Adds integration test that measures VPP API coverage

Run using:

mvn test -pl it/api-coverage -Papi-coverage

Change-Id: I6d708ca867a83e49522947b571304c4666bf65b5
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>

1 files changed, 82 insertions, 0 deletions

diff --git a/it/api-coverage/src/test/java/io/fd/hc2vpp/it/JVppCoverageTest.java b/it/api-coverage/src/test/java/io/fd/hc2vpp/it/JVppCoverageTest.java
new file mode 100644
index 000000000..406cd0189
--- /dev/null
+++ b/it/api-coverage/src/test/java/io/fd/hc2vpp/it/JVppCoverageTest.java
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ *
+ * 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.fd.hc2vpp.it;
+
+import io.fd.vpp.jvpp.acl.JVppAcl;
+import io.fd.vpp.jvpp.core.JVppCore;
+import io.fd.vpp.jvpp.ioamexport.JVppIoamexport;
+import io.fd.vpp.jvpp.ioampot.JVppIoampot;
+import io.fd.vpp.jvpp.ioamtrace.JVppIoamtrace;
+import io.fd.vpp.jvpp.snat.JVppSnat;
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.util.Scanner;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class JVppCoverageTest {
+
+    private static final Logger LOG = LoggerFactory.getLogger(JVppCoverageTest.class);
+
+    @Test
+    public void coverageTest() throws IOException {
+        final Class[] apis = new Class[] {
+            JVppCore.class,
+            JVppAcl.class,
+            JVppSnat.class,
+            JVppIoamtrace.class,
+            JVppIoamexport.class,
+            JVppIoampot.class
+        };
+        int covered = 0;
+        int methods = 0;
+        for (Class api : apis) {
+            final Method[] declaredMethods = api.getDeclaredMethods();
+            methods += declaredMethods.length - 1; // excluding send method
+            covered += coverage(api, declaredMethods);
+        }
+        LOG.info("#methods={} covered={} ({}%)", methods, covered, (100.0 * covered) / methods);
+    }
+
+    private static int coverage(final Class api, final Method[] methods) throws IOException {
+        int covered = 0;
+        int nMethods = methods.length - 1; // excluding send method
+        for (Method method : methods) {
+            LOG.info(method.getName());
+            if (isMethodCovered(method.getName())) {
+                covered++;
+            }
+        }
+        covered--; // excluding send
+        LOG.info("{}: #methods={} covered={} ({}%)", api, nMethods, covered, (100.0 * covered) / nMethods);
+        return covered;
+    }
+
+    private static boolean isMethodCovered(final String name) throws IOException {
+        final Runtime rt = Runtime.getRuntime();
+        // TODO (grep per api name is slow):
+        // scan all java files for jvpp invocations, make a set/map and use it for usage lookup
+        final String[] cmd =
+            {"/bin/sh", "-c", "grep -rn /home/m/hc2vpp --include *.java -rn . -e \"" + name + "\" | wc -l"};
+        final Process proc = rt.exec(cmd);
+        final Scanner sc = new Scanner(proc.getInputStream());
+        final int nRefs = sc.nextInt();
+        LOG.info("Method {} was referenced {}", name, nRefs);
+        return nRefs > 0;
+    }
+}