refactor: Fix exec utils coverage (#23018)

lib/util/exec/docker/index.ts

@@ -59,7 +59,7 @@ function volumesEql(x: VolumesPair, y: VolumesPair): boolean {
   return xFrom === yFrom && xTo === yTo;
 }
 
-function prepareVolumes(volumes: VolumeOption[] = []): string[] {
+function prepareVolumes(volumes: VolumeOption[]): string[] {
   const expanded: (VolumesPair | null)[] = volumes.map(expandVolumeOption);
   const filtered: VolumesPair[] = expanded.filter(
     (vol): vol is VolumesPair => vol !== null

lib/util/exec/hermit.spec.ts

-import os from 'node:os';
+import { codeBlock } from 'common-tags';
 import _findUp from 'find-up';
 import upath from 'upath';
 import { mockExecAll } from '../../../test/exec-util';
@@ -62,11 +62,10 @@ describe('util/exec/hermit', () => {
     it('should return hermit environment variables when hermit env returns successfully', async () => {
       findUp.mockResolvedValueOnce(upath.join(localDir, 'bin/hermit'));
       mockExecAll({
-        stdout:
-          [
-            'GOBIN=/usr/src/app/repository-a/.hermit/go/bin',
-            'PATH=/usr/src/app/repository-a/bin',
-          ].join(os.EOL) + os.EOL,
+        stdout: codeBlock`
+          GOBIN=/usr/src/app/repository-a/.hermit/go/bin
+          PATH=/usr/src/app/repository-a/bin
+        `,
         stderr: '',
       });
 

lib/util/exec/hermit.ts

-import os from 'node:os';
 import upath from 'upath';
 import { GlobalConfig } from '../../config/global';
 import { logger } from '../../logger';
 import { findUpLocal } from '../fs';
+import { newlineRegex } from '../regex';
 import { rawExec } from './common';
 import type { RawExecOptions } from './types';
 
@@ -24,7 +24,7 @@ export async function findHermitCwd(cwd: string): Promise<string> {
 export async function getHermitEnvs(
   rawOptions: RawExecOptions
 ): Promise<Record<string, string>> {
-  const cwd = rawOptions.cwd ?? '';
+  const cwd = rawOptions.cwd ?? /* istanbul ignore next */ '';
   const hermitCwd = await findHermitCwd(cwd);
   logger.debug({ cwd, hermitCwd }, 'fetching hermit environment variables');
   // with -r will output the raw unquoted environment variables to consume
@@ -33,18 +33,16 @@ export async function getHermitEnvs(
     cwd: hermitCwd,
   });
 
-  const lines = hermitEnvResp.stdout.split(os.EOL);
-
   const out: Record<string, string> = {};
 
+  const lines = hermitEnvResp.stdout
+    .split(newlineRegex)
+    .map((line) => line.trim())
+    .filter((line) => line.includes('='));
   for (const line of lines) {
-    const trimmedLine = line.trim();
-    if (trimmedLine === '') {
-      continue;
-    }
-    const equalIndex = trimmedLine.indexOf('=');
-    const name = trimmedLine.substring(0, equalIndex);
-    out[name] = trimmedLine.substring(equalIndex + 1);
+    const equalIndex = line.indexOf('=');
+    const name = line.substring(0, equalIndex);
+    out[name] = line.substring(equalIndex + 1);
   }
 
   return out;

lib/util/exec/index.spec.ts

@@ -20,7 +20,7 @@ jest.mock('../../modules/datasource');
 interface TestInput {
   processEnv: Record<string, string>;
   inCmd: string | string[];
-  inOpts: ExecOptions;
+  inOpts?: ExecOptions;
   outCmd: string[];
   outOpts: RawExecOptions[];
   adminConfig?: Partial<RepoGlobalConfig>;
@@ -106,6 +106,25 @@ describe('util/exec/index', () => {
       },
     ],
 
+    [
+      'Command without options',
+      {
+        processEnv,
+        inCmd,
+        inOpts: undefined,
+        outCmd,
+        outOpts: [
+          {
+            cwd,
+            encoding,
+            env: envMock.basic,
+            timeout: 900000,
+            maxBuffer: 10485760,
+          },
+        ],
+      },
+    ],
+
     [
       'Multiple commands',
       {