[tests] Add check that we are not missing classes for analysis

Test ensures issue with aux path fix in 4.7.3.1 does not resurface.  Confirmed this test will fail with usage of 4.7.3.1 but is fixed now on latest.

src/it/check-no-missing-classes/invoker.properties

@@ -0,0 +1,4 @@
+invoker.goals = clean compile spotbugs:check
+
+# The expected result of the build, possible values are "success" (default) and "failure"
+invoker.buildResult = success

src/it/check-no-missing-classes/pom.xml

@@ -0,0 +1,70 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+    Copyright (C) 2006-2020 the original author or authors.
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+        https://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <!-- Parent is disabled on purpose
+  <parent>
+    <groupId>spotbugs-maven-plugin.it</groupId>
+    <artifactId>common</artifactId>
+    <version>testing</version>
+    <relativePath>../common.xml</relativePath>
+  </parent>
+  -->
+  <groupId>spotbugs-maven-plugin.it</groupId>
+  <artifactId>check-no-missing-classes</artifactId>
+  <version>testing</version>
+  <name>check-no-missing-classes</name>
+  <packaging>jar</packaging>
+  <dependencies>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <version>@junitVersion@</version>
+    </dependency>
+  </dependencies>
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>com.github.spotbugs</groupId>
+        <artifactId>spotbugs-maven-plugin</artifactId>
+        <version>@pom.version@</version>
+        <configuration>
+          <xmlOutput>true</xmlOutput>
+          <failOnError>false</failOnError>
+          <debug>@spotbugsTestDebug@</debug>
+          <threshold>High</threshold>
+        </configuration>
+        <executions>
+          <execution>
+            <id>run-analysis</id>
+            <phase>process-classes</phase>
+            <goals>
+              <goal>spotbugs</goal>
+            </goals>
+          </execution>
+          <execution>
+            <id>process-results</id>
+            <goals>
+              <goal>verify</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>

src/it/check-no-missing-classes/src/main/java/test/App.java

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+package test;
+
+import org.junit.jupiter.api.Assertions;
+
+/**
+ * Hello world!
+ */
+public class App {
+
+    public static void main( String[] args ) {
+        Assertions.assertNull(args);
+        System.out.println( "Hello World!" );
+    }
+}

src/it/check-no-missing-classes/verify.groovy

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2006-2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Check no missing classes
+
+File buildLog = new File( basedir, 'build.log' )
+assert !buildLog.text.contains( 'The following classes needed for analysis were missing' ) 
+