diff --git a/server/finders/bookFinder.test.js b/server/finders/bookFinder.test.js
new file mode 100644
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+++ b/server/finders/bookFinder.test.js
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+const bookFinder = require('./BookFinder')
+
+describe('TitleCandidates with author', () => {
+  let titleCandidates
+
+  beforeEach(() => {
+    titleCandidates = new bookFinder.constructor.TitleCandidates('leo tolstoy')
+  })
+
+  describe('single add', () => {
+    it.each([
+      ['adds a clean title to candidates', 'anna karenina', ['anna karenina']],
+      ['lowercases candidate title', 'ANNA KARENINA', ['anna karenina']],
+      ['removes author name from title', 'anna karenina by leo tolstoy', ['anna karenina']],
+      ['removes author name title', 'leo tolstoy', []],
+      ['cleans subtitle from title', 'anna karenina: subtitle', ['anna karenina']],
+      ['removes "by ..." from title', 'anna karenina by arnold schwarzenegger', ['anna karenina', 'anna karenina by arnold schwarzenegger']],
+      ['removes bitrate from title', 'anna karenina 64kbps', ['anna karenina', 'anna karenina 64kbps']],
+      ['removes edition from title 1', 'anna karenina 2nd edition', ['anna karenina', 'anna karenina 2nd edition']],
+      ['removes edition from title 2', 'anna karenina 4th ed.', ['anna karenina', 'anna karenina 4th ed.']],
+      ['removes file-type from title', 'anna karenina.mp3', ['anna karenina', 'anna karenina.mp3']],
+      ['removes "a novel" from title', 'anna karenina a novel', ['anna karenina', 'anna karenina a novel']],
+      ['removes preceding/trailing numbers from title', '1 anna karenina 2', ['anna karenina', '1 anna karenina 2']],
+      ['does not add empty title', '', []],
+      ['does not add title with only spaces', '   ', []],
+      ['adds digit-only title, but not its empty string transformation', '1984', ['1984']],
+    ])('%s', (_, title, expected) => {
+      titleCandidates.add(title)
+      expect(titleCandidates.getCandidates()).toEqual(expected)
+    })
+  })
+
+  describe('multi add', () => {
+    it.each([
+      ['digits-only candidates get lower priority', ['01', 'anna karenina'], ['anna karenina', '01']],
+      ['transformed candidates get higher priority', ['title1 1', 'title2 1'], ['title1', 'title2', 'title1 1', 'title2 1']],
+      ['other candidates are ordered by position', ['title1', 'title2'], ['title1', 'title2']],
+      ['author candidate is removed', ['title1', 'leo tolstoy'], ['title1']],
+    ])('%s', (_, titles, expected) => {
+      for (const title of titles) titleCandidates.add(title)
+      expect(titleCandidates.getCandidates()).toEqual(expected)
+    })
+  })
+})
+
+describe('TitleCandidates with no author', () => {
+  let titleCandidates
+
+  beforeEach(() => {
+    titleCandidates = new bookFinder.constructor.TitleCandidates('')
+  })
+
+  describe('single add', () => {
+    it.each([
+      ['does not removes author name', 'leo tolstoy', ['leo tolstoy']],
+    ])('%s', (_, title, expected) => {
+      titleCandidates.add(title)
+      expect(titleCandidates.getCandidates()).toEqual(expected)
+    })
+  })
+})
+