diff --git a/docs/usage/self-hosted-configuration.md b/docs/usage/self-hosted-configuration.md
index 1294dfb24e589c668277a1e5483ece9503dfbc62..417301ffd9cdf4ea7f8f1d01c94a7d483633f33c 100644
--- a/docs/usage/self-hosted-configuration.md
+++ b/docs/usage/self-hosted-configuration.md
@@ -292,6 +292,17 @@ Like this:
 
 ## dryRun
 
+Use `dryRun` to preview the behavior of Renovate in logs, without making any changes to the repository files.
+
+You can choose from the following behaviors for the `dryRun` config option:
+
+- `null`: Default behavior - Performs a regular Renovate run including creating/updating/deleting branches and PRs
+- `"extract"`: Performs a very quick package file scan to identify the extracted dependencies
+- `"lookup"`: Performs a package file scan to identify the extracted dependencies and updates available
+- `"full"`: Performs a dry run by logging messages instead of creating/updating/deleting branches and PRs
+
+Information provided mainly in debug log level.
+
 ## endpoint
 
 ## executionTimeout
diff --git a/lib/config/options/index.ts b/lib/config/options/index.ts
index a28240c12eea6e4650064bfac0223e9201843c0e..e9474bc9d6f09c0719ecaf2f39982d1e27df29f0 100644
--- a/lib/config/options/index.ts
+++ b/lib/config/options/index.ts
@@ -245,9 +245,10 @@ const options: RenovateOptions[] = [
     name: 'dryRun',
     description:
       'If enabled, perform a dry run by logging messages instead of creating/updating/deleting branches and PRs.',
-    type: 'boolean',
+    type: 'string',
     globalOnly: true,
-    default: false,
+    allowedValues: ['extract', 'lookup', 'full'],
+    default: null,
   },
   {
     name: 'printConfig',
diff --git a/lib/config/types.ts b/lib/config/types.ts
index 8c5a068ac3a6539c9ff31e5444bdef37042474a6..31b399b7931852ec93275d9095d234a3c444a597 100644
--- a/lib/config/types.ts
+++ b/lib/config/types.ts
@@ -11,6 +11,7 @@ export type RenovateConfigStage =
   | 'pr';
 
 export type RepositoryCacheConfig = 'disabled' | 'enabled' | 'reset';
+export type DryRunConfig = 'extract' | 'lookup' | 'full';
 
 export interface GroupConfig extends Record<string, unknown> {
   branchName?: string;
@@ -104,7 +105,7 @@ export interface RepoGlobalConfig {
   dockerChildPrefix?: string;
   dockerImagePrefix?: string;
   dockerUser?: string;
-  dryRun?: boolean;
+  dryRun?: DryRunConfig;
   executionTimeout?: number;
   exposeAllEnv?: boolean;
   migratePresets?: Record<string, string>;
diff --git a/lib/workers/global/config/parse/index.spec.ts b/lib/workers/global/config/parse/index.spec.ts
index 6142ce8f4032109353eb73b540b6adb500183f1b..ea9e5e39e3f326ff854814acd85b6e5ce0d6ac2b 100644
--- a/lib/workers/global/config/parse/index.spec.ts
+++ b/lib/workers/global/config/parse/index.spec.ts
@@ -135,5 +135,35 @@ describe('workers/global/config/parse/index', () => {
       const parsed = await configParser.parseConfigs(defaultEnv, defaultArgv);
       expect(parsed.hostRules).toContainEqual({ matchHost: 'example.org' });
     });
+
+    it('env dryRun = true replaced to full', async () => {
+      const env: NodeJS.ProcessEnv = {
+        ...defaultEnv,
+        RENOVATE_DRY_RUN: 'true',
+      };
+      const parsedConfig = await configParser.parseConfigs(env, defaultArgv);
+      expect(parsedConfig).toContainEntries([['dryRun', 'full']]);
+    });
+
+    it('cli dryRun = true replaced to full', async () => {
+      defaultArgv = defaultArgv.concat(['--dry-run=true']);
+      const parsed = await configParser.parseConfigs(defaultEnv, defaultArgv);
+      expect(parsed).toContainEntries([['dryRun', 'full']]);
+    });
+
+    it('env dryRun = false replaced to null', async () => {
+      const env: NodeJS.ProcessEnv = {
+        ...defaultEnv,
+        RENOVATE_DRY_RUN: 'false',
+      };
+      const parsedConfig = await configParser.parseConfigs(env, defaultArgv);
+      expect(parsedConfig).toContainEntries([['dryRun', null]]);
+    });
+
+    it('cli dryRun = false replaced to null', async () => {
+      defaultArgv = defaultArgv.concat(['--dry-run=false']);
+      const parsed = await configParser.parseConfigs(defaultEnv, defaultArgv);
+      expect(parsed).toContainEntries([['dryRun', null]]);
+    });
   });
 });
diff --git a/lib/workers/global/config/parse/index.ts b/lib/workers/global/config/parse/index.ts
index 9f15970620ddb406580a1cf99ef489bd615ee6bf..379eb4ba0ca81b47b94db68b5a2b4ef896aaba92 100644
--- a/lib/workers/global/config/parse/index.ts
+++ b/lib/workers/global/config/parse/index.ts
@@ -22,6 +22,27 @@ export async function parseConfigs(
   const cliConfig = cliParser.getConfig(argv);
   const envConfig = envParser.getConfig(env);
 
+  if (cliConfig?.dryRun === 'true') {
+    logger.warn('cli config dryRun property has been changed to full');
+    cliConfig.dryRun = 'full';
+  }
+  if (envConfig?.dryRun === 'true') {
+    logger.warn('env config dryRun property has been changed to full');
+    envConfig.dryRun = 'full';
+  }
+  if (cliConfig?.dryRun === 'false' || cliConfig?.dryRun === 'null') {
+    logger.warn(
+      'cli config dryRun property has been changed to null, running with normal mode.'
+    );
+    cliConfig.dryRun = null;
+  }
+  if (envConfig?.dryRun === 'false' || envConfig?.dryRun === 'null') {
+    logger.warn(
+      'env config dryRun property has been changed to null, running with normal mode.'
+    );
+    envConfig.dryRun = null;
+  }
+
   let config: AllConfig = mergeChildConfig(fileConfig, envConfig);
   config = mergeChildConfig(config, cliConfig);
 
diff --git a/lib/workers/repository/dependency-dashboard.spec.ts b/lib/workers/repository/dependency-dashboard.spec.ts
index b2d2883d229d3a399312b8fabdb8d99db0c8a90a..c2875f54e6fb540c4c9a8b3587f5adbd35779bb5 100644
--- a/lib/workers/repository/dependency-dashboard.spec.ts
+++ b/lib/workers/repository/dependency-dashboard.spec.ts
@@ -32,7 +32,7 @@ async function dryRun(
   ensureIssueCalls = 0
 ) {
   jest.clearAllMocks();
-  GlobalConfig.set({ dryRun: true });
+  GlobalConfig.set({ dryRun: 'full' });
   await dependencyDashboard.ensureDependencyDashboard(config, branches);
   expect(platform.ensureIssueClosing).toHaveBeenCalledTimes(
     ensureIssueClosingCalls
diff --git a/lib/workers/repository/dependency-dashboard.ts b/lib/workers/repository/dependency-dashboard.ts
index b158de8771cf7e68eb1b67641dfc6476f394d6f0..a0ac0fcbc3945b8718358d5ddec8b7ec6787663c 100644
--- a/lib/workers/repository/dependency-dashboard.ts
+++ b/lib/workers/repository/dependency-dashboard.ts
@@ -350,7 +350,7 @@ export async function ensureDependencyDashboard(
       { title: config.dependencyDashboardTitle },
       'DRY-RUN: Would ensure Dependency Dashboard'
     );
-  } else {
+  } else if (!GlobalConfig.get('dryRun')) {
     await platform.ensureIssue({
       title: config.dependencyDashboardTitle,
       reuseTitle,
diff --git a/lib/workers/repository/error-config.spec.ts b/lib/workers/repository/error-config.spec.ts
index 2ee8c520445c4348b4ac76168470ea32553b7915..d662a41fc0a1c62b225c419492934299177c7b4a 100644
--- a/lib/workers/repository/error-config.spec.ts
+++ b/lib/workers/repository/error-config.spec.ts
@@ -32,7 +32,7 @@ describe('workers/repository/error-config', () => {
       error.validationSource = 'package.json';
       error.validationMessage = 'some-message';
       platform.ensureIssue.mockResolvedValueOnce('created');
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       const res = await raiseConfigWarningIssue(config, error);
       expect(res).toBeUndefined();
     });
@@ -57,7 +57,7 @@ describe('workers/repository/error-config', () => {
         number: 1,
         state: PrState.Open,
       });
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       const res = await raiseConfigWarningIssue(config, error);
       expect(res).toBeUndefined();
     });
diff --git a/lib/workers/repository/finalise/prune.spec.ts b/lib/workers/repository/finalise/prune.spec.ts
index 1374351bbc2bc1160ce9d67b5805d996ec13f7c2..7c73abdc2b41b8010c13d0b6b10866a86112ebc3 100644
--- a/lib/workers/repository/finalise/prune.spec.ts
+++ b/lib/workers/repository/finalise/prune.spec.ts
@@ -69,7 +69,7 @@ describe('workers/repository/finalise/prune', () => {
     });
     it('does nothing on dryRun', async () => {
       config.branchList = ['renovate/a', 'renovate/b'];
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       git.getBranchList.mockReturnValueOnce(
         config.branchList.concat(['renovate/c'])
       );
@@ -107,7 +107,7 @@ describe('workers/repository/finalise/prune', () => {
     });
     it('skips comment if dry run', async () => {
       config.branchList = ['renovate/a', 'renovate/b'];
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       git.getBranchList.mockReturnValueOnce(
         config.branchList.concat(['renovate/c'])
       );
@@ -122,7 +122,7 @@ describe('workers/repository/finalise/prune', () => {
     });
     it('dry run delete branch no PR', async () => {
       config.branchList = ['renovate/a', 'renovate/b'];
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       git.getBranchList.mockReturnValueOnce(
         config.branchList.concat(['renovate/c'])
       );
diff --git a/lib/workers/repository/index.ts b/lib/workers/repository/index.ts
index 2d40b8d46acd909e11118e2d621cfa0976c6b1ea..2e5c9095df5ea8aa0d2ae508050ef49f29301e98 100644
--- a/lib/workers/repository/index.ts
+++ b/lib/workers/repository/index.ts
@@ -42,23 +42,28 @@ export async function renovateRepository(
     const { branches, branchList, packageFiles } = await extractDependencies(
       config
     );
-    await ensureOnboardingPr(config, packageFiles, branches);
-    const res = await updateRepo(config, branches);
-    setMeta({ repository: config.repository });
-    addSplit('update');
-    await setBranchCache(branches);
-    if (res === 'automerged') {
-      if (canRetry) {
-        logger.info('Renovating repository again after automerge result');
-        const recursiveRes = await renovateRepository(repoConfig, false);
-        return recursiveRes;
+    if (
+      GlobalConfig.get('dryRun') !== 'lookup' &&
+      GlobalConfig.get('dryRun') !== 'extract'
+    ) {
+      await ensureOnboardingPr(config, packageFiles, branches);
+      const res = await updateRepo(config, branches);
+      setMeta({ repository: config.repository });
+      addSplit('update');
+      await setBranchCache(branches);
+      if (res === 'automerged') {
+        if (canRetry) {
+          logger.info('Renovating repository again after automerge result');
+          const recursiveRes = await renovateRepository(repoConfig, false);
+          return recursiveRes;
+        }
+        logger.debug(`Automerged but already retried once`);
+      } else {
+        await ensureDependencyDashboard(config, branches);
       }
-      logger.debug(`Automerged but already retried once`);
-    } else {
-      await ensureDependencyDashboard(config, branches);
+      await finaliseRepo(config, branchList);
+      repoResult = processResult(config, res);
     }
-    await finaliseRepo(config, branchList);
-    repoResult = processResult(config, res);
   } catch (err) /* istanbul ignore next */ {
     setMeta({ repository: config.repository });
     const errorRes = await handleError(config, err);
diff --git a/lib/workers/repository/onboarding/pr/index.spec.ts b/lib/workers/repository/onboarding/pr/index.spec.ts
index bb5c61bd4ac8afdbe07ae5aff5e50a1fa3df5e33..ba164bea0eabbb6141ffa4a2da99374d86ec7376 100644
--- a/lib/workers/repository/onboarding/pr/index.spec.ts
+++ b/lib/workers/repository/onboarding/pr/index.spec.ts
@@ -159,7 +159,7 @@ describe('workers/repository/onboarding/pr/index', () => {
       expect(platform.createPr).toHaveBeenCalledTimes(1);
     });
     it('dryrun of updates PR when modified', async () => {
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       config.baseBranch = 'some-branch';
       platform.getBranchPr.mockResolvedValueOnce(
         partial<Pr>({
@@ -178,7 +178,7 @@ describe('workers/repository/onboarding/pr/index', () => {
       );
     });
     it('dryrun of creates PR', async () => {
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       await ensureOnboardingPr(config, packageFiles, branches);
       expect(logger.info).toHaveBeenCalledWith(
         'DRY-RUN: Would check branch renovate/configure'
diff --git a/lib/workers/repository/process/index.spec.ts b/lib/workers/repository/process/index.spec.ts
index e23b46b05d2db1f421d1e97c1f82e55b254f0509..e9334fa48b21d359af3184b7b14d34e6087a177c 100644
--- a/lib/workers/repository/process/index.spec.ts
+++ b/lib/workers/repository/process/index.spec.ts
@@ -5,9 +5,11 @@ import {
   mocked,
   platform,
 } from '../../../../test/util';
+import { GlobalConfig } from '../../../config/global';
 import { CONFIG_VALIDATION } from '../../../constants/error-messages';
 import { getCache } from '../../../util/cache/repository';
 import * as _extractUpdate from './extract-update';
+import { lookup } from './extract-update';
 import { extractDependencies, updateRepo } from '.';
 
 jest.mock('../../../util/git');
@@ -98,5 +100,17 @@ describe('workers/repository/process/index', () => {
         CONFIG_VALIDATION
       );
     });
+    it('processes baseBranches dryRun extract', async () => {
+      extract.mockResolvedValue({} as never);
+      GlobalConfig.set({ dryRun: 'extract' });
+      const res = await extractDependencies(config);
+      await updateRepo(config, res.branches);
+      expect(res).toEqual({
+        branchList: [],
+        branches: [],
+        packageFiles: {},
+      });
+      expect(lookup).toHaveBeenCalledTimes(0);
+    });
   });
 });
diff --git a/lib/workers/repository/process/index.ts b/lib/workers/repository/process/index.ts
index 7b139ca13dec0838629b0479acaf92a84ecdc4e3..1c93822bad364aca003ade5d2a02980313ece1ae 100644
--- a/lib/workers/repository/process/index.ts
+++ b/lib/workers/repository/process/index.ts
@@ -1,4 +1,5 @@
 import { mergeChildConfig } from '../../../config';
+import { GlobalConfig } from '../../../config/global';
 import type { RenovateConfig } from '../../../config/types';
 import { CONFIG_VALIDATION } from '../../../constants/error-messages';
 import { logger } from '../../../logger';
@@ -103,6 +104,11 @@ export async function extractDependencies(
     logger.debug('No baseBranches');
     const packageFiles = await extract(config);
     addSplit('extract');
+    if (GlobalConfig.get('dryRun') === 'extract') {
+      res.packageFiles = packageFiles;
+      logger.info({ packageFiles }, 'Extracted dependencies');
+      return res;
+    }
     res = await lookup(config, packageFiles);
   }
   addSplit('lookup');
diff --git a/lib/workers/repository/process/write.spec.ts b/lib/workers/repository/process/write.spec.ts
index dbf1a90e9bd0ad6da8b439247aa90c96aa043632..f6056976f6d257ecee63144288454551bab596aa 100644
--- a/lib/workers/repository/process/write.spec.ts
+++ b/lib/workers/repository/process/write.spec.ts
@@ -1,4 +1,5 @@
 import { RenovateConfig, getConfig, git, mocked } from '../../../../test/util';
+import { GlobalConfig } from '../../../config/global';
 import { Limit, isLimitReached } from '../../global/limits';
 import { BranchConfig, BranchResult } from '../../types';
 import * as _branchWorker from '../update/branch';
@@ -48,6 +49,7 @@ describe('workers/repository/process/write', () => {
         branchExists: false,
         result: BranchResult.Automerged,
       });
+      GlobalConfig.set({ dryRun: 'full' });
       const res = await writeUpdates(config, branches);
       expect(res).toBe('automerged');
       expect(branchWorker.processBranch).toHaveBeenCalledTimes(4);
@@ -62,6 +64,7 @@ describe('workers/repository/process/write', () => {
       git.branchExists.mockReturnValueOnce(true);
       limits.getBranchesRemaining.mockResolvedValueOnce(1);
       expect(isLimitReached(Limit.Branches)).toBeFalse();
+      GlobalConfig.set({ dryRun: 'full' });
       await writeUpdates({ config }, branches);
       expect(isLimitReached(Limit.Branches)).toBeTrue();
     });
diff --git a/lib/workers/repository/update/branch/artifacts.spec.ts b/lib/workers/repository/update/branch/artifacts.spec.ts
index d46e36a34e195563154e137df1ef3d4ab1319cf5..fa02e8210debd8401335eea92e63b43d821d0b4b 100644
--- a/lib/workers/repository/update/branch/artifacts.spec.ts
+++ b/lib/workers/repository/update/branch/artifacts.spec.ts
@@ -31,7 +31,7 @@ describe('workers/repository/update/branch/artifacts', () => {
     });
 
     it('skips status (dry-run)', async () => {
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       platform.getBranchStatusCheck.mockResolvedValueOnce(null);
       await setArtifactErrorStatus(config);
       expect(platform.setBranchStatus).not.toHaveBeenCalled();
diff --git a/lib/workers/repository/update/branch/automerge.spec.ts b/lib/workers/repository/update/branch/automerge.spec.ts
index e2c14094ed541e4d16467f13b7b3150af4177cc1..12960dd87caf77efbedb771faad8507b66f8977d 100644
--- a/lib/workers/repository/update/branch/automerge.spec.ts
+++ b/lib/workers/repository/update/branch/automerge.spec.ts
@@ -63,7 +63,7 @@ describe('workers/repository/update/branch/automerge', () => {
     it('returns true if automerge succeeds (dry-run)', async () => {
       config.automerge = true;
       config.automergeType = 'branch';
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       platform.getBranchStatus.mockResolvedValueOnce(BranchStatus.green);
       expect(await tryBranchAutomerge(config)).toBe('automerged');
     });
diff --git a/lib/workers/repository/update/branch/commit.spec.ts b/lib/workers/repository/update/branch/commit.spec.ts
index 581bcef5531bb2b7334cfc127dc0dc1fd996372a..84d86767b80d0291981bc9706a7e63977c5b34ed 100644
--- a/lib/workers/repository/update/branch/commit.spec.ts
+++ b/lib/workers/repository/update/branch/commit.spec.ts
@@ -55,7 +55,7 @@ describe('workers/repository/update/branch/commit', () => {
       expect(platform.commitFiles.mock.calls).toMatchSnapshot();
     });
     it('dry runs', async () => {
-      GlobalConfig.set({ dryRun: true });
+      GlobalConfig.set({ dryRun: 'full' });
       config.updatedPackageFiles.push({
         type: 'addition',
         path: 'package.json',
diff --git a/lib/workers/repository/update/branch/index.spec.ts b/lib/workers/repository/update/branch/index.spec.ts
index 67cd04883cd9cb6ae6ea99100d5362d26e5cbf4f..eda3f7965440e0faf921bbdbb0dbf1c4f9be0ac9 100644
--- a/lib/workers/repository/update/branch/index.spec.ts
+++ b/lib/workers/repository/update/branch/index.spec.ts
@@ -487,7 +487,7 @@ describe('workers/repository/update/branch/index', () => {
       git.branchExists.mockReturnValue(true);
       commit.commitFilesToBranch.mockResolvedValueOnce(null);
       automerge.tryBranchAutomerge.mockResolvedValueOnce('automerged');
-      GlobalConfig.set({ ...adminConfig, dryRun: true });
+      GlobalConfig.set({ ...adminConfig, dryRun: 'full' });
       await branchWorker.processBranch(config);
       expect(automerge.tryBranchAutomerge).toHaveBeenCalledTimes(1);
       expect(prWorker.ensurePr).toHaveBeenCalledTimes(0);
@@ -831,7 +831,7 @@ describe('workers/repository/update/branch/index', () => {
       checkExisting.prAlreadyExisted.mockResolvedValueOnce({
         state: PrState.Closed,
       } as Pr);
-      GlobalConfig.set({ ...adminConfig, dryRun: true });
+      GlobalConfig.set({ ...adminConfig, dryRun: 'full' });
       expect(await branchWorker.processBranch(config)).toEqual({
         branchExists: false,
         prNo: undefined,
@@ -845,7 +845,7 @@ describe('workers/repository/update/branch/index', () => {
         state: PrState.Open,
       } as Pr);
       git.isBranchModified.mockResolvedValueOnce(true);
-      GlobalConfig.set({ ...adminConfig, dryRun: true });
+      GlobalConfig.set({ ...adminConfig, dryRun: 'full' });
       expect(await branchWorker.processBranch(config)).toEqual({
         branchExists: true,
         prNo: undefined,
@@ -871,7 +871,7 @@ describe('workers/repository/update/branch/index', () => {
       git.isBranchModified.mockResolvedValueOnce(true);
       schedule.isScheduledNow.mockReturnValueOnce(false);
       commit.commitFilesToBranch.mockResolvedValueOnce(null);
-      GlobalConfig.set({ ...adminConfig, dryRun: true });
+      GlobalConfig.set({ ...adminConfig, dryRun: 'full' });
       expect(
         await branchWorker.processBranch({
           ...config,
@@ -908,7 +908,7 @@ describe('workers/repository/update/branch/index', () => {
         pr: {},
       } as ResultWithPr);
       commit.commitFilesToBranch.mockResolvedValueOnce(null);
-      GlobalConfig.set({ ...adminConfig, dryRun: true });
+      GlobalConfig.set({ ...adminConfig, dryRun: 'full' });
       expect(
         await branchWorker.processBranch({
           ...config,
diff --git a/lib/workers/repository/update/pr/automerge.spec.ts b/lib/workers/repository/update/pr/automerge.spec.ts
index 7eda18fbc7d1066826292cb167e5a0370eefcfd9..29434ebfdc13923a074418113599a42f1e9d2f4a 100644
--- a/lib/workers/repository/update/pr/automerge.spec.ts
+++ b/lib/workers/repository/update/pr/automerge.spec.ts
@@ -1,4 +1,5 @@
 import { getConfig, git, mocked, partial } from '../../../../../test/util';
+import { GlobalConfig } from '../../../../config/global';
 import { Pr, platform as _platform } from '../../../../modules/platform';
 import { BranchStatus } from '../../../../types';
 import type { BranchConfig } from '../../../types';
@@ -105,5 +106,51 @@ describe('workers/repository/update/pr/automerge', () => {
       });
       expect(platform.mergePr).toHaveBeenCalledTimes(0);
     });
+    it('dryRun full should not automerge', async () => {
+      config.automerge = true;
+      GlobalConfig.set({ dryRun: 'full' });
+      platform.getBranchStatus.mockResolvedValueOnce(BranchStatus.green);
+      const res = await prAutomerge.checkAutoMerge(pr, config);
+      expect(res).toEqual({
+        automerged: false,
+        prAutomergeBlockReason: 'DryRun',
+      });
+      expect(platform.mergePr).toHaveBeenCalledTimes(0);
+    });
+    it('dryRun lookup should not automerge', async () => {
+      const expectedResult = {
+        automerged: false,
+        prAutomergeBlockReason: 'DryRun',
+      };
+      platform.getBranchStatus.mockResolvedValueOnce(BranchStatus.green);
+      GlobalConfig.set({ dryRun: 'lookup' });
+      const res = await prAutomerge.checkAutoMerge(pr, config);
+      expect(res).toEqual(expectedResult);
+      expect(platform.mergePr).toHaveBeenCalledTimes(0);
+    });
+    it('dryRun lookup pr-comment', async () => {
+      config.automergeType = 'pr-comment';
+      const expectedResult = {
+        automerged: false,
+        prAutomergeBlockReason: 'DryRun',
+      };
+      platform.getBranchStatus.mockResolvedValueOnce(BranchStatus.green);
+      GlobalConfig.set({ dryRun: 'lookup' });
+      const res = await prAutomerge.checkAutoMerge(pr, config);
+      expect(res).toEqual(expectedResult);
+      expect(platform.mergePr).toHaveBeenCalledTimes(0);
+    });
+    it('dryRun full pr-comment', async () => {
+      config.automergeType = 'pr-comment';
+      const expectedResult = {
+        automerged: false,
+        prAutomergeBlockReason: 'DryRun',
+      };
+      platform.getBranchStatus.mockResolvedValueOnce(BranchStatus.green);
+      GlobalConfig.set({ dryRun: 'full' });
+      const res = await prAutomerge.checkAutoMerge(pr, config);
+      expect(res).toEqual(expectedResult);
+      expect(platform.mergePr).toHaveBeenCalledTimes(0);
+    });
   });
 });