added unit tests for makeDatasetSlugToReadableNameFilter

test/unit/makeDatasetSlugToReadableNameFilter.test.js

@@ -1 +1,31 @@
-// ToDo
+// makeDatasetSlugToReadableNameFilter.test.js
+import { vi, it, describe, expect } from 'vitest'
+import logger from '../../src/utils/logger.js'
+import { makeDatasetSlugToReadableNameFilter } from '../../src/filters/makeDatasetSlugToReadableNameFilter'
+
+describe('makeDatasetSlugToReadableNameFilter', () => {
+  const datasetNameMapping = new Map([
+    ['dataset-slug-1', 'Dataset 1'],
+    ['dataset-slug-2', 'Dataset 2']
+  ])
+
+  const filter = makeDatasetSlugToReadableNameFilter(datasetNameMapping)
+
+  it('returns a function that takes a dataset slug and returns its corresponding readable name', () => {
+    expect(filter('dataset-slug-1')).toBe('Dataset 1')
+    expect(filter('dataset-slug-2')).toBe('Dataset 2')
+  })
+
+  it('returns the original slug if it is not found in the dataset name mapping', () => {
+    expect(filter('unknown-slug')).toBe('unknown-slug')
+  })
+
+  it('logs an error if the provided slug is not found in the dataset name mapping', () => {
+    const loggerErrorSpy = vi.spyOn(logger, 'error')
+
+    filter('unknown-slug')
+
+    expect(loggerErrorSpy).toHaveBeenCalledTimes(1)
+    expect(loggerErrorSpy).toHaveBeenCalledWith('can\'t find a name for unknown-slug')
+  })
+})