From ef082220c1121d89bfefe4decc77b56c75d7813b Mon Sep 17 00:00:00 2001
From: George Fraser <george@fivetran.com>
Date: Sun, 20 Jan 2019 19:06:30 -0800
Subject: Simple test for troubleshooting incremental compiler

---
 src/test/java/org/javacs/SimpleTest.java | 90 ++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 src/test/java/org/javacs/SimpleTest.java

diff --git a/src/test/java/org/javacs/SimpleTest.java b/src/test/java/org/javacs/SimpleTest.java
new file mode 100644
index 0000000..7f46eb7
--- /dev/null
+++ b/src/test/java/org/javacs/SimpleTest.java
@@ -0,0 +1,90 @@
+package org.javacs;
+
+import com.sun.source.util.JavacTask;
+import com.sun.source.util.TaskEvent;
+import com.sun.source.util.TaskListener;
+import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.*;
+import java.util.logging.Logger;
+import javax.tools.*;
+import org.junit.Before;
+import org.junit.Test;
+
+public class SimpleTest implements TaskListener, DiagnosticListener<JavaFileObject> {
+    final JavaCompiler compiler = ServiceLoader.load(JavaCompiler.class).iterator().next();
+    final Path src = Paths.get("src/main/java").toAbsolutePath();
+    final List<String> options = List.of("-sourcepath", src.toString(), "-verbose", "-proc:none");
+
+    @Before
+    public void setLogFormat() {
+        Main.setRootFormat();
+    }
+
+    @Test
+    public void standardFileManager() throws IOException {
+        var fileManager = compiler.getStandardFileManager(this, null, Charset.defaultCharset());
+
+        LOG.info("Compile once...");
+        var files = fileManager.getJavaFileObjects(src.resolve("org/javacs/JavaLanguageServer.java"));
+        var task = (JavacTask) compiler.getTask(null, fileManager, this, options, null, files);
+
+        task.addTaskListener(this);
+        task.analyze();
+
+        LOG.info("Compile twice...");
+        task = (JavacTask) compiler.getTask(null, fileManager, this, options, null, files);
+        task.addTaskListener(this);
+        task.analyze();
+    }
+
+    @Test
+    public void sourceFileManager() throws IOException {
+        FileStore.setWorkspaceRoots(Set.of(Paths.get(".").toAbsolutePath()));
+        var fileManager = new SourceFileManager();
+
+        LOG.info("Compile once...");
+        var files =
+                fileManager.getJavaFileObjectsFromFiles(
+                        List.of(src.resolve("org/javacs/JavaLanguageServer.java").toFile()));
+        var task = (JavacTask) compiler.getTask(null, fileManager, this, options, null, files);
+        task.addTaskListener(this);
+        task.analyze();
+        LOG.info("...finished once");
+
+        for (var i = 0; i < 3; i++) {
+            LOG.info(String.format("Compile again %d...", i));
+            task = (JavacTask) compiler.getTask(null, fileManager, this, options, null, files);
+            task.addTaskListener(this);
+            task.analyze();
+            LOG.info(String.format("...finished %d", i));
+        }
+    }
+
+    @Override
+    public void report(Diagnostic<? extends JavaFileObject> d) {
+        LOG.warning(d.getMessage(null));
+    }
+
+    @Override
+    public void started(TaskEvent e) {
+        if (e.getSourceFile() == null) {
+            LOG.info(String.format("...started %s", e.getKind()));
+            return;
+        }
+        LOG.info(String.format("...started %s %s", e.getKind(), e.getSourceFile().getName()));
+    }
+
+    @Override
+    public void finished(TaskEvent e) {
+        if (e.getSourceFile() == null) {
+            LOG.info(String.format("...finished %s", e.getKind()));
+            return;
+        }
+        LOG.info(String.format("...finished %s %s", e.getKind(), e.getSourceFile().getName()));
+    }
+
+    private static final Logger LOG = Logger.getLogger("main");
+}
-- 
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