test: add missing unit tests to utils (#292)

- add a few missing unit tests
- exclude generated ajv validators from code coverage metrics

Author: mnahkies

packages/openapi-code-generator/src/core/schemas/openapi-3.0-specification-validator.js

@@ -1,5 +1,7 @@
 /** AUTOGENERATED - DO NOT EDIT **/
 // @ts-nocheck
+/* istanbul ignore file */
+/* c8 ignore start */
 "use strict"
 module.exports = validate10
 module.exports.default = validate10
@@ -18759,3 +18761,4 @@ function validate10(
   validate10.errors = vErrors
   return errors === 0
 }
+/* c8 ignore end */

packages/openapi-code-generator/src/core/schemas/openapi-3.1-specification-validator.js

@@ -1,5 +1,7 @@
 /** AUTOGENERATED - DO NOT EDIT **/
 // @ts-nocheck
+/* istanbul ignore file */
+/* c8 ignore start */
 
 "use strict"
 const {logger} = require("../logger")
@@ -12,3 +14,5 @@ function validate() {
   )
   return true
 }
+
+/* c8 ignore end */

packages/openapi-code-generator/src/core/utils.spec.ts

@@ -2,14 +2,50 @@ import {describe, expect, it} from "@jest/globals"
 import {
   camelCase,
   coalesce,
+  hasSingleElement,
+  isDefined,
+  isHttpMethod,
   kebabCase,
   mediaTypeToIdentifier,
   normalizeFilename,
   snakeCase,
   titleCase,
+  upperFirst,
 } from "./utils"
 
 describe("core/utils", () => {
+  describe("#isDefined", () => {
+    it.each([
+      ["", true],
+      [0, true],
+      [false, true],
+      [null, true],
+      [undefined, false],
+    ])("%s -> %s", (input, expected) => {
+      expect(isDefined(input)).toBe(expected)
+    })
+  })
+
+  describe("#hasSingleElement", () => {
+    it.each([
+      [[], false],
+      [[1], true],
+      [[1, 2], false],
+    ])("%s -> %s", (input, expected) => {
+      expect(hasSingleElement(input)).toBe(expected)
+    })
+  })
+
+  describe("#isHttpMethod", () => {
+    it.each([
+      ["GET", true],
+      ["post", true],
+      ["random", false],
+    ])("%s -> %s", (input, expected) => {
+      expect(isHttpMethod(input)).toBe(expected)
+    })
+  })
+
   describe("#coalesce", () => {
     it("returns the first defined parameter", () => {
       expect(coalesce(null, undefined, 1, 2)).toBe(1)
@@ -32,11 +68,37 @@ describe("core/utils", () => {
       ["single", "Single"],
       ["two words", "TwoWords"],
       ["camelCase", "CamelCase"],
+      ["pipe-case", "PipeCase"],
+      ["snake_case", "SnakeCase"],
     ])("%s -> %s", (input, expected) => {
       expect(titleCase(input)).toBe(expected)
     })
   })
 
+  describe("#camelCase", () => {
+    it.each([
+      ["single", "single"],
+      ["two words", "twoWords"],
+      ["camelCase", "camelCase"],
+      ["pipe-case", "pipeCase"],
+      ["snake_case", "snakeCase"],
+    ])("%s -> %s", (input, expected) => {
+      expect(camelCase(input)).toBe(expected)
+    })
+  })
+
+  describe("#upperFirst", () => {
+    it.each([
+      ["single", "Single"],
+      ["two words", "Two words"],
+      ["camelCase", "CamelCase"],
+      ["pipe-case", "Pipe-case"],
+      ["snake_case", "Snake_case"],
+    ])("%s -> %s", (input, expected) => {
+      expect(upperFirst(input)).toBe(expected)
+    })
+  })
+
   describe("#normalizeFilename", () => {
     const cases = [
       {

scripts/generate-ajv-validator.js

@@ -33,7 +33,10 @@ const writeOutput = async (filepath, moduleCode) => {
   const raw = `
     /** AUTOGENERATED - DO NOT EDIT **/
     // @ts-nocheck
+    /* istanbul ignore file */
+    /* c8 ignore start */
     ${moduleCode}
+    /* c8 ignore end */
   `
 
   const biome = await Biome.create({