Add unit test for object truth values

src/test/java/com/hubspot/jinjava/lib/tag/IfTagTest.java

@@ -7,6 +7,8 @@
 import com.hubspot.jinjava.BaseInterpretingTest;
 import com.hubspot.jinjava.tree.TagNode;
 import com.hubspot.jinjava.tree.TreeParser;
+import com.hubspot.jinjava.util.HasObjectTruthValue;
+import com.hubspot.jinjava.util.ObjectTruthValueTest;
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import org.junit.Before;
@@ -34,6 +36,17 @@ public void itDoesntEvalChildrenWhenExprIsFalse() {
     assertThat(tag.interpret(n, interpreter).trim()).isEqualTo("");
   }
 
+  @Test
+  public void itChecksObjectTruthValue() {
+    context.put("foo", new TestObject().setObjectTruthValue(true));
+    TagNode n = fixture("if-object");
+    assertThat(tag.interpret(n, interpreter).trim()).isEqualTo("ifblock");
+
+    context.put("foo", new TestObject().setObjectTruthValue(false));
+    n = fixture("if-object");
+    assertThat(tag.interpret(n, interpreter).trim()).isEqualTo("");
+  }
+
   @Test
   public void itTreatsNotFoundPropsAsNull() {
     context.put("settings", new Object());
@@ -117,4 +130,18 @@ private TagNode fixture(String name) {
       throw new RuntimeException(e);
     }
   }
+
+  private class TestObject implements HasObjectTruthValue {
+    private boolean objectTruthValue = false;
+
+    public TestObject setObjectTruthValue(boolean objectTruthValue) {
+      this.objectTruthValue = objectTruthValue;
+      return this;
+    }
+
+    @Override
+    public boolean getObjectTruthValue() {
+      return objectTruthValue;
+    }
+  }
 }

src/test/java/com/hubspot/jinjava/util/ObjectTruthValueTest.java

@@ -0,0 +1,31 @@
+package com.hubspot.jinjava.util;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class ObjectTruthValueTest {
+
+  @Test
+  public void itEvaluatesObjectsWithObjectTruthValue() {
+    assertThat(ObjectTruthValue.evaluate(new TestObject().setObjectTruthValue(true)))
+      .isTrue();
+    assertThat(ObjectTruthValue.evaluate(new TestObject().setObjectTruthValue(false)))
+      .isFalse();
+  }
+
+  private class TestObject implements HasObjectTruthValue {
+    private boolean objectTruthValue = false;
+
+    public TestObject setObjectTruthValue(boolean objectTruthValue) {
+      this.objectTruthValue = objectTruthValue;
+      return this;
+    }
+
+    @Override
+    public boolean getObjectTruthValue() {
+      return objectTruthValue;
+    }
+  }
+}

src/test/resources/tags/iftag/if-object.jinja

@@ -0,0 +1,3 @@
+{% if foo %}
+ifblock
+{% endif %}