diff --git a/.vscode/launch.json b/.vscode/launch.json
index 195c1f0..4476fb8 100755
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -2,13 +2,13 @@
 	"version": "0.2.0",
 	"configurations": [
 		{
-			"name": "Build",
+			"name": "Debug",
 			"type": "gdb",
 			"request": "launch",
 			"target": "${workspaceFolder}/zig-out/bin/ona",
 			"cwd": "${workspaceRoot}",
 			"valuesFormatting": "parseText",
-			"preLaunchTask": "Build",
+			"preLaunchTask": "Build Debug",
 		},
 		{
 			"name": "Test",
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 61ebf8f..c94af69 100755
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -3,7 +3,7 @@
 
 	"tasks": [
 		{
-			"label": "Build",
+			"label": "Build Debug",
 			"type": "shell",
 			"command": "zig build",
 
@@ -41,15 +41,6 @@
 				}
 			}
 		},
-		{
-			"label": "Test",
-			"type": "shell",
-			"command": "$(find zig-cache -name test) src/main.zig",
-			"group": {
-				"kind": "test",
-				"isDefault": true
-			},
-		},
 		{
 			"label": "Build Test",
 			"type": "shell",
diff --git a/build.zig b/build.zig
index f0a0a5b..89dc34a 100644
--- a/build.zig
+++ b/build.zig
@@ -10,39 +10,35 @@ pub fn build(builder: *std.build.Builder) void {
 
     // Engine executable.
     {
-        const engine_exe = builder.addExecutable("ona", "./src/engine/main.zig");
-        const oar_pkg = projectPkg("oar", &.{ona_pkg});
+        const exe = builder.addExecutable("engine", "./src/engine/main.zig");
 
-        engine_exe.addPackage(oar_pkg);
-        engine_exe.addPackage(ona_pkg);
-        engine_exe.setTarget(target);
-        engine_exe.setBuildMode(mode);
-        engine_exe.install();
-        engine_exe.addIncludeDir("./ext");
-        engine_exe.linkSystemLibrary("SDL2");
-        engine_exe.linkLibC();
-
-        const run_cmd = engine_exe.run();
-
-        run_cmd.step.dependOn(builder.getInstallStep());
-
-        if (builder.args) |args| run_cmd.addArgs(args);
-
-        builder.step("run", "Run Ona application").dependOn(&run_cmd.step);
+        exe.addPackage(projectPkg("oar", &.{ona_pkg}));
+        exe.addPackage(ona_pkg);
+        exe.setTarget(target);
+        exe.setBuildMode(mode);
+        exe.install();
+        exe.addIncludeDir("./ext");
+        exe.linkSystemLibrary("SDL2");
+        exe.linkLibC();
     }
 
     // Oar executable.
     {
+        const exe = builder.addExecutable("oar", "./src/oar/main.zig");
 
+        exe.addPackage(ona_pkg);
+        exe.setTarget(target);
+        exe.setBuildMode(mode);
+        exe.install();
     }
 
-    // Ona tests.
+    // Tests executable.
     {
-        const ona_tests = builder.addTestExe("test", "./src/main.zig");
+        const tests = builder.addTestExe("test", "./src/tests.zig");
 
-        ona_tests.setTarget(target);
-        ona_tests.setBuildMode(mode);
-        builder.step("test", "Run Ona unit tests").dependOn(&ona_tests.step);
+        tests.setTarget(target);
+        tests.setBuildMode(mode);
+        builder.step("test", "Run unit tests").dependOn(&tests.step);
     }
 }
 
diff --git a/src/engine/main.zig b/src/engine/main.zig
index 98a5af0..1dd0322 100644
--- a/src/engine/main.zig
+++ b/src/engine/main.zig
@@ -3,7 +3,7 @@ const std = @import("std");
 const sys = @import("./sys.zig");
 
 ///
-/// Entry point.
+/// Starts the the game engine.
 ///
 pub fn main() anyerror!void {
     return nosuspend await async sys.runGraphics(anyerror, run);
diff --git a/src/oar/main.zig b/src/oar/main.zig
index 98429ed..d5358fb 100644
--- a/src/oar/main.zig
+++ b/src/oar/main.zig
@@ -48,7 +48,7 @@ pub const Archive = struct {
             .header = find_header: {
                 var header = Entry.Header{
                     .revision = 0,
-                    .path = Path.empty,
+                    .path = std.mem.zeroes(Path),
                     .file_size = 0,
                     .absolute_offset = 0
                 };
@@ -161,9 +161,13 @@ pub const Entry = struct {
 pub const Path = extern struct {
     buffer: [255]u8,
     length: u8,
-
-    ///
-    ///
-    ///
-    pub const empty = std.mem.zeroes(Path);
 };
+
+///
+/// Starts the **O**na **Ar**chive packer utility.
+///
+pub fn main() u8 {
+    // TODO: Implement.
+
+    return 0;
+}
diff --git a/src/tests.zig b/src/tests.zig
new file mode 100644
index 0000000..0444b9e
--- /dev/null
+++ b/src/tests.zig
@@ -0,0 +1,5 @@
+test {
+    _ = @import("./engine/main.zig");
+    _ = @import("./oar/main.zig");
+    _ = @import("./ona/main.zig");
+}