more tests and coverage printer

Author: duhizjame

server/core/src/main/java/io/whitefox/core/types/predicates/BaseOp.java

@@ -112,11 +112,7 @@ default void validateChildren(List<BaseOp> children) throws PredicateException {
     }
 
     for (BaseOp c : children) {
-      try {
-        c.validate();
-      } catch (PredicateException e) {
-        throw new RuntimeException(e);
-      }
+      c.validate();
     }
   }
 }

server/core/src/test/java/io/whitefox/core/types/predicates/EvalHelperTest.java

@@ -0,0 +1,36 @@
+package io.whitefox.core.types.predicates;
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import io.whitefox.core.types.DateType;
+import io.whitefox.core.types.IntegerType;
+import java.util.List;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+
+public class EvalHelperTest {
+
+  @Test
+  void testLessThan() throws PredicateException {
+    var evalContext1 = new EvalContext(Map.of("date", "2020-10-10"), Map.of());
+    var children1 =
+        List.of(new ColumnOp("date", DateType.DATE), new LiteralOp("2020-10-11", DateType.DATE));
+    assertTrue(EvalHelper.lessThan(children1, evalContext1));
+    var evalContext2 = new EvalContext(Map.of("integer", "19"), Map.of());
+    var children2 = List.of(
+        new ColumnOp("integer", IntegerType.INTEGER), new LiteralOp("20", IntegerType.INTEGER));
+    assertTrue(EvalHelper.lessThan(children2, evalContext2));
+  }
+
+  @Test
+  void testEqual() throws PredicateException {
+    var evalContext1 = new EvalContext(Map.of("date", "2020-10-11"), Map.of());
+    var children1 =
+        List.of(new ColumnOp("date", DateType.DATE), new LiteralOp("2020-10-11", DateType.DATE));
+    assertTrue(EvalHelper.equal(children1, evalContext1));
+    var evalContext2 = new EvalContext(Map.of("integer", "20"), Map.of());
+    var children2 = List.of(
+        new ColumnOp("integer", IntegerType.INTEGER), new LiteralOp("20", IntegerType.INTEGER));
+    assertTrue(EvalHelper.equal(children2, evalContext2));
+  }
+}