1 files changed, 79 insertions, 0 deletions
diff --git a/test/unit/specs/services/style_setter/style_setter.spec.js b/test/unit/specs/services/style_setter/style_setter.spec.js
new file mode 100644
index 00000000..7f789124
--- /dev/null
+++ b/test/unit/specs/services/style_setter/style_setter.spec.js
@@ -0,0 +1,79 @@
+import { getLayersArray, topoSort } from 'src/services/style_setter/style_setter'
+
+describe('getLayersArray', () => {
+  const fixture = {
+    layer1: null,
+    layer2: 'layer1',
+    layer3a: 'layer2',
+    layer3b: 'layer2'
+  }
+
+  it('should expand layers properly (3b)', () => {
+    const out = getLayersArray('layer3b', fixture)
+    expect(out).to.eql(['layer1', 'layer2', 'layer3b'])
+  })
+
+  it('should expand layers properly (3a)', () => {
+    const out = getLayersArray('layer3a', fixture)
+    expect(out).to.eql(['layer1', 'layer2', 'layer3a'])
+  })
+
+  it('should expand layers properly (2)', () => {
+    const out = getLayersArray('layer2', fixture)
+    expect(out).to.eql(['layer1', 'layer2'])
+  })
+
+  it('should expand layers properly (1)', () => {
+    const out = getLayersArray('layer1', fixture)
+    expect(out).to.eql(['layer1'])
+  })
+})
+
+describe('topoSort', () => {
+  const fixture1 = {
+    layerA: [],
+    layer1A: ['layerA'],
+    layer2A: ['layer1A'],
+    layerB: [],
+    layer1B: ['layerB'],
+    layer2B: ['layer1B'],
+    layer3AB: ['layer2B', 'layer2A']
+  }
+
+  // Same thing but messed up order
+  const fixture2 = {
+    layer1A: ['layerA'],
+    layer1B: ['layerB'],
+    layer2A: ['layer1A'],
+    layerB: [],
+    layer3AB: ['layer2B', 'layer2A'],
+    layer2B: ['layer1B'],
+    layerA: []
+  }
+
+  it('should make a topologically sorted array', () => {
+    const out = topoSort(fixture1, (node, inheritance) => inheritance[node])
+    // This basically checks all ordering that matters
+    expect(out.indexOf('layerA')).to.be.below(out.indexOf('layer1A'))
+    expect(out.indexOf('layer1A')).to.be.below(out.indexOf('layer2A'))
+    expect(out.indexOf('layerB')).to.be.below(out.indexOf('layer1B'))
+    expect(out.indexOf('layer1B')).to.be.below(out.indexOf('layer2B'))
+    expect(out.indexOf('layer2A')).to.be.below(out.indexOf('layer3AB'))
+    expect(out.indexOf('layer2B')).to.be.below(out.indexOf('layer3AB'))
+  })
+
+  it('order in object shouldn\'t matter', () => {
+    const out = topoSort(fixture2, (node, inheritance) => inheritance[node])
+    // This basically checks all ordering that matters
+    expect(out.indexOf('layerA')).to.be.below(out.indexOf('layer1A'))
+    expect(out.indexOf('layer1A')).to.be.below(out.indexOf('layer2A'))
+    expect(out.indexOf('layerB')).to.be.below(out.indexOf('layer1B'))
+    expect(out.indexOf('layer1B')).to.be.below(out.indexOf('layer2B'))
+    expect(out.indexOf('layer2A')).to.be.below(out.indexOf('layer3AB'))
+    expect(out.indexOf('layer2B')).to.be.below(out.indexOf('layer3AB'))
+  })
+  it('ignores cyclic dependencies', () => {
+    const out = topoSort({ a: 'b', b: 'a', c: 'a' }, (node, inheritance) => inheritance[node])
+    expect(out.indexOf('a')).to.be.below(out.indexOf('c'))
+  })
+})