testing: add TlsTesting.loadCert

testing/src/main/java/io/grpc/testing/TestUtils.java

@@ -159,7 +159,7 @@ public class TestUtils {
    *
    * @param name  name of a file in src/main/resources/certs.
    *
-   * @deprecated Not for public use
+   * @deprecated Not for public use. Use {@link TlsTesting#loadCert} instead.
    */
   @Deprecated
   public static File loadCert(String name) throws IOException {

testing/src/main/java/io/grpc/testing/TlsTesting.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2017, gRPC Authors All rights reserved.
+ *
+ * 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 io.grpc.testing;
+
+import io.grpc.ExperimentalApi;
+import java.io.InputStream;
+
+/** Convenience utilities for using TLS in tests. */
+@ExperimentalApi("https://github.com/grpc/grpc-java/issues/1791")
+public final class TlsTesting {
+  /**
+   * Retrieves the specified test certificate or key resource in src/main/resources/certs/ as an
+   * {@code InputStream}.
+   *
+   * @param name name of a file in src/main/resources/certs/, e.g., {@code "ca.key"}.
+   *
+   * @since 1.8.0
+   */
+  public static InputStream loadCert(String name) {
+    return TestUtils.class.getResourceAsStream("/certs/" + name);
+  }
+
+  private TlsTesting() {}
+}

testing/src/test/java/io/grpc/testing/TlsTestingTest.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2017, gRPC Authors All rights reserved.
+ *
+ * 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 io.grpc.testing;
+
+import static org.junit.Assert.assertNotNull;
+
+import java.io.InputStream;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+/** Unit tests for {@link TlsTesting}. */
+@RunWith(JUnit4.class)
+public class TlsTestingTest {
+  @Test
+  public void loadCert() throws Exception {
+    InputStream is = null;
+    try {
+      is = TlsTesting.loadCert("ca.key");
+      assertNotNull(is);
+    } finally {
+      if (is != null) {
+        is.close();
+      }
+    }
+  }
+}