Validate basic expressions

packages/builder/src/components/common/CodeEditor/validator/tests/hbs.spec.ts

@@ -16,4 +16,60 @@ describe("hbs validator", () => {
     const result = validateHbsTemplate(text, validators)
     expect(result).toHaveLength(0)
   })
+
+  describe("basic expressions", () => {
+    const validators = {
+      fieldName: {},
+    }
+
+    it("can validate valid expressions", () => {
+      const text = "{{ fieldName }}"
+
+      const result = validateHbsTemplate(text, validators)
+      expect(result).toHaveLength(0)
+    })
+
+    it("can validate invalid expressions", () => {
+      const text = "{{ anotherFieldName }}"
+
+      const result = validateHbsTemplate(text, validators)
+      expect(result).toEqual([
+        {
+          from: 0,
+          message: `"anotherFieldName" handler does not exist.`,
+          severity: "warning",
+          to: 22,
+        },
+      ])
+    })
+
+    it("can validate untrimmed invalid expressions", () => {
+      const text = "    {{ anotherFieldName }}"
+
+      const result = validateHbsTemplate(text, validators)
+      expect(result).toEqual([
+        {
+          from: 4,
+          message: `"anotherFieldName" handler does not exist.`,
+          severity: "warning",
+          to: 26,
+        },
+      ])
+    })
+
+    it("can validate invalid expressions between valid lines", () => {
+      const text =
+        "literal expression\nthe value is {{ anotherFieldName }}\nanother expression"
+
+      const result = validateHbsTemplate(text, validators)
+      expect(result).toEqual([
+        {
+          from: 32,
+          message: `"anotherFieldName" handler does not exist.`,
+          severity: "warning",
+          to: 54,
+        },
+      ])
+    })
+  })
 })