diff --git a/markdown/emoji_test.odin b/markdown/emoji_test.odin
new file mode 100644
index 0000000..17ea701
--- /dev/null
+++ b/markdown/emoji_test.odin
@@ -0,0 +1,36 @@
+#+test
+package markdown
+
+import "core:testing"
+
+@(test)
+test_basic_expansion :: proc(t: ^testing.T) {
+	testing.expect_value(t, expand_emoji(":smile:"), "😄")
+	testing.expect_value(t, expand_emoji(":smile: :heart:"), "😄 ❤️")
+	testing.expect_value(t, expand_emoji(":smile::heart:"), "😄❤️")
+	testing.expect_value(t, expand_emoji("Hello :wave:!"), "Hello 👋!")
+	testing.expect_value(t, expand_emoji(":smile: rest"), "😄 rest")
+	testing.expect_value(t, expand_emoji("rest :smile:"), "rest 😄")
+}
+
+@(test)
+test_no_match :: proc(t: ^testing.T) {
+	testing.expect_value(t, expand_emoji("Hello world"), "Hello world")
+	testing.expect_value(t, expand_emoji("Hello:"), "Hello:")
+	testing.expect_value(t, expand_emoji(":notreal:"), ":notreal:")
+	testing.expect_value(t, expand_emoji("http://example.com"), "http://example.com")
+	testing.expect_value(t, expand_emoji(""), "")
+}
+
+@(test)
+test_invalid_shortcodes :: proc(t: ^testing.T) {
+	testing.expect_value(t, expand_emoji("::"), "::")
+	testing.expect_value(t, expand_emoji(":Smile:"), ":Smile:")
+	testing.expect_value(t, expand_emoji(": not real :"), ": not real :")
+}
+
+@(test)
+test_valid_formats :: proc(t: ^testing.T) {
+	testing.expect_value(t, expand_emoji(":100:"), "💯")
+	testing.expect_value(t, expand_emoji(":stuck_out_tongue:"), "😛")
+}