Add support for Apache Commons Lang StringUtils

java/ql/test/library-tests/frameworks/apache-commons-lang3/flow.ql

@@ -0,0 +1,30 @@
+import java
+import semmle.code.java.dataflow.TaintTracking
+import TestUtilities.InlineExpectationsTest
+
+class Conf extends TaintTracking::Configuration {
+  Conf() { this = "qltest:frameworks:apache-commons-lang3" }
+
+  override predicate isSource(DataFlow::Node n) {
+    n.asExpr().(MethodAccess).getMethod().hasName("taint")
+  }
+
+  override predicate isSink(DataFlow::Node n) {
+    exists(MethodAccess ma | ma.getMethod().hasName("sink") | n.asExpr() = ma.getAnArgument())
+  }
+}
+
+class HasFlowTest extends InlineExpectationsTest {
+  HasFlowTest() { this = "HasFlowTest" }
+
+  override string getARelevantTag() { result = "hasTaintFlow" }
+
+  override predicate hasActualResult(Location location, string element, string tag, string value) {
+    tag = "hasTaintFlow" and
+    exists(DataFlow::Node src, DataFlow::Node sink, Conf conf | conf.hasFlow(src, sink) |
+      sink.getLocation() = location and
+      element = sink.toString() and
+      value = "y"
+    )
+  }
+}