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diff --git a/tests/rustdoc-gui/docblock-code-block-line-number.goml b/tests/rustdoc-gui/docblock-code-block-line-number.goml
new file mode 100644
index 000000000..69bcf5339
--- /dev/null
+++ b/tests/rustdoc-gui/docblock-code-block-line-number.goml
@@ -0,0 +1,71 @@
+// Checks that the setting "line numbers" is working as expected.
+goto: "file://" + |DOC_PATH| + "/test_docs/fn.foo.html"
+
+// Otherwise, we can't check text color
+show-text: true
+
+// We check that without this setting, there is no line number displayed.
+assert-false: "pre.example-line-numbers"
+
+// Let's now check some CSS properties...
+define-function: (
+    "check-colors",
+    (theme, color),
+    block {
+        // We now set the setting to show the line numbers on code examples.
+        local-storage: {
+            "rustdoc-theme": |theme|,
+            "rustdoc-use-system-theme": "false",
+            "rustdoc-line-numbers": "true"
+        }
+        // We reload to make the line numbers appear and change theme.
+        reload:
+        // We wait for them to be added into the DOM by the JS...
+        wait-for: "pre.example-line-numbers"
+        // If the test didn't fail, it means that it was found!
+        assert-css: (
+            "pre.example-line-numbers",
+            {
+                "color": |color|,
+                "margin": "0px",
+                "padding": "14px 8px",
+                "text-align": "right",
+            },
+            ALL,
+        )
+    },
+)
+call-function: ("check-colors", {
+    "theme": "ayu",
+    "color": "rgb(92, 103, 115)",
+})
+call-function: ("check-colors", {
+    "theme": "dark",
+    "color": "rgb(59, 145, 226)",
+})
+call-function: ("check-colors", {
+    "theme": "light",
+    "color": "rgb(198, 126, 45)",
+})
+
+// The first code block has two lines so let's check its `<pre>` elements lists both of them.
+assert-text: ("pre.example-line-numbers", "1\n2")
+
+// Now, try changing the setting dynamically. We'll turn it off, using the settings menu,
+// and make sure it goes away.
+
+// First, open the settings menu.
+click: "#settings-menu"
+wait-for: "#settings"
+assert-css: ("#settings", {"display": "block"})
+
+// Then, click the toggle button.
+click: "input#line-numbers"
+wait-for: 100 // wait-for-false does not exist
+assert-false: "pre.example-line-numbers"
+assert-local-storage: {"rustdoc-line-numbers": "false" }
+
+// Finally, turn it on again.
+click: "input#line-numbers"
+wait-for: "pre.example-line-numbers"
+assert-local-storage: {"rustdoc-line-numbers": "true" }