Fix failure for lacked hostname

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ name: CI
 on: [push, pull_request]
 
 env:
-  HOSTNAME: ANYHOSTNAME
+
 
 jobs:
   build:

.vscode/launch.json

@@ -15,7 +15,7 @@
       "type": "lldb",
       "request": "launch",
       "name": "Debug Test",
-      "program": "${workspaceFolder}/zig-out/test-binary",
+      "program": "${workspaceFolder}/zig-out/bin/test",
       "preLaunchTask": "build_test",
       "args": [],
       "cwd": "${workspaceFolder}",

.vscode/tasks.json

@@ -15,6 +15,18 @@
             "label": "build_test",
             "type": "shell",
             "command": "zig",
+            "args": [
+                 "build",
+                "install",
+                "--summary",
+                "all"
+            ],
+            "group": "test"
+        },
+        {
+            "label": "build_test_org",
+            "type": "shell",
+            "command": "zig",
             "args": [
                 "test",
                 "${input:testFile}",

build.zig

@@ -59,6 +59,7 @@ pub fn build(b: *std.Build) void {
     lib_unit_tests.root_module.addImport("network", zig_network.module("network"));
     lib_unit_tests.root_module.addImport("zig-datetime", zig_datetime.module("zig-datetime"));
     lib_unit_tests.root_module.addImport("mailbox", mailbox.module("mailbox"));
+    b.installArtifact(lib_unit_tests);
 
     const run_lib_unit_tests = b.addRunArtifact(lib_unit_tests);
 

src/application.zig

@@ -65,9 +65,13 @@ pub const Application = struct {
 
         var fbAllocator = std.heap.FixedBufferAllocator.init(&buffer);
         const allocator = fbAllocator.allocator();
-        const hostName = std.process.getEnvVarOwned(allocator, envMame) catch "-";
+        var hostName = std.process.getEnvVarOwned(allocator, envMame) catch "";
 
-        defer allocator.free(hostName);
+        if (hostName.len == 0) {
+            hostName = "-";
+        } else {
+            defer allocator.free(hostName);
+        }
 
         _ = try appl.*.host_name.fillFrom(hostName);