;
     }, new Map());
 
-    if (value.min_format_score) {
+    if (value.min_format_score != null) {
       if (serverMatch.minFormatScore !== value.min_format_score) {
         updatedServerObject.minFormatScore = value.min_format_score;
         diffExist = true;
@@ -386,7 +386,7 @@ export const calculateQualityProfilesDiff = async (
       }
     }
 
-    if (value.upgrade) {
+    if (value.upgrade != null) {
       if (serverMatch.upgradeAllowed !== value.upgrade.allowed) {
         updatedServerObject.upgradeAllowed = value.upgrade.allowed;
         diffExist = true;
@@ -396,7 +396,7 @@ export const calculateQualityProfilesDiff = async (
 
       const upgradeUntil = qualityToId.get(value.upgrade.until_quality);
 
-      if (!upgradeUntil) {
+      if (upgradeUntil == null) {
         throw new Error(`Did not find expected Quality to upgrade until: ${value.upgrade.until_quality}`);
       }
 
@@ -431,7 +431,7 @@ export const calculateQualityProfilesDiff = async (
 
     let scoringDiff = false;
 
-    if (scoringForQP) {
+    if (scoringForQP != null) {
       const newCFFormats: MergedProfileFormatItemResource[] = [];
 
       for (const [scoreKey, scoreValue] of scoringForQP.entries()) {
@@ -477,7 +477,7 @@ export const calculateQualityProfilesDiff = async (
 
       updatedServerObject.formatItems = newCFFormats;
     } else {
-      logger.info(`No scoring for QualityProfile ${serverMatch.name!} found`);
+      logger.info(`No scoring for QualityProfile '${serverMatch.name!}' found`);
     }
 
     logger.debug(
diff --git a/tests/samples/single_custom_format.json b/tests/samples/single_custom_format.json
new file mode 100644
index 0000000..7a8d294
--- /dev/null
+++ b/tests/samples/single_custom_format.json
@@ -0,0 +1,28 @@
+{
+  "id": 1,
+  "name": "BR-DISK",
+  "includeCustomFormatWhenRenaming": false,
+  "specifications": [
+    {
+      "name": "BR-DISK",
+      "implementation": "ReleaseTitleSpecification",
+      "implementationName": "Release Title",
+      "infoLink": "https://wiki.servarr.com/sonarr/settings#custom-formats-2",
+      "negate": false,
+      "required": true,
+      "fields": [
+        {
+          "order": 0,
+          "name": "value",
+          "label": "Regular Expression",
+          "helpText": "Custom Format RegEx is Case Insensitive",
+          "value": "^(?!.*\\b((?<!HD[._ -]|HD)DVD|BDRip|720p|MKV|XviD|WMV|d3g|(BD)?REMUX|^(?=.*1080p)(?=.*HEVC)|[xh][-_. ]?26[45]|German.*[DM]L|((?<=\\d{4}).*German.*([DM]L)?)(?=.*\\b(AVC|HEVC|VC[-_. ]?1|MVC|MPEG[-_. ]?2)\\b))\\b)(((?=.*\\b(Blu[-_. ]?ray|BD|HD[-_. ]?DVD)\\b)(?=.*\\b(AVC|HEVC|VC[-_. ]?1|MVC|MPEG[-_. ]?2|BDMV|ISO)\\b))|^((?=.*\\b(((?=.*\\b((.*_)?COMPLETE.*|Dis[ck])\\b)(?=.*(Blu[-_. ]?ray|HD[-_. ]?DVD)))|3D[-_. ]?BD|BR[-_. ]?DISK|Full[-_. ]?Blu[-_. ]?ray|^((?=.*((BD|UHD)[-_. ]?(25|50|66|100|ISO)))))))).*",
+          "type": "textbox",
+          "advanced": false,
+          "privacy": "normal",
+          "isFloat": false
+        }
+      ]
+    }
+  ]
+}
diff --git a/tests/samples/single_quality_profile.json b/tests/samples/single_quality_profile.json
new file mode 100644
index 0000000..8f4b289
--- /dev/null
+++ b/tests/samples/single_quality_profile.json
@@ -0,0 +1,249 @@
+{
+  "name": "TestProfile",
+  "upgradeAllowed": true,
+  "cutoff": 1003,
+  "items": [
+    {
+      "quality": {
+        "id": 0,
+        "name": "Unknown",
+        "source": "unknown",
+        "resolution": 0
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "quality": {
+        "id": 1,
+        "name": "SDTV",
+        "source": "television",
+        "resolution": 480
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "name": "WEB 480p",
+      "items": [
+        {
+          "quality": {
+            "id": 12,
+            "name": "WEBRip-480p",
+            "source": "webRip",
+            "resolution": 480
+          },
+          "items": [],
+          "allowed": false
+        },
+        {
+          "quality": {
+            "id": 8,
+            "name": "WEBDL-480p",
+            "source": "web",
+            "resolution": 480
+          },
+          "items": [],
+          "allowed": false
+        }
+      ],
+      "allowed": false,
+      "id": 1000
+    },
+    {
+      "quality": {
+        "id": 2,
+        "name": "DVD",
+        "source": "dvd",
+        "resolution": 480
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "quality": {
+        "id": 13,
+        "name": "Bluray-480p",
+        "source": "bluray",
+        "resolution": 480
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "quality": {
+        "id": 10,
+        "name": "Raw-HD",
+        "source": "televisionRaw",
+        "resolution": 1080
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "quality": {
+        "id": 6,
+        "name": "Bluray-720p",
+        "source": "bluray",
+        "resolution": 720
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "quality": {
+        "id": 7,
+        "name": "Bluray-1080p",
+        "source": "bluray",
+        "resolution": 1080
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "quality": {
+        "id": 20,
+        "name": "Bluray-1080p Remux",
+        "source": "blurayRaw",
+        "resolution": 1080
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "quality": {
+        "id": 19,
+        "name": "Bluray-2160p",
+        "source": "bluray",
+        "resolution": 2160
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "quality": {
+        "id": 21,
+        "name": "Bluray-2160p Remux",
+        "source": "blurayRaw",
+        "resolution": 2160
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "name": "WEB 720p",
+      "items": [
+        {
+          "quality": {
+            "id": 4,
+            "name": "HDTV-720p",
+            "source": "television",
+            "resolution": 720
+          },
+          "items": [],
+          "allowed": false
+        },
+        {
+          "quality": {
+            "id": 14,
+            "name": "WEBRip-720p",
+            "source": "webRip",
+            "resolution": 720
+          },
+          "items": [],
+          "allowed": false
+        },
+        {
+          "quality": {
+            "id": 5,
+            "name": "WEBDL-720p",
+            "source": "web",
+            "resolution": 720
+          },
+          "items": [],
+          "allowed": false
+        }
+      ],
+      "allowed": false,
+      "id": 1001
+    },
+    {
+      "name": "WEB 1080p",
+      "items": [
+        {
+          "quality": {
+            "id": 9,
+            "name": "HDTV-1080p",
+            "source": "television",
+            "resolution": 1080
+          },
+          "items": [],
+          "allowed": false
+        },
+        {
+          "quality": {
+            "id": 15,
+            "name": "WEBRip-1080p",
+            "source": "webRip",
+            "resolution": 1080
+          },
+          "items": [],
+          "allowed": false
+        },
+        {
+          "quality": {
+            "id": 3,
+            "name": "WEBDL-1080p",
+            "source": "web",
+            "resolution": 1080
+          },
+          "items": [],
+          "allowed": false
+        }
+      ],
+      "allowed": false,
+      "id": 1002
+    },
+    {
+      "quality": {
+        "id": 16,
+        "name": "HDTV-2160p",
+        "source": "television",
+        "resolution": 2160
+      },
+      "items": [],
+      "allowed": false
+    },
+    {
+      "name": "WEB 2160p",
+      "items": [
+        {
+          "quality": {
+            "id": 17,
+            "name": "WEBRip-2160p",
+            "source": "webRip",
+            "resolution": 2160
+          },
+          "items": [],
+          "allowed": true
+        },
+        {
+          "quality": {
+            "id": 18,
+            "name": "WEBDL-2160p",
+            "source": "web",
+            "resolution": 2160
+          },
+          "items": [],
+          "allowed": true
+        }
+      ],
+      "allowed": true,
+      "id": 1003
+    }
+  ],
+  "minFormatScore": 0,
+  "cutoffFormatScore": 1000,
+  "formatItems": [],
+  "id": 1000
+}