fix: create valid poms when using eslint styleguides

(and enable the missed and disabled xo test in maven part)

Author: simschla

plugin-maven/src/test/java/com/diffplug/spotless/maven/typescript/TypescriptFormatStepTest.java

@@ -19,7 +19,6 @@
 
 import java.io.IOException;
 
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import com.diffplug.spotless.ProcessRunner;
@@ -211,7 +210,6 @@ void eslintStyleguideStandardWithTypescript() throws Exception {
 	}
 
 	@Test
-	@Disabled("https://github.com/diffplug/spotless/issues/1756")
 	void eslintStyleguideXo() throws Exception {
 		writePomWithTypescriptSteps(
 				TEST_FILE_PATH,

testlib/src/main/java/com/diffplug/spotless/npm/EslintStyleGuide.java

@@ -115,8 +115,8 @@ public String asGradleMapStringMergedWith(Map<String, String> devDependencies) {
 
 	public String asMavenXmlStringMergedWith(Map<String, String> devDependencies) {
 		return mergedWith(devDependencies).entrySet().stream()
-				.map(entry -> "<" + entry.getKey() + ">" + entry.getValue() + "</" + entry.getKey() + ">")
-				.collect(Collectors.joining("", "<devDependencies>", "</devDependencies>"));
+				.map(entry -> String.format("<property><name>%s</name><value>%s</value></property>", entry.getKey(), entry.getValue()))
+				.collect(Collectors.joining("", "<devDependencyProperties>", "</devDependencyProperties>"));
 	}
 
 }