1 files changed, 15 insertions, 0 deletions
diff --git a/packages/excalidraw/mermaid.test.ts b/packages/excalidraw/mermaid.test.ts
new file mode 100644
index 0000000..2a67463
--- /dev/null
+++ b/packages/excalidraw/mermaid.test.ts
@@ -0,0 +1,15 @@
+import { isMaybeMermaidDefinition } from "./mermaid";
+
+describe("isMaybeMermaidDefinition", () => {
+  it("should return true for a valid mermaid definition", () => {
+    expect(isMaybeMermaidDefinition("flowchart")).toBe(true);
+    expect(isMaybeMermaidDefinition("flowchart LR")).toBe(true);
+    expect(isMaybeMermaidDefinition("flowchart LR\nola")).toBe(true);
+    expect(isMaybeMermaidDefinition("%%{}%%flowchart")).toBe(true);
+    expect(isMaybeMermaidDefinition("%%{}%% flowchart")).toBe(true);
+
+    expect(isMaybeMermaidDefinition("graphs")).toBe(false);
+    expect(isMaybeMermaidDefinition("this flowchart")).toBe(false);
+    expect(isMaybeMermaidDefinition("this\nflowchart")).toBe(false);
+  });
+});