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diff --git a/devtools/server/tests/chrome/inactive-property-helper/grid-container-properties.mjs b/devtools/server/tests/chrome/inactive-property-helper/grid-container-properties.mjs
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+++ b/devtools/server/tests/chrome/inactive-property-helper/grid-container-properties.mjs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+// InactivePropertyHelper test cases:
+// `grid-auto-columns`, `grid-auto-flow`, `grid-auto-rows`, `grid-template`,
+// `grid-template-areas`, `grid-template-columns`, `grid-template-rows`,
+// and `justify-items`.
+let tests = [];
+
+for (const { propertyName, propertyValue } of [
+  { propertyName: "grid-auto-columns", propertyValue: "100px" },
+  { propertyName: "grid-auto-flow", propertyValue: "columns" },
+  { propertyName: "grid-auto-rows", propertyValue: "100px" },
+  { propertyName: "grid-template", propertyValue: "auto / auto" },
+  { propertyName: "grid-template-areas", propertyValue: "a b c" },
+  { propertyName: "grid-template-columns", propertyValue: "100px 1fr" },
+  { propertyName: "grid-template-rows", propertyValue: "100px 1fr" },
+  { propertyName: "justify-items", propertyValue: "center" },
+]) {
+  tests = tests.concat(createTestsForProp(propertyName, propertyValue));
+}
+
+function createTestsForProp(propertyName, propertyValue) {
+  return [
+    {
+      info: `${propertyName} is active on a grid container`,
+      property: propertyName,
+      tagName: "div",
+      rules: [`div { display:grid; ${propertyName}: ${propertyValue}; }`],
+      isActive: true,
+    },
+    {
+      info: `${propertyName} is inactive on a non-grid container`,
+      property: propertyName,
+      tagName: "div",
+      rules: [`div { ${propertyName}: ${propertyValue}; }`],
+      isActive: false,
+    },
+  ];
+}
+
+export default tests;