Add test coverage

glean-core/android/src/test/java/mozilla/telemetry/glean/GleanTest.kt

@@ -156,6 +156,29 @@ class GleanTest {
         assertEquals("value", storedData.extra?.getValue("test_key"))
     }
 
+    @Test
+    fun `test experiments recording before Glean inits`() {
+        // This test relies on Glean not being initialized and task queuing to be on.
+        Glean.testDestroyGleanHandle()
+        Dispatchers.API.setTaskQueueing(true)
+
+        Glean.setExperimentActive(
+            "experiment_set_preinit", "branch_a"
+        )
+
+        Glean.setExperimentActive(
+            "experiment_preinit_disabled", "branch_a"
+        )
+
+        Glean.setExperimentInactive("experiment_preinit_disabled")
+
+        // This will init glean and flush the dispatcher's queue.
+        resetGlean()
+
+        assertTrue(Glean.testIsExperimentActive("experiment_set_preinit"))
+        assertFalse(Glean.testIsExperimentActive("experiment_preinit_disabled"))
+    }
+
     @Test
     fun `test sending of background pings`() {
         val server = getMockWebServer()

glean-core/python/tests/test_glean.py

@@ -105,6 +105,23 @@ def test_experiments_recording():
     assert "value" == stored_data.extra["test_key"]
 
 
+def test_experiments_recording_before_glean_inits():
+    # This test relies on Glean not being initialized and task
+    # queuing to be on.
+    Glean.reset()
+
+    Glean.set_experiment_active("experiment_set_preinit", "branch_a")
+    Glean.set_experiment_active("experiment_preinit_disabled", "branch_a")
+
+    Glean.set_experiment_inactive("experiment_preinit_disabled")
+
+    # This will init Glean and flush the dispatcher's queue.
+    Glean.initialize(GLEAN_APP_ID, glean_version)
+
+    assert Glean.test_is_experiment_active("experiment_set_preinit")
+    assert not Glean.test_is_experiment_active("experiment_preinit_disabled")
+
+
 @pytest.mark.skip
 def test_sending_of_background_pings():
     pass