Yet another attempt to fix the broken test.

Author: nedtwigg

plugin-maven/src/test/java/com/diffplug/spotless/maven/MavenIntegrationHarness.java

@@ -115,7 +115,7 @@ protected void writePomWithKotlinSteps(String... steps) throws IOException {
 	}
 
 	protected void writePomWithCppSteps(String... steps) throws IOException {
-		writePom(groupWithSteps("cpp", including("**/*.c++")), steps);
+		writePom(groupWithSteps("cpp"), steps);
 	}
 
 	protected void writePomWithTypescriptSteps(String... steps) throws IOException {

plugin-maven/src/test/java/com/diffplug/spotless/maven/generic/LicenseHeaderTest.java

@@ -37,6 +37,7 @@ public void fromFileJava() throws Exception {
 	public void fromContentCpp() throws Exception {
 		String cppLicense = "//my license";
 		writePomWithCppSteps(
+				"<includes><include>src/**</include></includes>",
 				"<licenseHeader>",
 				"  <content>",
 				cppLicense,