diff --git a/README.md b/README.md
index 75f32df..4acef3a 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,8 @@ don't allow this because they don't work on a level of individual jobs or steps.
   run: ...
 ```
 
+For a more complete example, see [sample-filters.yml](./sample-filters.yml).
+
 For more scenarios see [examples](#examples) section.
 
 ## Notes
diff --git a/__tests__/csv-escape.test.ts b/__tests__/csv-escape.test.ts
index f6dc6df..21a7c3a 100644
--- a/__tests__/csv-escape.test.ts
+++ b/__tests__/csv-escape.test.ts
@@ -1,6 +1,9 @@
 import {csvEscape} from '../src/list-format/csv-escape'
 
 describe('csvEscape() backslash escapes every character except subset of definitely safe characters', () => {
+  test('empty string is returned unchanged', () => {
+    expect(csvEscape('')).toBe('')
+  })
   test('simple filename should not be modified', () => {
     expect(csvEscape('file.txt')).toBe('file.txt')
   })
diff --git a/__tests__/export-format.test.ts b/__tests__/export-format.test.ts
new file mode 100644
index 0000000..acc8084
--- /dev/null
+++ b/__tests__/export-format.test.ts
@@ -0,0 +1,42 @@
+import {ChangeStatus} from '../src/file'
+import {exportResults} from '../src/main'
+import * as core from '@actions/core'
+
+jest.mock('@actions/core', () => ({
+  info: jest.fn(),
+  startGroup: jest.fn(),
+  endGroup: jest.fn(),
+  setOutput: jest.fn()
+}))
+
+describe('exportResults file listing formats', () => {
+  const files = [
+    {filename: 'simple.txt', status: ChangeStatus.Modified},
+    {filename: 'file with space.txt', status: ChangeStatus.Added}
+  ]
+  const results = {sample: files}
+
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  test('exports csv formatted list', () => {
+    exportResults(results, 'csv')
+    expect(core.setOutput).toHaveBeenCalledWith('sample_files', 'simple.txt,"file with space.txt"')
+  })
+
+  test('exports json formatted list', () => {
+    exportResults(results, 'json')
+    expect(core.setOutput).toHaveBeenCalledWith('sample_files', JSON.stringify(['simple.txt', 'file with space.txt']))
+  })
+
+  test('exports shell escaped list', () => {
+    exportResults(results, 'shell')
+    expect(core.setOutput).toHaveBeenCalledWith('sample_files', "simple.txt 'file with space.txt'")
+  })
+
+  test('exports escape formatted list', () => {
+    exportResults(results, 'escape')
+    expect(core.setOutput).toHaveBeenCalledWith('sample_files', 'simple.txt file\\ with\\ space.txt')
+  })
+})
diff --git a/__tests__/fixtures/sample-filter.yml b/__tests__/fixtures/sample-filter.yml
new file mode 100644
index 0000000..bc602ea
--- /dev/null
+++ b/__tests__/fixtures/sample-filter.yml
@@ -0,0 +1,2 @@
+sample:
+  - 'src/**/*.ts'
diff --git a/__tests__/git.test.ts b/__tests__/git.test.ts
index 9645221..c88a5a9 100644
--- a/__tests__/git.test.ts
+++ b/__tests__/git.test.ts
@@ -14,6 +14,17 @@ describe('parsing output of the git diff command', () => {
     expect(files[2].filename).toBe('src/main.ts')
     expect(files[2].status).toBe(ChangeStatus.Deleted)
   })
+
+  test('parseGitDiffOutput handles copied, renamed and unmerged statuses', async () => {
+    const files = git.parseGitDiffOutput(
+      'C\u0000src/copied.ts\u0000' + 'R\u0000src/renamed.ts\u0000' + 'U\u0000src/conflict.ts\u0000'
+    )
+    expect(files).toEqual([
+      {filename: 'src/copied.ts', status: ChangeStatus.Copied},
+      {filename: 'src/renamed.ts', status: ChangeStatus.Renamed},
+      {filename: 'src/conflict.ts', status: ChangeStatus.Unmerged}
+    ])
+  })
 })
 
 describe('git utility function tests (those not invoking git)', () => {
diff --git a/__tests__/predicate-quantifier.test.ts b/__tests__/predicate-quantifier.test.ts
new file mode 100644
index 0000000..be3b66e
--- /dev/null
+++ b/__tests__/predicate-quantifier.test.ts
@@ -0,0 +1,15 @@
+import {isPredicateQuantifier, SUPPORTED_PREDICATE_QUANTIFIERS} from '../src/filter'
+
+describe('isPredicateQuantifier', () => {
+  test('returns true for supported values', () => {
+    for (const value of SUPPORTED_PREDICATE_QUANTIFIERS) {
+      expect(isPredicateQuantifier(value)).toBe(true)
+    }
+  })
+
+  test('returns false for unsupported values including sample', () => {
+    expect(isPredicateQuantifier('sample')).toBe(false)
+    expect(isPredicateQuantifier('')).toBe(false)
+    expect(isPredicateQuantifier(undefined)).toBe(false)
+  })
+})
diff --git a/__tests__/sample-config.test.ts b/__tests__/sample-config.test.ts
new file mode 100644
index 0000000..8a2a90a
--- /dev/null
+++ b/__tests__/sample-config.test.ts
@@ -0,0 +1,15 @@
+import * as fs from 'fs'
+import * as path from 'path'
+import {Filter} from '../src/filter'
+import {ChangeStatus} from '../src/file'
+
+describe('sample configuration file', () => {
+  test('parses filter rules from sample file', () => {
+    const yamlPath = path.join(__dirname, 'fixtures', 'sample-filter.yml')
+    const yaml = fs.readFileSync(yamlPath, 'utf8')
+    const filter = new Filter(yaml)
+    const files = [{filename: 'src/index.ts', status: ChangeStatus.Modified}]
+    const match = filter.match(files)
+    expect(match.sample).toEqual(files)
+  })
+})
diff --git a/__tests__/sample.test.ts b/__tests__/sample.test.ts
new file mode 100644
index 0000000..85e4a43
--- /dev/null
+++ b/__tests__/sample.test.ts
@@ -0,0 +1,26 @@
+import {Filter} from '../src/filter'
+import {ChangeStatus} from '../src/file'
+
+describe('sample filter usage', () => {
+  test('matches files in sample folder', () => {
+    const yaml = `
+    sample:
+      - sample/**
+    `
+    const filter = new Filter(yaml)
+    const files = [{filename: 'sample/example.ts', status: ChangeStatus.Modified}]
+    const match = filter.match(files)
+    expect(match.sample).toEqual(files)
+  })
+
+  test('does not match files outside sample folder', () => {
+    const yaml = `
+    sample:
+      - sample/**
+    `
+    const filter = new Filter(yaml)
+    const files = [{filename: 'other/example.ts', status: ChangeStatus.Modified}]
+    const match = filter.match(files)
+    expect(match.sample).toEqual([])
+  })
+})
diff --git a/__tests__/shell-escape.test.ts b/__tests__/shell-escape.test.ts
index ece4c37..b0c230d 100644
--- a/__tests__/shell-escape.test.ts
+++ b/__tests__/shell-escape.test.ts
@@ -1,6 +1,9 @@
 import {backslashEscape, shellEscape} from '../src/list-format/shell-escape'
 
 describe('escape() backslash escapes every character except subset of definitely safe characters', () => {
+  test('empty string is returned unchanged', () => {
+    expect(backslashEscape('')).toBe('')
+  })
   test('simple filename should not be modified', () => {
     expect(backslashEscape('file.txt')).toBe('file.txt')
   })
diff --git a/sample-filters.yml b/sample-filters.yml
new file mode 100644
index 0000000..cf5a3a3
--- /dev/null
+++ b/sample-filters.yml
@@ -0,0 +1,11 @@
+# Sample filters configuration for paths-filter action
+# Demonstrates basic usage of filters and change status qualifiers
+shared: &shared
+  - common/**
+  - config/**
+backend:
+  - *shared
+  - src/backend/**
+docs:
+  - added: docs/**
+  - modified: README.md