Enable running jni test during gradle build

CHANGELOG.md

@@ -26,6 +26,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Infrastructure
 * Manually install zlib for win CI [#1513](https://github.com/opensearch-project/k-NN/pull/1513)
 * Update k-NN build artifact script to enable SIMD on ARM for Faiss [#1543](https://github.com/opensearch-project/k-NN/pull/1543)
+* Enable running jni test during gradle build [#1553](https://github.com/opensearch-project/k-NN/pull/1553)
 ### Documentation
 ### Maintenance
 * Bump faiss lib commit to 32f0e8cf92cd2275b60364517bb1cce67aa29a55 [#1443](https://github.com/opensearch-project/k-NN/pull/1443)

DEVELOPER_GUIDE.md

@@ -219,6 +219,21 @@ run:
 ./bin/jni_test --gtest_filter=Faiss*
 ```
 
+To run JNI Tests via gradle:
+```
+# To run all tests
+./gradlew jniTest
+
+# To run nmslib tests
+./gradlew jniTest -Dgtest_filter=Nmslib*
+
+# To run faiss tests
+./gradlew jniTest -Dgtest_filter=Faiss*
+```
+
+The task `jniTest` is a dependency if `check` task which ensures that JNI tests are running as part of `./gradlew build` command.
+
+
 ### JNI Library Artifacts
 
 We build and distribute binary library artifacts with OpenSearch. We build the library binaries in 

build.gradle

@@ -310,6 +310,23 @@ task cmakeJniLib(type:Exec) {
     }
 }
 
+tasks.register('jniTest', Exec) {
+    if (!Os.isFamily(Os.FAMILY_WINDOWS)) {
+        dependsOn cmakeJniLib
+        var args = ''
+        if (System.getProperty("gtest_filter") != null) {
+            args = '--gtest_filter=' + System.getProperty("gtest_filter")
+        }
+        workingDir 'jni'
+        commandLine 'make' , 'jni_test'
+        commandLine './bin/jni_test' , "${args}"
+    }
+}
+
+// Ensure that jniTest task is running during the ./gradlew build
+check.dependsOn jniTest
+
+
 task buildJniLib(type:Exec) {
     dependsOn cmakeJniLib
     workingDir 'jni'