CSV import as a table and db connection rework

- Add csv to existing db #32
- [RFE] Simplify working with temporary tables #53

tests/components/CsvImport/csv.spec.js

@@ -0,0 +1,115 @@
+import { expect } from 'chai'
+import sinon from 'sinon'
+import csv from '@/components/CsvImport/csv'
+import Papa from 'papaparse'
+
+describe('csv.js', () => {
+  afterEach(() => {
+    sinon.restore()
+  })
+
+  it('getResult with fields', () => {
+    const source = {
+      data: [
+        { id: 1, name: 'foo' },
+        { id: 2, name: 'bar' }
+      ],
+      meta: {
+        fields: ['id', 'name ']
+      }
+    }
+    expect(csv.getResult(source)).to.eql({
+      columns: ['id', 'name'],
+      values: [
+        [1, 'foo'],
+        [2, 'bar']
+      ]
+    })
+  })
+
+  it('getResult without fields', () => {
+    const source = {
+      data: [
+        [1, 'foo'],
+        [2, 'bar']
+      ],
+      meta: {}
+    }
+    expect(csv.getResult(source)).to.eql({
+      columns: ['col1', 'col2'],
+      values: [
+        [1, 'foo'],
+        [2, 'bar']
+      ]
+    })
+  })
+
+  it('parse resolves', async () => {
+    sinon.stub(Papa, 'parse').callsFake((file, config) => {
+      config.complete({
+        data: [
+          [1, 'foo'],
+          [2, 'bar']
+        ],
+        errors: [
+          {
+            type: 'Quotes',
+            code: 'MissingQuotes',
+            message: 'Quote is missed',
+            row: 0
+          },
+          {
+            type: 'Delimiter',
+            code: 'UndetectableDelimiter',
+            message: 'Comma was used as a standart delimiter',
+            row: 0
+          }
+        ],
+        meta: {
+          delimiter: ',',
+          linebreak: '\n',
+          aborted: false,
+          truncated: true
+        }
+      })
+    })
+    const file = {}
+    const result = await csv.parse(file)
+    expect(result).to.eql({
+      data: {
+        columns: ['col1', 'col2'],
+        values: [
+          [1, 'foo'],
+          [2, 'bar']
+        ]
+      },
+      delimiter: ',',
+      hasErrors: true,
+      messages: [
+        {
+          code: 'MissingQuotes',
+          message: 'Quote is missed',
+          row: 0,
+          type: 'error',
+          hint: 'Edit your CSV so that the field has a closing quote char.'
+        },
+        {
+          code: 'UndetectableDelimiter',
+          message: 'Comma was used as a standart delimiter',
+          row: 0,
+          type: 'info',
+          hint: undefined
+        }
+      ]
+    })
+  })
+
+  it('parse rejects', async () => {
+    const err = new Error('something went wrong')
+    sinon.stub(Papa, 'parse').callsFake((file, config) => {
+      config.error(err)
+    })
+    const file = {}
+    await expect(csv.parse(file)).to.be.rejectedWith(err)
+  })
+})