Move frontmatter extraction from renderer to redux (#1413)

src/components/common/note-frontmatter/extract-frontmatter.test.ts

@@ -0,0 +1,94 @@
+/*
+ * SPDX-FileCopyrightText: 2021 The HedgeDoc developers (see AUTHORS file)
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { extractFrontmatter } from './extract-frontmatter'
+import { PresentFrontmatterExtractionResult } from './types'
+
+describe('frontmatter extraction', () => {
+  describe('frontmatterPresent property', () => {
+    it('is false when note does not contain three dashes at all', () => {
+      const testNote = 'abcdef\nmore text'
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction.frontmatterPresent).toBe(false)
+    })
+    it('is false when note does not start with three dashes', () => {
+      const testNote = '\n---\nthis is not frontmatter'
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction.frontmatterPresent).toBe(false)
+    })
+    it('is false when note start with less than three dashes', () => {
+      const testNote = '--\nthis is not frontmatter'
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction.frontmatterPresent).toBe(false)
+    })
+    it('is false when note starts with three dashes but contains other characters in the same line', () => {
+      const testNote = '--- a\nthis is not frontmatter'
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction.frontmatterPresent).toBe(false)
+    })
+    it('is false when note has no ending marker for frontmatter', () => {
+      const testNote = '---\nthis is not frontmatter\nbecause\nthere is no\nend marker'
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction.frontmatterPresent).toBe(false)
+    })
+    it('is false when note end marker is present but with not the same amount of dashes as start marker', () => {
+      const testNote = '---\nthis is not frontmatter\n----\ncontent'
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction.frontmatterPresent).toBe(false)
+    })
+    it('is true when note end marker is present with the same amount of dashes as start marker', () => {
+      const testNote = '---\nthis is frontmatter\n---\ncontent'
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction.frontmatterPresent).toBe(true)
+    })
+    it('is true when note end marker is present with the same amount of dashes as start marker but without content', () => {
+      const testNote = '---\nthis is frontmatter\n---'
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction.frontmatterPresent).toBe(true)
+    })
+    it('is true when note end marker is present with the same amount of dots as start marker', () => {
+      const testNote = '---\nthis is frontmatter\n...\ncontent'
+      const extraction = extractFrontmatter(testNote)
+      expect(extraction.frontmatterPresent).toBe(true)
+    })
+  })
+
+  describe('frontmatterLines property', () => {
+    it('is correct for single line frontmatter without content', () => {
+      const testNote = '---\nsingle line frontmatter\n...'
+      const extraction = extractFrontmatter(testNote) as PresentFrontmatterExtractionResult
+      expect(extraction.frontmatterLines).toEqual(3)
+    })
+    it('is correct for single line frontmatter with content', () => {
+      const testNote = '---\nsingle line frontmatter\n...\ncontent'
+      const extraction = extractFrontmatter(testNote) as PresentFrontmatterExtractionResult
+      expect(extraction.frontmatterLines).toEqual(3)
+    })
+    it('is correct for multi-line frontmatter without content', () => {
+      const testNote = '---\nabc\n123\ndef\n...'
+      const extraction = extractFrontmatter(testNote) as PresentFrontmatterExtractionResult
+      expect(extraction.frontmatterLines).toEqual(5)
+    })
+    it('is correct for multi-line frontmatter with content', () => {
+      const testNote = '---\nabc\n123\ndef\n...\ncontent'
+      const extraction = extractFrontmatter(testNote) as PresentFrontmatterExtractionResult
+      expect(extraction.frontmatterLines).toEqual(5)
+    })
+  })
+
+  describe('rawFrontmatterText property', () => {
+    it('contains single-line frontmatter text', () => {
+      const testNote = '---\nsingle-line\n...\ncontent'
+      const extraction = extractFrontmatter(testNote) as PresentFrontmatterExtractionResult
+      expect(extraction.rawFrontmatterText).toEqual('single-line')
+    })
+    it('contains multi-line frontmatter text', () => {
+      const testNote = '---\nmulti\nline\n...\ncontent'
+      const extraction = extractFrontmatter(testNote) as PresentFrontmatterExtractionResult
+      expect(extraction.rawFrontmatterText).toEqual('multi\nline')
+    })
+  })
+})