Examples: Add error-prone example

examples/pom.xml

@@ -103,6 +103,31 @@
             <version>1.10.2</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>error_prone_check_api</artifactId>
+            <version>2.2.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>error_prone_test_helpers</artifactId>
+            <version>2.2.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>error_prone_core</artifactId>
+            <version>2.2.0</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <!-- Forced override -->
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>24.1-jre</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
     <build>

examples/src/test/java/edu/berkeley/cs/jqf/examples/errorprone/CompilerTest.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright (c) 2018, The Regents of the University of California
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package edu.berkeley.cs.jqf.examples.errorprone;
+
+import java.io.BufferedWriter;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+import com.google.errorprone.ErrorProneCompiler;
+import com.google.errorprone.bugpatterns.BugChecker;
+import com.google.errorprone.bugpatterns.EqualsHashCode;
+import com.pholser.junit.quickcheck.From;
+import com.sun.tools.javac.main.Main;
+import edu.berkeley.cs.jqf.examples.common.AsciiStringGenerator;
+import edu.berkeley.cs.jqf.fuzz.Fuzz;
+import edu.berkeley.cs.jqf.fuzz.JQF;
+import org.junit.Assert;
+import org.junit.Assume;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static com.sun.tools.javac.main.Main.Result.*;
+
+/**
+ * @author Rohan Padhye
+ */
+@RunWith(JQF.class)
+public class CompilerTest {
+
+    private Class<? extends BugChecker> bugCheckerClass = EqualsHashCode.class;
+    private ErrorProneCompiler compiler;
+    private final String[] args = {
+            "-encoding", "UTF-8",
+            "-XDdev",
+            "-parameters",
+            "-XDcompilePolicy=simple",
+            "-proc:none"
+    };
+
+
+    private File writeToFile(String data) throws IOException {
+        Path tmpDir = Files.createTempDirectory("errorprone-fuzz");
+        Path javaFile = tmpDir.resolve("Test.java");
+
+        try (BufferedWriter out = Files.newBufferedWriter(javaFile)) {
+            out.write(data);
+        }
+
+        return javaFile.toFile();
+    }
+
+    @Fuzz
+    public void testWithString(@From(AsciiStringGenerator.class) String classBody) {
+        // Construct test class with provided body
+        String code = String.format("class Test { %s }", classBody);
+        File javaFile;
+        try {
+            javaFile = writeToFile(code);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+
+        // Compile using javac + error-prone
+        Main.Result result = ErrorProneCompiler.compile(new String[]{ javaFile.getAbsolutePath()},
+                new PrintWriter(new ByteArrayOutputStream( )));
+
+        // Ensure that there was no issue with test command or environment
+        Assert.assertFalse(result == CMDERR);
+        Assert.assertFalse(result == SYSERR);
+
+        // Ignore compilation errors (only semantically valid inputs will pass)
+        Assume.assumeFalse(result == ERROR);
+
+        // This is the main test criteria -- abnormal exits are bugs
+        Assert.assertFalse( result == ABNORMAL);
+
+    }
+
+    @Test
+    public void test() {
+        testWithString("{ System.out.println(0); }");
+    }
+}