diff --git a/src/test/java/org/jsoup/helper/ValidateTest.java b/src/test/java/org/jsoup/helper/ValidateTest.java
index c7a093c358..cb15bcf737 100644
--- a/src/test/java/org/jsoup/helper/ValidateTest.java
+++ b/src/test/java/org/jsoup/helper/ValidateTest.java
@@ -43,4 +43,36 @@ public void testNotNull() {
         }
         assertTrue(threw);
     }
+    @Test
+    void testEnsureNotNullWithNonNullObject() {
+        Object nonNullObject = new Object();
+        assertEquals(nonNullObject, Validate.ensureNotNull(nonNullObject));
+    }
+
+    @Test
+    void testEnsureNotNullWithNullObject() {
+        Object nullObject = null;
+        assertThrows(ValidationException.class,() -> Validate.ensureNotNull(nullObject));
+    }
+
+    @Test
+    void testIsTrueWithFalseValue() {
+        assertThrows(ValidationException.class,() -> Validate.isTrue(false));
+    }
+
+    @Test
+    void testIsFalseWithTrueValue() {
+        assertThrows(ValidationException.class,() -> Validate.isFalse(true));
+    }
+
+    @Test
+    void testNoNullElementsWithNullElement() {
+        Object[] objects = { "notNull", null, "anotherNotNull" };
+        assertThrows(ValidationException.class, () -> Validate.noNullElements(objects, "Array must not contain null elements"));
+    }
+
+    @Test
+    void testSomeConditionThatShouldNotBeMet() {
+        assertThrows(ValidationException.class, () -> Validate.assertFail("This condition should not be met"));
+    }
 }
diff --git a/src/test/java/org/jsoup/nodes/AttributeTest.java b/src/test/java/org/jsoup/nodes/AttributeTest.java
index 454b3bb041..812fed410f 100644
--- a/src/test/java/org/jsoup/nodes/AttributeTest.java
+++ b/src/test/java/org/jsoup/nodes/AttributeTest.java
@@ -89,4 +89,14 @@ public void html() {
         Document doc2 = Jsoup.parse(html, Parser.htmlParser().settings(ParseSettings.preserveCase));
         assertEquals("<a href=\"autofocus\" REQUIRED>One</a>", doc2.selectFirst("a").outerHtml());
     }
+
+    @Test
+    void createFromEncoded() {
+        String unencodedKey = "src";
+        String encodedValue = "&lt;img src=&quot;/image.jpg&quot;&gt;";
+        Attribute attribute = Attribute.createFromEncoded(unencodedKey, encodedValue);
+        assertNotNull(attribute);
+        assertEquals(unencodedKey, attribute.getKey());
+        assertEquals("<img src=\"/image.jpg\">", attribute.getValue());
+    }
 }
diff --git a/src/test/java/org/jsoup/parser/PositionTest.java b/src/test/java/org/jsoup/parser/PositionTest.java
index 24beec8d5a..7e377d1bd7 100644
--- a/src/test/java/org/jsoup/parser/PositionTest.java
+++ b/src/test/java/org/jsoup/parser/PositionTest.java
@@ -1,19 +1,9 @@
 package org.jsoup.parser;
 
+import org.jsoup.Connection;
 import org.jsoup.Jsoup;
 import org.jsoup.integration.servlets.FileServlet;
-import org.jsoup.nodes.Attribute;
-import org.jsoup.nodes.CDataNode;
-import org.jsoup.nodes.Comment;
-import org.jsoup.nodes.DataNode;
-import org.jsoup.nodes.Document;
-import org.jsoup.nodes.DocumentType;
-import org.jsoup.nodes.Element;
-import org.jsoup.nodes.LeafNode;
-import org.jsoup.nodes.Node;
-import org.jsoup.nodes.Range;
-import org.jsoup.nodes.TextNode;
-import org.jsoup.nodes.XmlDeclaration;
+import org.jsoup.nodes.*;
 import org.jsoup.select.Elements;
 import org.junit.jupiter.api.Test;
 
@@ -533,6 +523,35 @@ private void printRange(Node node) {
         assertEquals(expectedRange, attr2.sourceRange().toString());
     }
 
+    @Test void hashCodeShouldBeConsistentWithEquals() {
+        String html = "<div one=\"Hello\nthere\" \nid=1 \nclass=\nfoo\nattr5 data-custom=\"123\">Text";
+        Document doc = Jsoup.parse(html, TrackingHtmlParser);
+
+        Element div = doc.expectFirst("div");
+
+        Range.AttributeRange classAttributeRange = div.attributes().sourceRange("class");
+        int classAttributeNameRangeHash = classAttributeRange.nameRange().hashCode();
+        int classAttributeValueRangeHash = classAttributeRange.valueRange().hashCode();
+
+        Range.AttributeRange customAttributeRange = div.attributes().sourceRange("data-custom");
+        int customAttributeRangeNameRangeHash = customAttributeRange.nameRange().hashCode();
+        int customAttributeRangeValueRangeHash = customAttributeRange.valueRange().hashCode();
+
+
+        assertEquals(31 * classAttributeNameRangeHash + classAttributeValueRangeHash, classAttributeRange.hashCode());
+        assertEquals(31 * customAttributeRangeNameRangeHash + customAttributeRangeValueRangeHash, customAttributeRange.hashCode());
+    }
+
+    @Test public void formDataWithNoSelectedOption() {
+        String html = "<form><select name='foo'><option value='one'><option value='two'><option value='three'></form>";
+        Document doc = Jsoup.parse(html);
+        FormElement form = (FormElement) doc.select("form").first();
+        List<Connection.KeyVal> data = form.formData();
+
+        assertEquals(1, data.size());
+        assertEquals("foo=one", data.get(0).toString());
+    }
+
     static void accumulateAttributePositions(Node node, StringBuilder sb) {
         if (node instanceof LeafNode) return; // leafnode pseudo attributes are not tracked
         for (Attribute attribute : node.attributes()) {