more test coverage (#18)

Signed-off-by: Brian DeHamer <[email protected]>

__tests__/predicate.test.ts

@@ -0,0 +1,92 @@
+import fs from 'fs/promises'
+import os from 'os'
+import path from 'path'
+import { predicateFromInputs } from '../src/predicate'
+
+describe('subjectFromInputs', () => {
+  afterEach(() => {
+    process.env['INPUT_PREDICATE'] = ''
+    process.env['INPUT_PREDICATE-PATH'] = ''
+    process.env['INPUT_PREDICATE-TYPE'] = ''
+  })
+
+  describe('when no inputs are provided', () => {
+    it('throws an error', () => {
+      expect(() => predicateFromInputs()).toThrow(/predicate-type/i)
+    })
+  })
+
+  describe('when neither predicate path nor predicate are provided', () => {
+    beforeEach(() => {
+      process.env['INPUT_PREDICATE-TYPE'] = 'https://example.com/predicate'
+    })
+
+    it('throws an error', () => {
+      expect(() => predicateFromInputs()).toThrow(
+        /one of predicate-path or predicate must be provided/i
+      )
+    })
+  })
+
+  describe('when both predicate path and predicate are provided', () => {
+    beforeEach(() => {
+      process.env['INPUT_PREDICATE-PATH'] = 'path/to/predicate'
+      process.env['INPUT_PREDICATE'] = '{}'
+      process.env['INPUT_PREDICATE-TYPE'] = 'https://example.com/predicate'
+    })
+
+    it('throws an error', () => {
+      expect(() => predicateFromInputs()).toThrow(
+        /only one of predicate-path or predicate may be provided/i
+      )
+    })
+  })
+
+  describe('when specifying a predicate path', () => {
+    let dir = ''
+    const filename = 'subject'
+    const content = '{}'
+
+    beforeEach(async () => {
+      // Set-up temp directory
+      const tmpDir = await fs.realpath(os.tmpdir())
+      dir = await fs.mkdtemp(tmpDir + path.sep)
+
+      // Write file to temp directory
+      await fs.writeFile(path.join(dir, filename), content)
+    })
+
+    afterEach(async () => {
+      // Clean-up temp directory
+      await fs.rm(dir, { recursive: true })
+    })
+
+    beforeEach(() => {
+      process.env['INPUT_PREDICATE-PATH'] = path.join(dir, filename)
+      process.env['INPUT_PREDICATE-TYPE'] = 'https://example.com/predicate'
+    })
+
+    it('returns the predicate', () => {
+      expect(predicateFromInputs()).toEqual({
+        type: 'https://example.com/predicate',
+        params: {}
+      })
+    })
+  })
+
+  describe('when specifying a predicate value', () => {
+    const content = '{}'
+
+    beforeEach(() => {
+      process.env['INPUT_PREDICATE'] = content
+      process.env['INPUT_PREDICATE-TYPE'] = 'https://example.com/predicate'
+    })
+
+    it('returns the predicate', () => {
+      expect(predicateFromInputs()).toEqual({
+        type: 'https://example.com/predicate',
+        params: {}
+      })
+    })
+  })
+})