Revert "test: remove standalone options test"

This reverts commit d9cd4d0.

Turns out Jacob restored this test as part of test-cli in cdba1d5.

Author: alexrp

test/standalone/options/build.zig

@@ -0,0 +1,21 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const main = b.addTest(.{ .root_module = b.createModule(.{
+        .root_source_file = b.path("src/main.zig"),
+        .target = b.graph.host,
+        .optimize = .Debug,
+    }) });
+
+    const options = b.addOptions();
+    main.root_module.addOptions("build_options", options);
+    options.addOption(bool, "bool_true", b.option(bool, "bool_true", "t").?);
+    options.addOption(bool, "bool_false", b.option(bool, "bool_false", "f").?);
+    options.addOption(u32, "int", b.option(u32, "int", "i").?);
+    const E = enum { one, two, three };
+    options.addOption(E, "e", b.option(E, "e", "e").?);
+    options.addOption([]const u8, "string", b.option([]const u8, "string", "s").?);
+
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&b.addRunArtifact(main).step);
+}

test/standalone/options/src/main.zig

@@ -0,0 +1,12 @@
+const std = @import("std");
+const assert = std.debug.assert;
+
+const build_options = @import("build_options");
+
+test "build options" {
+    comptime assert(build_options.bool_true);
+    comptime assert(!build_options.bool_false);
+    comptime assert(build_options.int == 1234);
+    comptime assert(build_options.e == .two);
+    comptime assert(std.mem.eql(u8, build_options.string, "hello"));
+}