Added a test files and ammended the Makefile to add a tests target

Makefile

@@ -1,4 +1,4 @@
-.PHONY: all fast clean help
+.PHONY: all fast clean tests help
 
 # Default target: full build with search index
 all:
@@ -15,10 +15,15 @@ clean:
 	@echo "Cleaning output directory..."
 	rm -rf output/
 
+tests:
+	@echo "Running all the tests..."
+	emacs -batch -l ert -l tests/macros-tests.el -f ert-run-tests-batch-and-exit
+
 # Show help message
 help:
 	@echo "Available targets:"
 	@echo "  make        - Full rebuild (with search index)"
 	@echo "  make fast   - Fast rebuild (without search index)"
 	@echo "  make clean  - Remove output directory"
+	@echo "  make tests  - Run all of the tests associated with the project"
 	@echo "  make help   - Show this help message"

tests/build-tests.el

@@ -0,0 +1 @@
+(require 'ert)

tests/macros-tests.el

@@ -0,0 +1,59 @@
+(require 'ert)
+(require 'ox-html)
+(load-file "~/master-folder/org_files/org_roam/macros.el")
+
+(defun helper/org-export-html (org-content)
+  "Export ORG-CONTENT string to HTML and return the result."
+  (with-temp-buffer
+    (insert org-content)
+    (org-mode)
+    (org-export-as 'html nil nil t)))
+
+
+(ert-deftest test/org-macro-sidenote ()
+  (let ((html (helper/org-export-html
+               "Here is a sidenote {{{sidenote(This is a note)}}}."))
+	(expected "<span class=\"sidenote\">This is a note</span>")
+	)
+    (should
+     (string-match-p expected html))))
+
+(ert-deftest test/org-macro-epigraph-single ()
+  (let ((html (helper/org-export-html
+               "{{{epigraph_single(To be is to do.,Socrates)}}}")))
+    (should
+     (string-match-p
+      "<blockquote class=\"epigraph\">"
+      html))
+    (should
+     (string-match-p
+      "<p>To be is to do\\.</p>"
+      html))
+    (should
+     (string-match-p
+      "<footer>Socrates</footer>"
+      html))))
+
+(ert-deftest test/org-macro-epigraph-multiline ()
+  (let ((html (helper/org-export-html
+               "{{{epigraph(<p>Line one.</p><p>Line two.</p>)}}}")))
+    (should
+     (string-match-p
+      "<blockquote class=\"epigraph\">"
+      html))
+    (should
+     (string-match-p
+      "Line one\\."
+      html))
+    (should
+     (string-match-p
+      "Line two\\."
+      html))))
+
+(ert-deftest test/org-macro-newthought ()
+  (let ((html (helper/org-export-html
+               "{{{newthought(Attention)}}} is important.")))
+    (should
+     (string-match-p
+      "<span class=\"newthought\">Attention</span>"
+      html))))