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diff --git a/tools/lint/eslint/eslint-plugin-mozilla/tests/globals.js b/tools/lint/eslint/eslint-plugin-mozilla/tests/globals.js
new file mode 100644
index 0000000000..80fa35f4a6
--- /dev/null
+++ b/tools/lint/eslint/eslint-plugin-mozilla/tests/globals.js
@@ -0,0 +1,161 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+var { getGlobalsForCode } = require("../lib/globals");
+var assert = require("assert");
+
+/* global describe, it */
+
+describe("globals", function() {
+  it("should reflect top-level this property assignment", function() {
+    const globals = getGlobalsForCode(`
+this.foo = 10;
+`);
+    assert.deepEqual(globals, [{ name: "foo", writable: true }]);
+  });
+
+  it("should reflect this property assignment inside block", function() {
+    const globals = getGlobalsForCode(`
+{
+  this.foo = 10;
+}
+`);
+    assert.deepEqual(globals, [{ name: "foo", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside function declaration", function() {
+    const globals = getGlobalsForCode(`
+function f() {
+  this.foo = 10;
+}
+`);
+    assert.deepEqual(globals, [{ name: "f", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside function expression", function() {
+    const globals = getGlobalsForCode(`
+(function f() {
+  this.foo = 10;
+});
+`);
+    assert.deepEqual(globals, []);
+  });
+
+  it("should ignore this property assignment inside method", function() {
+    const globals = getGlobalsForCode(`
+({
+  method() {
+    this.foo = 10;
+  }
+});
+`);
+    assert.deepEqual(globals, []);
+  });
+
+  it("should ignore this property assignment inside accessor", function() {
+    const globals = getGlobalsForCode(`
+({
+  get x() {
+    this.foo = 10;
+  },
+  set x(v) {
+    this.bar = 10;
+  }
+});
+`);
+    assert.deepEqual(globals, []);
+  });
+
+  it("should reflect this property assignment inside arrow function", function() {
+    const globals = getGlobalsForCode(`
+() => {
+  this.foo = 10;
+};
+`);
+    assert.deepEqual(globals, [{ name: "foo", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside arrow function inside function expression", function() {
+    const globals = getGlobalsForCode(`
+(function f() {
+  () => {
+    this.foo = 10;
+  };
+});
+`);
+    assert.deepEqual(globals, []);
+  });
+
+  it("should ignore this property assignment inside class static", function() {
+    const globals = getGlobalsForCode(`
+class A {
+  static {
+    this.foo = 10;
+    (() => {
+      this.bar = 10;
+    })();
+  }
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside class property", function() {
+    const globals = getGlobalsForCode(`
+class A {
+  a = this.foo = 10;
+  b = (() => {
+    this.bar = 10;
+  })();
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside class static property", function() {
+    const globals = getGlobalsForCode(`
+class A {
+  static a = this.foo = 10;
+  static b = (() => {
+    this.bar = 10;
+  })();
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside class private property", function() {
+    const globals = getGlobalsForCode(`
+class A {
+  #a = this.foo = 10;
+  #b = (() => {
+    this.bar = 10;
+  })();
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should ignore this property assignment inside class static private property", function() {
+    const globals = getGlobalsForCode(`
+class A {
+  static #a = this.foo = 10;
+  static #b = (() => {
+    this.bar = 10;
+  })();
+}
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true }]);
+  });
+
+  it("should reflect lazy getters", function() {
+    const globals = getGlobalsForCode(`
+ChromeUtils.defineESModuleGetters(this, {
+  A: "B",
+});
+`);
+    assert.deepEqual(globals, [{ name: "A", writable: true, explicit: true }]);
+  });
+});