Fix CI test stage

build.zig

@@ -1,9 +1,9 @@
 const std = @import("std");
 
-pub fn build(builder: *std.Build) void {
+pub fn build(b: *std.Build) void {
-	const coral_module = builder.createModule(.{.source_file = .{.path = "./source/coral/coral.zig"}});
+	const coral_module = b.createModule(.{.source_file = .{.path = "./source/coral/coral.zig"}});
 
-	const ona_module = builder.createModule(.{
+	const ona_module = b.createModule(.{
 		.source_file = .{.path = "./source/ona/ona.zig"},
 
 		.dependencies = &.{
@@ -14,13 +14,16 @@ pub fn build(builder: *std.Build) void {
 		},
 	});
 
-	// Ona Runner.
+	const cross_target = b.standardTargetOptions(.{});
+	const optimize_mode = std.builtin.Mode.Debug;
+
+	// Ona runner.
 	{
-		const ona_exe = builder.addExecutable(.{
+		const ona_exe = b.addExecutable(.{
 			.name = "ona-runner",
 			.root_source_file = .{.path = "./source/runner.zig"},
-			.target = builder.standardTargetOptions(.{}),
+			.target = cross_target,
-			.optimize = .Debug,
+			.optimize = optimize_mode,
 		});
 
 		ona_exe.addModule("coral", coral_module);
@@ -29,6 +32,19 @@ pub fn build(builder: *std.Build) void {
 		// ona_exe.addIncludeDir("./ext");
 		ona_exe.linkSystemLibrary("SDL2");
 		ona_exe.linkLibC();
-		builder.installArtifact(ona_exe);
+		b.installArtifact(ona_exe);
+	}
+
+	// Test step.
+	{
+		const exe_tests = b.addTest(.{
+			.root_source_file = .{.path = "source/test.zig"},
+			.target = cross_target,
+			.optimize = optimize_mode,
+		});
+
+		const test_step = b.step("test", "Run unit tests");
+
+		test_step.dependOn(&exe_tests.step);
 	}
 }

source/test.zig

@@ -0,0 +1,3 @@
+const _coral = @import("coral");
+
+const _ona = @import("ona");