implement unit tests for macros

src/tests/macros/empty_image.rs

@@ -0,0 +1,14 @@
+//  ██████╗  █████╗ ███████╗███████╗██╗███╗   ██╗ ██████╗
+//  ██╔══██╗██╔══██╗██╔════╝██╔════╝██║████╗  ██║██╔════╝
+//  ██████╔╝███████║███████╗███████╗██║██╔██╗ ██║██║  ███╗
+//  ██╔═══╝ ██╔══██║╚════██║╚════██║██║██║╚██╗██║██║   ██║
+//  ██║     ██║  ██║███████║███████║██║██║ ╚████║╚██████╔╝
+//  ╚═╝     ╚═╝  ╚═╝╚══════╝╚══════╝╚═╝╚═╝  ╚═══╝ ╚═════╝
+
+#[cfg(test)]
+mod passing {
+    #[test]
+    fn contains_correct_image_data() {
+        assert_eq!(empty_image!(), "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA0AAAANCAQAAADY4iz3AAAAEUlEQVR42mNkwAkYR6UolgIACvgADsuK6xYAAAAASUVORK5CYII=");
+    }
+}

src/tests/macros/mod.rs

@@ -0,0 +1,2 @@
+mod empty_image;
+mod str;

src/tests/macros/str.rs

@@ -0,0 +1,24 @@
+//  ██████╗  █████╗ ███████╗███████╗██╗███╗   ██╗ ██████╗
+//  ██╔══██╗██╔══██╗██╔════╝██╔════╝██║████╗  ██║██╔════╝
+//  ██████╔╝███████║███████╗███████╗██║██╔██╗ ██║██║  ███╗
+//  ██╔═══╝ ██╔══██║╚════██║╚════██║██║██║╚██╗██║██║   ██║
+//  ██║     ██║  ██║███████║███████║██║██║ ╚████║╚██████╔╝
+//  ╚═╝     ╚═╝  ╚═╝╚══════╝╚══════╝╚═╝╚═╝  ╚═══╝ ╚═════╝
+
+#[cfg(test)]
+mod passing {
+    #[test]
+    fn returns_empty_string() {
+        assert_eq!(str!(), "");
+    }
+
+    #[test]
+    fn converts_integer_into_string() {
+        assert_eq!(str!(123), "123");
+    }
+
+    #[test]
+    fn converts_str_into_string() {
+        assert_eq!(str!("abc"), "abc");
+    }
+}

src/tests/mod.rs

@@ -2,4 +2,5 @@ mod cli;
 mod css;
 mod html;
 mod js;
+mod macros;
 mod utils;