test: Migrated custom test to proper test.

zmq_test.odin

@@ -16,6 +16,7 @@ test_version :: proc(t: ^testing.T) {
 
 @(test)
 test_connect_does_not_allocate_with_string_literals :: proc(t: ^testing.T) {
+	context.allocator = runtime.panic_allocator()
 	context.temp_allocator = runtime.panic_allocator()
 
 	ctx := ctx_new()
@@ -115,3 +116,34 @@ test_simple_const_echo :: proc(t: ^testing.T) {
 	}
 }
 
+@(test)
+test_duplicate_bind_fails :: proc(t: ^testing.T) {
+	ctx := ctx_new()
+	defer ctx_term(ctx)
+
+	rep1, serr := socket(ctx, .REP)
+	testing.expect_value(t, serr, nil)
+	if serr != nil {
+		testing.fail_now(t, "create first socket")
+	}
+	defer close(rep1)
+
+	if berr := bind(rep1, "inproc://duplicate"); berr != nil {
+		testing.expect_value(t, berr, nil)
+		testing.fail_now(t, "first bind should succeed")
+	}
+
+	rep2, cerr := socket(ctx, .REP)
+	testing.expect_value(t, cerr, nil)
+	if cerr != nil {
+		testing.fail_now(t, "create second socket")
+	}
+	defer close(rep2)
+
+	if berr := bind(rep2, "inproc://duplicate"); berr == nil {
+		testing.fail_now(t, "second bind to same endpoint should fail with EADDRINUSE")
+	} else {
+		testing.expect_value(t, berr, ZMQ_Error.EADDRINUSE)
+	}
+}
+