diff --git a/c_glib/arrow-glib/basic-array.cpp b/c_glib/arrow-glib/basic-array.cpp
index 43b2737b6f09b..3a7bdfa2760ca 100644
--- a/c_glib/arrow-glib/basic-array.cpp
+++ b/c_glib/arrow-glib/basic-array.cpp
@@ -1017,6 +1017,22 @@ garrow_array_concatenate(GArrowArray *array, GList *other_arrays, GError **error
   }
 }
 
+/**
+ * garrow_array_validate:
+ * @array: A #GArrowArray.
+ * @error: (nullable): Return location for a #GError or %NULL.
+ *
+ * Returns: %TRUE on success, %FALSE on error.
+ *
+ * Since: 20.0.0
+ */
+gboolean
+garrow_array_validate(GArrowArray *array, GError **error)
+{
+  const auto arrow_array = garrow_array_get_raw(array);
+  return garrow::check(error, arrow_array->Validate(), "[array][validate]");
+}
+
 G_DEFINE_TYPE(GArrowNullArray, garrow_null_array, GARROW_TYPE_ARRAY)
 
 static void
@@ -3316,22 +3332,6 @@ garrow_decimal256_array_get_value(GArrowDecimal256Array *array, gint64 i)
   return garrow_decimal256_new_raw(&arrow_decimal256);
 }
 
-/**
- * garrow_array_validate:
- * @array: A #GArrowArray.
- * @error: (nullable): Return location for a #GError or %NULL.
- *
- * Returns: %TRUE on success, %FALSE on error.
- *
- * Since: 20.0.0
- */
-gboolean
-garrow_array_validate(GArrowArray *array, GError **error)
-{
-  const auto arrow_array = garrow_array_get_raw(array);
-  return garrow::check(error, arrow_array->Validate(), "[array][validate]");
-}
-
 typedef struct GArrowExtensionArrayPrivate_
 {
   GArrowArray *storage;
diff --git a/c_glib/arrow-glib/basic-array.h b/c_glib/arrow-glib/basic-array.h
index a661c3f5f89ef..0f068a0bee9e4 100644
--- a/c_glib/arrow-glib/basic-array.h
+++ b/c_glib/arrow-glib/basic-array.h
@@ -126,6 +126,10 @@ GARROW_AVAILABLE_IN_4_0
 GArrowArray *
 garrow_array_concatenate(GArrowArray *array, GList *other_arrays, GError **error);
 
+GARROW_AVAILABLE_IN_20_0
+gboolean
+garrow_array_validate(GArrowArray *array, GError **error);
+
 #define GARROW_TYPE_NULL_ARRAY (garrow_null_array_get_type())
 GARROW_AVAILABLE_IN_ALL
 G_DECLARE_DERIVABLE_TYPE(
@@ -890,10 +894,6 @@ GARROW_AVAILABLE_IN_ALL
 GArrowDecimal256 *
 garrow_decimal256_array_get_value(GArrowDecimal256Array *array, gint64 i);
 
-GARROW_AVAILABLE_IN_20_0
-gboolean
-garrow_array_validate(GArrowArray *array, GError **error);
-
 GARROW_AVAILABLE_IN_3_0
 GArrowArray *
 garrow_extension_array_get_storage(GArrowExtensionArray *array);
diff --git a/c_glib/test/test-array.rb b/c_glib/test/test-array.rb
index 03ddd593fc427..107730a1aa645 100644
--- a/c_glib/test/test-array.rb
+++ b/c_glib/test/test-array.rb
@@ -116,18 +116,6 @@ def test_to_s
     CONTENT
   end
 
-  def test_validation_success
-    array = build_int32_array([1, 2, 3, 4, 5])
-    assert_equal(true, array.validate)
-  end
-
-  def test_validation_fail
-    array = Arrow::Int8Array.new(-1, Arrow::Buffer.new(""), Arrow::Buffer.new(""), -1)
-    assert_raise(Arrow::Error::Invalid) do
-      array.validate
-    end
-  end
-
   sub_test_case("#view") do
     def test_valid
       assert_equal(build_float_array([0.0, 1.5, -2.5, nil]),
@@ -197,4 +185,21 @@ def test_mixed_type
       end
     end
   end
+
+  sub_test_case("#validate") do
+    def test_valid
+      array = build_int32_array([1, 2, 3, 4, 5])
+      assert do
+        array.validate
+      end
+    end
+
+    def test_invalid
+      message = "[array][validate]: Invalid: Array length is negative"
+      array = Arrow::Int8Array.new(-1, Arrow::Buffer.new(""), Arrow::Buffer.new(""), -1)
+      assert_raise(Arrow::Error::Invalid.new(message)) do
+        array.validate
+      end
+    end
+  end
 end