fn:string, add basic all param test for metaschema-framework#132

core/src/test/java/gov/nist/secauto/metaschema/core/metapath/function/library/FnSubstringTest.java

@@ -0,0 +1,41 @@
+/*
+ * SPDX-FileCopyrightText: none
+ * SPDX-License-Identifier: CC0-1.0
+ */
+
+package gov.nist.secauto.metaschema.core.metapath.function.library;
+
+import static gov.nist.secauto.metaschema.core.metapath.TestUtils.string;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import gov.nist.secauto.metaschema.core.metapath.ExpressionTestBase;
+import gov.nist.secauto.metaschema.core.metapath.ISequence;
+import gov.nist.secauto.metaschema.core.metapath.MetapathExpression;
+
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.stream.Stream;
+
+import edu.umd.cs.findbugs.annotations.NonNull;
+
+class FnSubstringTest
+    extends ExpressionTestBase {
+  private static Stream<Arguments> provideValues() { // NOPMD - false positive
+    return Stream.of(
+        Arguments.of(
+            ISequence.of(string("ada")),
+            "substring('metadata', 4, 3)"));
+  }
+
+  @ParameterizedTest
+  @MethodSource("provideValues")
+  void testExpression(@NonNull ISequence<?> expected, @NonNull String metapath) {
+    assertEquals(
+        expected,
+        MetapathExpression.compile(metapath)
+            .evaluateAs(null, MetapathExpression.ResultType.SEQUENCE, newDynamicContext()));
+  }
+
+}