Cache identicons

Fixes #197

Also as a side effect, by creating this `iconFactory.cache` object, we have a convenient place for specifying stock icons for known contracts!

We can just hard-code image addresses in the `ui/lib/icon-factory.js` cache instantiation, and those values will be injected into the identicon image tag `src` attributes.

1 files changed, 31 insertions, 0 deletions

diff --git a/test/unit/lib/icon-factory-test.js b/test/unit/lib/icon-factory-test.js
new file mode 100644
index 000000000..2f24d408c
--- /dev/null
+++ b/test/unit/lib/icon-factory-test.js
@@ -0,0 +1,31 @@
+const assert = require('assert')
+const sinon = require('sinon')
+
+const path = require('path')
+const IconFactoryGen = require(path.join(__dirname, '..', '..', '..', 'ui', 'lib', 'icon-factory.js'))
+
+describe('icon-factory', function() {
+  let iconFactory, address, diameter
+
+  beforeEach(function() {
+    iconFactory = IconFactoryGen((d,n) => 'stubicon')
+    address = '0x012345671234567890'
+    diameter = 50
+  })
+
+  it('should return a data-uri string for any address and diameter', function() {
+    const output = iconFactory.iconForAddress(address, diameter)
+    assert.ok(output.indexOf('data:image/svg') === 0)
+    assert.equal(output, iconFactory.cache[address][diameter])
+  })
+
+  it('should default to cache first', function() {
+    const testOutput = 'foo'
+    const mockSizeCache = {}
+    mockSizeCache[diameter] = testOutput
+    iconFactory.cache[address] = mockSizeCache
+
+    const output = iconFactory.iconForAddress(address, diameter)
+    assert.equal(output, testOutput)
+  })
+})