eslint: also test custom devDependencies case

Author: simschla

plugin-maven/src/test/java/com/diffplug/spotless/maven/javascript/JavascriptFormatStepTest.java

@@ -107,5 +107,29 @@ void eslintJsStyleguideUsingInlineConfig(String styleGuide) throws Exception {
 			mavenRunner().withArguments("spotless:apply").runNoError();
 			assertFile(TEST_FILE_PATH).sameAsResource(styleGuidePath + "/javascript-es6.clean");
 		}
+
+		@Test
+		void provideCustomDependenciesForStyleguideStandard() throws Exception {
+			final String styleGuidePath = "npm/eslint/javascript/styleguide/standard";
+
+			writePomWithJavascriptSteps(
+				TEST_FILE_PATH,
+				"<eslint>",
+				"  <configFile>.eslintrc.js</configFile>",
+				"  <devDependencies>",
+				"    <eslint>8.28.0</eslint>",
+				"    <eslint-config-standard>17.0.0</eslint-config-standard>",
+				"    <eslint-plugin-import>2.26.0</eslint-plugin-import>",
+				"    <eslint-plugin-n>15.6.0</eslint-plugin-n>",
+				"    <eslint-plugin-promise>6.1.1</eslint-plugin-promise>",
+				"  </devDependencies>",
+				"</eslint>");
+			setFile(".eslintrc.js").toResource(styleGuidePath + "/.eslintrc.js");
+
+			setFile(TEST_FILE_PATH).toResource(styleGuidePath + "/javascript-es6.dirty");
+
+			mavenRunner().withArguments("spotless:apply").runNoError();
+			assertFile(TEST_FILE_PATH).sameAsResource(styleGuidePath + "/javascript-es6.clean");
+		}
 	}
 }