diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
index 15832ed44668..96a4ae983786 100644
--- a/lib/kunit/executor.c
+++ b/lib/kunit/executor.c
@@ -19,7 +19,7 @@ MODULE_PARM_DESC(filter_glob,
 		"Filter which KUnit test suites run at boot-time, e.g. list*");
 
 static struct kunit_suite * const *
-kunit_filter_subsuite(struct kunit_suite * const * const subsuite)
+kunit_filter_subsuite(struct kunit_suite * const * const subsuite, const char *filter_glob)
 {
 	int i, n = 0;
 	struct kunit_suite **filtered;
@@ -52,19 +52,14 @@ struct suite_set {
 	struct kunit_suite * const * const *end;
 };
 
-static struct suite_set kunit_filter_suites(void)
+static struct suite_set kunit_filter_suites(const struct suite_set *suite_set,
+					    const char *filter_glob)
 {
 	int i;
 	struct kunit_suite * const **copy, * const *filtered_subsuite;
 	struct suite_set filtered;
 
-	const size_t max = __kunit_suites_end - __kunit_suites_start;
-
-	if (!filter_glob) {
-		filtered.start = __kunit_suites_start;
-		filtered.end = __kunit_suites_end;
-		return filtered;
-	}
+	const size_t max = suite_set->end - suite_set->start;
 
 	copy = kmalloc_array(max, sizeof(*filtered.start), GFP_KERNEL);
 	filtered.start = copy;
@@ -74,7 +69,7 @@ static struct suite_set kunit_filter_suites(void)
 	}
 
 	for (i = 0; i < max; ++i) {
-		filtered_subsuite = kunit_filter_subsuite(__kunit_suites_start[i]);
+		filtered_subsuite = kunit_filter_subsuite(suite_set->start[i], filter_glob);
 		if (filtered_subsuite)
 			*copy++ = filtered_subsuite;
 	}
@@ -98,8 +93,13 @@ static void kunit_print_tap_header(struct suite_set *suite_set)
 int kunit_run_all_tests(void)
 {
 	struct kunit_suite * const * const *suites;
+	struct suite_set suite_set = {
+		.start = __kunit_suites_start,
+		.end = __kunit_suites_end,
+	};
 
-	struct suite_set suite_set = kunit_filter_suites();
+	if (filter_glob)
+		suite_set = kunit_filter_suites(&suite_set, filter_glob);
 
 	kunit_print_tap_header(&suite_set);
 
@@ -115,4 +115,8 @@ int kunit_run_all_tests(void)
 	return 0;
 }
 
+#if IS_BUILTIN(CONFIG_KUNIT_TEST)
+#include "executor_test.c"
+#endif
+
 #endif /* IS_BUILTIN(CONFIG_KUNIT) */
diff --git a/lib/kunit/executor_test.c b/lib/kunit/executor_test.c
new file mode 100644
index 000000000000..8e925395beeb
--- /dev/null
+++ b/lib/kunit/executor_test.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KUnit test for the KUnit executor.
+ *
+ * Copyright (C) 2021, Google LLC.
+ * Author: Daniel Latypov <dlatypov@google.com>
+ */
+
+#include <kunit/test.h>
+
+static void kfree_at_end(struct kunit *test, const void *to_free);
+static struct kunit_suite *alloc_fake_suite(struct kunit *test,
+					    const char *suite_name);
+
+static void filter_subsuite_test(struct kunit *test)
+{
+	struct kunit_suite *subsuite[3] = {NULL, NULL, NULL};
+	struct kunit_suite * const *filtered;
+
+	subsuite[0] = alloc_fake_suite(test, "suite1");
+	subsuite[1] = alloc_fake_suite(test, "suite2");
+
+	/* Want: suite1, suite2, NULL -> suite2, NULL */
+	filtered = kunit_filter_subsuite(subsuite, "suite2*");
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filtered);
+	kfree_at_end(test, filtered);
+
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filtered[0]);
+	KUNIT_EXPECT_STREQ(test, (const char *)filtered[0]->name, "suite2");
+
+	KUNIT_EXPECT_FALSE(test, filtered[1]);
+}
+
+static void filter_subsuite_to_empty_test(struct kunit *test)
+{
+	struct kunit_suite *subsuite[3] = {NULL, NULL, NULL};
+	struct kunit_suite * const *filtered;
+
+	subsuite[0] = alloc_fake_suite(test, "suite1");
+	subsuite[1] = alloc_fake_suite(test, "suite2");
+
+	filtered = kunit_filter_subsuite(subsuite, "not_found");
+	kfree_at_end(test, filtered); /* just in case */
+
+	KUNIT_EXPECT_FALSE_MSG(test, filtered,
+			       "should be NULL to indicate no match");
+}
+
+static void kfree_subsuites_at_end(struct kunit *test, struct suite_set *suite_set)
+{
+	struct kunit_suite * const * const *suites;
+
+	for (suites = suite_set->start; suites < suite_set->end; suites++)
+		kfree_at_end(test, *suites);
+}
+
+static void filter_suites_test(struct kunit *test)
+{
+	/* Suites per-file are stored as a NULL terminated array */
+	struct kunit_suite *subsuites[2][2] = {
+		{NULL, NULL},
+		{NULL, NULL},
+	};
+	/* Match the memory layout of suite_set */
+	struct kunit_suite * const * const suites[2] = {
+		subsuites[0], subsuites[1],
+	};
+
+	const struct suite_set suite_set = {
+		.start = suites,
+		.end = suites + 2,
+	};
+	struct suite_set filtered = {.start = NULL, .end = NULL};
+
+	/* Emulate two files, each having one suite */
+	subsuites[0][0] = alloc_fake_suite(test, "suite0");
+	subsuites[1][0] = alloc_fake_suite(test, "suite1");
+
+	/* Filter out suite1 */
+	filtered = kunit_filter_suites(&suite_set, "suite0");
+	kfree_subsuites_at_end(test, &filtered); /* let us use ASSERTs without leaking */
+	KUNIT_ASSERT_EQ(test, filtered.end - filtered.start, (ptrdiff_t) 1);
+
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filtered.start);
+	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, filtered.start[0]);
+	KUNIT_EXPECT_PTR_EQ(test, filtered.start[0][0], subsuites[0][0]);
+}
+
+static struct kunit_case executor_test_cases[] = {
+	KUNIT_CASE(filter_subsuite_test),
+	KUNIT_CASE(filter_subsuite_to_empty_test),
+	KUNIT_CASE(filter_suites_test),
+	{}
+};
+
+static struct kunit_suite executor_test_suite = {
+	.name = "kunit_executor_test",
+	.test_cases = executor_test_cases,
+};
+
+kunit_test_suites(&executor_test_suite);
+
+/* Test helpers */
+
+static void kfree_res_free(struct kunit_resource *res)
+{
+	kfree(res->data);
+}
+
+/* Use the resource API to register a call to kfree(to_free).
+ * Since we never actually use the resource, it's safe to use on const data.
+ */
+static void kfree_at_end(struct kunit *test, const void *to_free)
+{
+	/* kfree() handles NULL already, but avoid allocating a no-op cleanup. */
+	if (IS_ERR_OR_NULL(to_free))
+		return;
+	kunit_alloc_and_get_resource(test, NULL, kfree_res_free, GFP_KERNEL,
+				     (void *)to_free);
+}
+
+static struct kunit_suite *alloc_fake_suite(struct kunit *test,
+					    const char *suite_name)
+{
+	struct kunit_suite *suite;
+
+	/* We normally never expect to allocate suites, hence the non-const cast. */
+	suite = kunit_kzalloc(test, sizeof(*suite), GFP_KERNEL);
+	strncpy((char *)suite->name, suite_name, sizeof(suite->name));
+
+	return suite;
+}
