Test transformExample directly (#3041)

These tests in `base.spec.js` are difficult to maintain.

core/base-service/base.spec.js

@@ -43,18 +43,6 @@ class DummyService extends BaseService {
         staticPreview: this.render({ namedParamA: 'foo', queryParamA: 'bar' }),
         keywords: ['hello'],
       },
-      {
-        namedParams: { namedParamA: 'World' },
-        staticPreview: this.render({ namedParamA: 'foo', queryParamA: 'bar' }),
-        keywords: ['hello'],
-      },
-      {
-        pattern: ':world',
-        namedParams: { world: 'World' },
-        queryParams: { queryParamA: '!!!' },
-        staticPreview: this.render({ namedParamA: 'foo', queryParamA: 'bar' }),
-        keywords: ['hello'],
-      },
     ]
   }
 
@@ -343,59 +331,8 @@ describe('BaseService', function() {
           queryParams: [],
         },
       })
-
-      const [first, second, third] = examples
-      expect(first).to.deep.equal({
-        title: 'DummyService',
-        example: {
-          pattern: '/foo/:world',
-          namedParams: { world: 'World' },
-          queryParams: {},
-        },
-        preview: {
-          label: 'cat',
-          message: 'Hello namedParamA: foo with queryParamA: bar',
-          color: 'lightgrey',
-          namedLogo: undefined,
-          style: undefined,
-        },
-        keywords: ['hello'],
-        documentation: undefined,
-      })
-      expect(second).to.deep.equal({
-        title: 'DummyService',
-        example: {
-          pattern: '/foo/:namedParamA',
-          namedParams: { namedParamA: 'World' },
-          queryParams: {},
-        },
-        preview: {
-          label: 'cat',
-          message: 'Hello namedParamA: foo with queryParamA: bar',
-          color: 'lightgrey',
-          namedLogo: undefined,
-          style: undefined,
-        },
-        keywords: ['hello'],
-        documentation: undefined,
-      })
-      expect(third).to.deep.equal({
-        title: 'DummyService',
-        example: {
-          pattern: '/foo/:world',
-          namedParams: { world: 'World' },
-          queryParams: { queryParamA: '!!!' },
-        },
-        preview: {
-          color: 'lightgrey',
-          label: 'cat',
-          message: 'Hello namedParamA: foo with queryParamA: bar',
-          namedLogo: undefined,
-          style: undefined,
-        },
-        keywords: ['hello'],
-        documentation: undefined,
-      })
+      // The in-depth tests for examples reside in transform-example.spec.js
+      expect(examples).to.have.lengthOf(1)
     })
   })
 

core/base-service/transform-example.spec.js

@@ -1,7 +1,8 @@
 'use strict'
 
 const { expect } = require('chai')
-const { validateExample } = require('./transform-example')
+const { test, given } = require('sazerac')
+const { validateExample, transformExample } = require('./transform-example')
 
 describe('validateExample function', function() {
   it('passes valid examples', function() {
@@ -72,3 +73,96 @@ describe('validateExample function', function() {
     })
   })
 })
+
+test(transformExample, function() {
+  const ExampleService = {
+    name: 'ExampleService',
+    route: {
+      base: 'some-service',
+      pattern: ':interval/:packageName',
+    },
+    defaultBadgeData: {
+      label: 'downloads',
+    },
+  }
+
+  given(
+    {
+      pattern: 'dt/:packageName',
+      namedParams: { packageName: 'express' },
+      staticPreview: { message: '50k' },
+      keywords: ['hello'],
+    },
+    0,
+    ExampleService
+  ).expect({
+    title: 'ExampleService',
+    example: {
+      pattern: '/some-service/dt/:packageName',
+      namedParams: { packageName: 'express' },
+      queryParams: {},
+    },
+    preview: {
+      label: 'downloads',
+      message: '50k',
+      color: 'lightgrey',
+      namedLogo: undefined,
+      style: undefined,
+    },
+    keywords: ['hello'],
+    documentation: undefined,
+  })
+
+  given(
+    {
+      namedParams: { interval: 'dt', packageName: 'express' },
+      staticPreview: { message: '50k' },
+      keywords: ['hello'],
+    },
+    0,
+    ExampleService
+  ).expect({
+    title: 'ExampleService',
+    example: {
+      pattern: '/some-service/:interval/:packageName',
+      namedParams: { interval: 'dt', packageName: 'express' },
+      queryParams: {},
+    },
+    preview: {
+      label: 'downloads',
+      message: '50k',
+      color: 'lightgrey',
+      namedLogo: undefined,
+      style: undefined,
+    },
+    keywords: ['hello'],
+    documentation: undefined,
+  })
+
+  given(
+    {
+      namedParams: { interval: 'dt', packageName: 'express' },
+      queryParams: { registry_url: 'http://example.com/' },
+      staticPreview: { message: '50k' },
+      keywords: ['hello'],
+    },
+    0,
+    ExampleService
+  ).expect({
+    title: 'ExampleService',
+    example: {
+      pattern: '/some-service/:interval/:packageName',
+      namedParams: { interval: 'dt', packageName: 'express' },
+      queryParams: { registry_url: 'http://example.com/' },
+    },
+    preview: {
+      label: 'downloads',
+      message: '50k',
+      color: 'lightgrey',
+      namedLogo: undefined,
+      style: undefined,
+    },
+    keywords: ['hello'],
+    documentation: undefined,
+  })
+})