tests: Test default values

src/zpinner.zig

@@ -118,3 +118,39 @@ const Zpinner = struct {
         }
     }
 };
+
+test "empty options struct contains default delay value" {
+    const expectedValue = std.time.ns_per_s * 0.1;
+
+    const defaultOptions = Options{};
+
+    try std.testing.expectEqual(@as(u64, defaultOptions.delay), @as(u64, expectedValue));
+}
+test "empty options struct contains default snake charset" {
+    const expectedValue = chars.Snake;
+
+    const opts = Options{};
+
+    try std.testing.expectEqual(opts.chars, expectedValue);
+}
+test "empty options struct contains default empty prefix" {
+    const expectedValue = "";
+
+    const opts = Options{};
+
+    try std.testing.expectEqual(opts.prefix, expectedValue);
+}
+test "empty options struct contains default empty suffix" {
+    const expectedValue = "";
+
+    const opts = Options{};
+
+    try std.testing.expectEqual(opts.suffix, expectedValue);
+}
+test "empty options struct contains default style default" {
+    const expectedValue = Style{ .foreground = Color.Default, .background = Color.Default };
+
+    const opts = Options{};
+
+    try std.testing.expectEqual(opts.style, expectedValue);
+}