Add integration test for ToolProvider implementation

sormuras · sormuras · commit 82130f3bb3b4 · 2021-08-26T22:24:05.000+02:00
diff --git a/core/src/main/java/com/google/googlejavaformat/java/GoogleJavaFormatToolProvider.java b/core/src/main/java/com/google/googlejavaformat/java/GoogleJavaFormatToolProvider.java
@@ -3,9 +3,10 @@
 import java.io.PrintWriter;
 import java.util.spi.ToolProvider;
 
-public class FormatToolProvider implements ToolProvider {
+/** Provide a way to be invoked without necessarily starting a new VM. */
+public class GoogleJavaFormatToolProvider implements ToolProvider {
   public String name() {
-    return "format";
+    return "google-java-format";
   }
 
   public int run(PrintWriter out, PrintWriter err, String... args) {
diff --git a/core/src/main/resources/META-INF/services/java.util.spi.ToolProvider b/core/src/main/resources/META-INF/services/java.util.spi.ToolProvider
@@ -1 +1 @@
-com.google.googlejavaformat.java.FormatToolProvider
+com.google.googlejavaformat.java.GoogleJavaFormatToolProvider
diff --git a/core/src/test/java/com/google/googlejavaformat/java/GoogleJavaFormatToolProviderTest.java b/core/src/test/java/com/google/googlejavaformat/java/GoogleJavaFormatToolProviderTest.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2021 Google Inc.
+ *
+ * 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
+ *
+ *     http://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.
+ */
+
+package com.google.googlejavaformat.java;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.util.ServiceLoader;
+import java.util.spi.ToolProvider;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Tests for {@link GoogleJavaFormatToolProvider}. */
+@RunWith(JUnit4.class)
+public class GoogleJavaFormatToolProviderTest {
+
+  @Test
+  public void testUsageOutputAfterLoadingViaToolName() {
+    String name = "google-java-format";
+
+    ToolProvider format =
+        ServiceLoader.load(ToolProvider.class).stream()
+            .map(ServiceLoader.Provider::get)
+            .filter(provider -> provider.name().equals(name))
+            .findAny()
+            .orElseThrow(() -> new AssertionError("Tool not found by name: " + name));
+
+    StringWriter out = new StringWriter();
+    StringWriter err = new StringWriter();
+
+    int result = format.run(new PrintWriter(out, true), new PrintWriter(err, true), "--help");
+
+    assertThat(result).isEqualTo(0);
+
+    String usage = err.toString();
+
+    // Check that doc links are included.
+    assertThat(usage).contains("https://github.com/google/google-java-format");
+    assertThat(usage).contains("Usage: google-java-format");
+  }
+}

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-com.google.googlejavaformat.java.FormatToolProvider`
	`1`	`+com.google.googlejavaformat.java.GoogleJavaFormatToolProvider`