diff --git a/.tests/OperationTest.php b/.tests/OperationTest.php
index 113c90a..192c53e 100644
--- a/.tests/OperationTest.php
+++ b/.tests/OperationTest.php
@@ -54,3 +54,312 @@
     echo 'Test failed: ' . $Case . ':L' . __LINE__ . '().' . PHP_EOL;
     exit($ExitCode);
 }
+
+// Try to not look too deeply into my choice of data to be included here,
+// excluded, or which details are connected. It's generally arbitrary, chosen
+// merely for the sake of having something simple, concise, but not overly
+// large to be able to perform some tests against, to ensure that the operation
+// handler's ifCompare method is working as intended. That's it.
+$TestData = [
+    'AU' => [
+        'Country' => 'Australia',
+        'Region' => 'Oceania',
+        'British Empire 1921' => true
+    ],
+    'CA' => [
+        'Country' => 'Canada',
+        'Region' => 'North America',
+        'British Empire 1921' => true
+    ],
+    'CN' => [
+        'Country' => 'China',
+        'Region' => 'Asia',
+        'British Empire 1921' => false
+    ],
+    'DE' => [
+        'Country' => 'Germany',
+        'Region' => 'Europe',
+        'British Empire 1921' => false
+    ],
+    'ES' => [
+        'Country' => 'Spain',
+        'Region' => 'Europe',
+        'British Empire 1921' => false
+    ],
+    'FR' => [
+        'Country' => 'France',
+        'Region' => 'Europe',
+        'British Empire 1921' => false
+    ],
+    'IN' => [
+        'Country' => 'India',
+        'Region' => 'Asia',
+        'British Empire 1921' => true
+    ],
+    'JP' => [
+        'Country' => 'Japan',
+        'Region' => 'Asia',
+        'British Empire 1921' => false
+    ],
+    'NZ' => [
+        'Country' => 'New Zealand',
+        'Region' => 'Oceania',
+        'British Empire 1921' => true
+    ],
+    'PT' => [
+        'Country' => 'Portugal',
+        'Region' => 'Europe',
+        'British Empire 1921' => false
+    ],
+    'US' => [
+        'Country' => 'the United States',
+        'Region' => 'North America',
+        'British Empire 1921' => false
+    ],
+    'VN' => [
+        'Country' => 'Vietnam',
+        'Region' => 'Asia',
+        'British Empire 1921' => false
+    ]
+];
+$Keys = array_keys($TestData);
+$Expected = 'In 1921, Australia WAS a part of the British Empire.
+Australia and Canada belong to different regions.
+Australia and China belong to different regions.
+Australia and Germany belong to different regions.
+Australia and Spain belong to different regions.
+Australia and France belong to different regions.
+Australia and India belong to different regions.
+Australia and Japan belong to different regions.
+Australia and New Zealand belong to the same region: Oceania.
+Australia and Portugal belong to different regions.
+Australia and the United States belong to different regions.
+Australia and Vietnam belong to different regions.
+In 1921, Canada WAS a part of the British Empire.
+Canada and Australia belong to different regions.
+Canada and China belong to different regions.
+Canada and Germany belong to different regions.
+Canada and Spain belong to different regions.
+Canada and France belong to different regions.
+Canada and India belong to different regions.
+Canada and Japan belong to different regions.
+Canada and New Zealand belong to different regions.
+Canada and Portugal belong to different regions.
+Canada and the United States belong to the same region: North America.
+Canada and Vietnam belong to different regions.
+In 1921, China was NOT a part of the British Empire.
+China and Australia belong to different regions.
+China and Canada belong to different regions.
+China and Germany belong to different regions.
+China and Spain belong to different regions.
+China and France belong to different regions.
+China and India belong to the same region: Asia.
+China and Japan belong to the same region: Asia.
+China and New Zealand belong to different regions.
+China and Portugal belong to different regions.
+China and the United States belong to different regions.
+China and Vietnam belong to the same region: Asia.
+In 1921, Germany was NOT a part of the British Empire.
+Germany and Australia belong to different regions.
+Germany and Canada belong to different regions.
+Germany and China belong to different regions.
+Germany and Spain belong to the same region: Europe.
+Germany and France belong to the same region: Europe.
+Germany and India belong to different regions.
+Germany and Japan belong to different regions.
+Germany and New Zealand belong to different regions.
+Germany and Portugal belong to the same region: Europe.
+Germany and the United States belong to different regions.
+Germany and Vietnam belong to different regions.
+In 1921, Spain was NOT a part of the British Empire.
+Spain and Australia belong to different regions.
+Spain and Canada belong to different regions.
+Spain and China belong to different regions.
+Spain and Germany belong to the same region: Europe.
+Spain and France belong to the same region: Europe.
+Spain and India belong to different regions.
+Spain and Japan belong to different regions.
+Spain and New Zealand belong to different regions.
+Spain and Portugal belong to the same region: Europe.
+Spain and the United States belong to different regions.
+Spain and Vietnam belong to different regions.
+In 1921, France was NOT a part of the British Empire.
+France and Australia belong to different regions.
+France and Canada belong to different regions.
+France and China belong to different regions.
+France and Germany belong to the same region: Europe.
+France and Spain belong to the same region: Europe.
+France and India belong to different regions.
+France and Japan belong to different regions.
+France and New Zealand belong to different regions.
+France and Portugal belong to the same region: Europe.
+France and the United States belong to different regions.
+France and Vietnam belong to different regions.
+In 1921, India WAS a part of the British Empire.
+India and Australia belong to different regions.
+India and Canada belong to different regions.
+India and China belong to the same region: Asia.
+India and Germany belong to different regions.
+India and Spain belong to different regions.
+India and France belong to different regions.
+India and Japan belong to the same region: Asia.
+India and New Zealand belong to different regions.
+India and Portugal belong to different regions.
+India and the United States belong to different regions.
+India and Vietnam belong to the same region: Asia.
+In 1921, Japan was NOT a part of the British Empire.
+Japan and Australia belong to different regions.
+Japan and Canada belong to different regions.
+Japan and China belong to the same region: Asia.
+Japan and Germany belong to different regions.
+Japan and Spain belong to different regions.
+Japan and France belong to different regions.
+Japan and India belong to the same region: Asia.
+Japan and New Zealand belong to different regions.
+Japan and Portugal belong to different regions.
+Japan and the United States belong to different regions.
+Japan and Vietnam belong to the same region: Asia.
+In 1921, New Zealand WAS a part of the British Empire.
+New Zealand and Australia belong to the same region: Oceania.
+New Zealand and Canada belong to different regions.
+New Zealand and China belong to different regions.
+New Zealand and Germany belong to different regions.
+New Zealand and Spain belong to different regions.
+New Zealand and France belong to different regions.
+New Zealand and India belong to different regions.
+New Zealand and Japan belong to different regions.
+New Zealand and Portugal belong to different regions.
+New Zealand and the United States belong to different regions.
+New Zealand and Vietnam belong to different regions.
+In 1921, Portugal was NOT a part of the British Empire.
+Portugal and Australia belong to different regions.
+Portugal and Canada belong to different regions.
+Portugal and China belong to different regions.
+Portugal and Germany belong to the same region: Europe.
+Portugal and Spain belong to the same region: Europe.
+Portugal and France belong to the same region: Europe.
+Portugal and India belong to different regions.
+Portugal and Japan belong to different regions.
+Portugal and New Zealand belong to different regions.
+Portugal and the United States belong to different regions.
+Portugal and Vietnam belong to different regions.
+In 1921, the United States was NOT a part of the British Empire.
+The United States and Australia belong to different regions.
+The United States and Canada belong to the same region: North America.
+The United States and China belong to different regions.
+The United States and Germany belong to different regions.
+The United States and Spain belong to different regions.
+The United States and France belong to different regions.
+The United States and India belong to different regions.
+The United States and Japan belong to different regions.
+The United States and New Zealand belong to different regions.
+The United States and Portugal belong to different regions.
+The United States and Vietnam belong to different regions.
+In 1921, Vietnam was NOT a part of the British Empire.
+Vietnam and Australia belong to different regions.
+Vietnam and Canada belong to different regions.
+Vietnam and China belong to the same region: Asia.
+Vietnam and Germany belong to different regions.
+Vietnam and Spain belong to different regions.
+Vietnam and France belong to different regions.
+Vietnam and India belong to the same region: Asia.
+Vietnam and Japan belong to the same region: Asia.
+Vietnam and New Zealand belong to different regions.
+Vietnam and Portugal belong to different regions.
+Vietnam and the United States belong to different regions.
+';
+$Out = '';
+foreach ($Keys as $KeyA) {
+    $Out .= 'In 1921, ' . $Object->dataTraverse($TestData, $KeyA . '.Country') . ' ' . $Object->ifCompare($TestData, 'if {' . $KeyA . '.British Empire 1921}==={AU.British Empire 1921} then WAS else was NOT') . " a part of the British Empire.\n";
+    foreach ($Keys as $KeyB) {
+        if ($KeyA === $KeyB) {
+            continue;
+        }
+        $Try = $Object->ifCompare($TestData, 'if {' . $KeyA . '.Region}==={' . $KeyB . '.Region} then {' . $KeyA . '.Region} else Different');
+        $Out .= ucfirst($Object->dataTraverse($TestData, $KeyA . '.Country')) . ' and ' . $Object->dataTraverse($TestData, $KeyB . '.Country') . ' belong to ' . ($Try === 'Different' ? 'different regions.' : 'the same region: ' . $Try . '.') . "\n";
+    }
+}
+
+echo $Out;
+
+$ExitCode++;
+if ($Out !== $Expected) {
+    echo 'Test failed: ' . $Case . ':L' . __LINE__ . '().' . PHP_EOL;
+    exit($ExitCode);
+}
+
+// singleCompare examples from the documentation.
+$Expected = [true, false, true, true, true, false, false, true, true];
+
+$Out = [
+    $Object->singleCompare('1.2.3', '^1'),
+    $Object->singleCompare('1.2.3', '^2'),
+    $Object->singleCompare('1.2.3', '>=1 <2'),
+    $Object->singleCompare('2.3.4', '>=2.3 <4'),
+    $Object->singleCompare('3.4.5', '^1|^3'),
+    $Object->singleCompare('4.5.6', '<4'),
+    $Object->singleCompare('4.5.6', '<=4'),
+    $Object->singleCompare('4.5.6', '<=5'),
+    $Object->singleCompare('4.5.6', '4.5.6')
+];
+
+$ExitCode++;
+if ($Out !== $Expected) {
+    echo 'Test failed: ' . $Case . ':L' . __LINE__ . '().' . PHP_EOL;
+    exit($ExitCode);
+}
+
+// dataTraverse examples from the documentation.
+$TestData = [
+    'Foo' => [
+        'Bar' => ['Hello' => 'World', 'Goodbye' => 'Cruel World'],
+        'Baz' => 'Hello World!'
+    ],
+    'Far' => ['Boo' => 'To You'],
+    'Plenty of space' => '   ...yep.'
+];
+
+$Expected = ['World', 'Cruel World', 11, 'Hello World!', 'HELLO WORLD!', 'hello world!', '   ...yep.', '...yep.', '', 'World'];
+
+$Out = [
+    $Object->dataTraverse($TestData, 'Foo.Bar.Hello'),
+    $Object->dataTraverse($TestData, 'Foo.Bar.Goodbye'),
+    $Object->dataTraverse($TestData, 'Foo.Bar.Goodbye.strlen()'),
+    $Object->dataTraverse($TestData, 'Foo.Baz'),
+    $Object->dataTraverse($TestData, 'Foo.Baz.strtoupper()'),
+    $Object->dataTraverse($TestData, 'Foo.Baz.strtolower()'),
+    $Object->dataTraverse($TestData, 'Plenty of space'),
+    $Object->dataTraverse($TestData, 'Plenty of space.trim()'),
+    $Object->dataTraverse($TestData, 'This element does not exist'),
+    $Object->dataTraverse($TestData, 'Foo.Bar.Hello.Element is not an array')
+];
+
+$ExitCode++;
+if ($Out !== $Expected) {
+    echo 'Test failed: ' . $Case . ':L' . __LINE__ . '().' . PHP_EOL;
+    exit($ExitCode);
+}
+
+// ifCompare examples from the documentation.
+$TestData = [
+    'Foo' => ['Bar' => 'Hello', 'Baz' => 'Goodbye'],
+    'Numbers' => ['One' => 1, 'Ten' => 10, 'Hundred' => 100],
+    'Versions' => ['First' => '1.2.3', 'Second' => '2.3.4']
+];
+
+$Expected = ['Hello', 'Success', 'Failure', 'Yeah, sounds right.', 'Sayonara', 'They are different'];
+
+$Out = [
+    $Object->ifCompare($TestData, 'if {Versions.Second}^2.3 then {Foo.Bar} else {Foo.Baz}'),
+    $Object->ifCompare($TestData, 'if {Versions.Second}^2.3 thenif {Versions.First}^1.2 then Success else Failure'),
+    $Object->ifCompare($TestData, 'if {Versions.Second}^1.2 thenif {Versions.First}^3.4 then Success else Failure'),
+    $Object->ifCompare($TestData, 'if 1>2 then WTH? else Yeah, sounds right.'),
+    $Object->ifCompare($TestData, 'if {Foo.Baz}===Goodbye then Sayonara else Ohayogozaimasu'),
+    $Object->ifCompare($TestData, 'if {Versions.Second}==={Versions.First} then They are the same else They are different')
+];
+
+$ExitCode++;
+if ($Out !== $Expected) {
+    echo 'Test failed: ' . $Case . ':L' . __LINE__ . '().' . PHP_EOL;
+    exit($ExitCode);
+}
diff --git a/Changelog.txt b/Changelog.txt
index bf4d423..fcf30cd 100644
--- a/Changelog.txt
+++ b/Changelog.txt
@@ -11,7 +11,8 @@ found at:
 
 === Changes made since last versioned release ===
 
-(none)
+- [2023.08.18; Maikuolan]: Improved tests and documentation for the operation
+  handler.
 
 === Version/Release 2.9.7 ===
 PATCH RELEASE.
diff --git a/_docs/Operation.md b/_docs/Operation.md
index 7a9d7b7..554631c 100644
--- a/_docs/Operation.md
+++ b/_docs/Operation.md
@@ -244,8 +244,7 @@ $Arr = [
 
 var_dump($Object->dataTraverse($Arr, 'Foo.Bar.Hello'));
 var_dump($Object->dataTraverse($Arr, 'Foo.Bar.Goodbye'));
-var_dump($Object->dataTraverse($Arr, 'Foo.Bar.strlen()'));
-var_dump($Object->dataTraverse($Arr, 'Foo.Baz'));
+var_dump($Object->dataTraverse($Arr, 'Foo.Bar.Goodbye.strlen()'));
 var_dump($Object->dataTraverse($Arr, 'Foo.Baz'));
 var_dump($Object->dataTraverse($Arr, 'Foo.Baz.strtoupper()'));
 var_dump($Object->dataTraverse($Arr, 'Foo.Baz.strtolower()'));
@@ -321,4 +320,4 @@ If more complex usage is needed in the future, the capabilities of this class ca
 ---
 
 
-Last Updated: 16 March 2023 (2023.03.16).
+Last Updated: 18 August 2023 (2023.08.18).