test: Migrated custom test to proper test.

test_error/main.odin

@@ -1,28 +0,0 @@
-package main
-
-import "core:fmt"
-import "core:os"
-import zmq "../"
-
-main :: proc() {
-	ctx := zmq.ctx_new()
-	defer zmq.ctx_term(ctx)
-
-	rep1, _ := zmq.socket(ctx, .REP)
-	defer zmq.close(rep1)
-	zmq.bind(rep1, "tcp://*:5555")
-
-	rep2, _ := zmq.socket(ctx, .REP)
-	defer zmq.close(rep2)
-	if err := zmq.bind(rep2, "tcp://*:5555"); err != nil {
-		fmt.eprintfln("bind failed: %s", zmq.strerror(err))
-		switch e in err {
-		case zmq.ZMQ_Error:
-			fmt.eprintfln("  variant: ZMQ_Error, member: %v", e)
-		case os.Platform_Error:
-			fmt.eprintfln("  variant: Platform_Error, member: %v", e)
-		case:
-			fmt.eprintfln("  variant: nil")
-		}
-	}
-}

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)
+	}
+}
+