test: add decimal

build.zig

@@ -46,7 +46,7 @@ pub fn build(b: *std.Build) void {
     test_options.addOptionPath("exe_path", exe.getEmittedBin());
 
     const integration_tests = b.addTest(.{
-        .root_source_file = b.path("tests/cli.zig"),
+        .root_source_file = b.path("test/cli.zig"),
         .target = target,
         .optimize = optimize,
     });

tests/cli.zig → test/cli.zig

@@ -48,3 +48,19 @@ test "crypto" {
 
     try std.testing.expectEqual(term, std.process.Child.Term{ .Exited = 0 });
 }
+
+test "decimal" {
+    const exe_path = build_options.exe_path;
+    const argv = [_][]const u8{ exe_path, "--time=short", "--decimal" };
+    const proc = try std.process.Child.run(.{
+        .allocator = std.testing.allocator,
+        .argv = &argv,
+    });
+
+    defer std.testing.allocator.free(proc.stdout);
+    defer std.testing.allocator.free(proc.stderr);
+
+    const term = proc.term;
+
+    try std.testing.expectEqual(term, std.process.Child.Term{ .Exited = 0 });
+}