fix example tests

build.zig

@@ -38,7 +38,9 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
 
+    const run_example_tests = b.addRunArtifact(example_tests);
+
     const test_step = b.step("test", "Run unit tests");
     test_step.dependOn(&run_exe_unit_tests.step);
-    test_step.dependOn(&example_tests.step);
+    test_step.dependOn(&run_example_tests.step);
 }