tests/kernel: Validate constructor execution order

Check the order of constructors, making sure those with a specified
priority are called in numeric order after which those without priority are
called.

Signed-off-by: Keith Packard <[email protected]>

tests/kernel/common/src/constructor.c

@@ -18,21 +18,37 @@
  *
  */
 
-static int constructor_value;
+static int constructor_number;
+static int constructor_values[3];
 
-#define CONSTRUCTOR_VALUE	1
+void __attribute__((__constructor__)) __constructor_init(void)
+{
+	constructor_values[constructor_number++] = 31415;
+}
+
+void __attribute__((__constructor__(101))) __constructor_init_priority_101(void)
+{
+	constructor_values[constructor_number++] = 101;
+}
 
-void
-__attribute__((__constructor__))
-__constructor_init(void)
+void __attribute__((__constructor__(1000))) __constructor_init_priority_1000(void)
 {
-	constructor_value = CONSTRUCTOR_VALUE;
+	constructor_values[constructor_number++] = 1000;
 }
 
 ZTEST(constructor, test_constructor)
 {
-	zassert_equal(constructor_value, CONSTRUCTOR_VALUE,
-		      "constructor test failed: constructor not called");
+	zassert_equal(constructor_number, 3,
+		      "constructor test failed: constructor missing");
+	zassert_equal(constructor_values[0], 101,
+		      "constructor priority test failed:"
+		      "constructor 101 not called first");
+	zassert_equal(constructor_values[1], 1000,
+		      "constructor priority test failed:"
+		      "constructor 1000 not called second");
+	zassert_equal(constructor_values[2], 31415,
+		      "constructor priority test failed:"
+		      "constructor without priority not called last");
 }
 
 extern void *common_setup(void);