Function Invocation equals and hashcode integration test implementation

Author: dajh-horta

liquidjava-verifier/src/test/java/liquidjava/rj_language/ast/TestFunctionInvocation.java

@@ -0,0 +1,23 @@
+package liquidjava.rj_language.ast;
+
+import java.util.Arrays;
+
+import static org.junit.Assert.assertTrue;
+
+import liquidjava.rj_language.opt.Test;
+
+public class TestFunctionInvocation {
+    @Test
+    public void testFunctionInvocationEqualsAndHashcode(){
+        Expression exp1 = new LiteralString("./testFiles/file.txt");
+        Expression exp2 = new LiteralString("./testFiles/file_fake.txt");
+
+        FunctionInvocation f1 = new FunctionInvocation("java.nio.file.Paths.get", Arrays.asList(exp1));
+        FunctionInvocation f2 = new FunctionInvocation("java.nio.file.Paths.get", Arrays.asList(exp1));
+        FunctionInvocation f3 = new FunctionInvocation("java.nio.file.Paths.get", Arrays.asList(exp2));
+
+        assertTrue(f1.equals(f2) && !f1.equals(f3));
+        assertTrue(f1.hashCode() == f2.hashCode() && f1.hashCode() != f3.hashCode());
+    }
+    
+}