tests: unit: util: Add tests for COND_CASE_1

Add test cases for the COND_CASE_1 macro.

Signed-off-by: Pieter De Gendt <[email protected]>

Author: pdgendt

tests/unit/util/main.c

@@ -165,6 +165,38 @@ ZTEST(util, test_COND_CODE_0) {
 	zassert_true((y3 == 1));
 }
 
+ZTEST(util, test_COND_CASE_1) {
+	/* Intentionally undefined symbols used to verify that only the selected
+	 * branch expands.
+	 */
+	#define CASE_TRUE 1
+	#define CASE_FALSE 0
+
+	int prioritized = COND_CASE_1(
+		CASE_TRUE, (42),
+		CASE_TRUE, (COND_CASE_1_SHOULD_NOT_REACH_SECOND_TRUE_CASE),
+		(0));
+	zexpect_equal(prioritized, 42);
+
+	int selected = COND_CASE_1(
+		CASE_FALSE, (COND_CASE_1_SHOULD_NOT_USE_FIRST_CASE),
+		CASE_TRUE, (7),
+		(11));
+	zexpect_equal(selected, 7);
+
+	int fallback = COND_CASE_1(
+		CASE_FALSE, (COND_CASE_1_SHOULD_NOT_USE_SECOND_CASE),
+		CASE_FALSE, (COND_CASE_1_SHOULD_NOT_USE_THIRD_CASE),
+		(5));
+	zexpect_equal(fallback, 5);
+
+	int only_default = COND_CASE_1((9));
+	zexpect_equal(only_default, 9);
+
+	#undef CASE_TRUE
+	#undef CASE_FALSE
+}
+
 #undef ZERO
 #undef SEVEN
 #undef A_BUILD_ERROR