handle .exactly(0) (#152)

enzymejs · Feb 20, 2017 · b0d35c7 · b0d35c7
1 parent 74e4b16
commit b0d35c7
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Showing 2 changed files with 11 additions and 1 deletion.
diff --git a/src/assertions/descendants.js b/src/assertions/descendants.js
@@ -1,7 +1,7 @@
 export default function descendants ({ wrapper, markup, arg1, sig, flag }) {
   const exactlyCount = flag(this, 'exactlyCount')
 
-  if (exactlyCount) {
+  if (exactlyCount || exactlyCount === 0) {
     const descendantCount = wrapper.getDescendantsCount(arg1)
 
     this.assert(

diff --git a/test/exactly.test.js b/test/exactly.test.js
@@ -29,6 +29,10 @@ describe('#exactly', () => {
       expect(wrapper).to.have.exactly(8).descendants('.multiple')
     })
 
+    it('passes when the the expected is 0 and there are none', (wrapper) => {
+      expect(wrapper).to.have.exactly(0).descendants('#root1')
+    })
+
     it('passes negated when the actual does not match the expected', (wrapper) => {
       expect(wrapper).to.not.have.exactly(3).descendants('#root1')
       expect(wrapper.find('#child')).to.not.have.exactly(5).descendants('#last1')
@@ -47,5 +51,11 @@ describe('#exactly', () => {
         expect(wrapper).to.not.have.exactly(8).descendants('.multiple')
       }).to.throw("not to have 8 descendants '.multiple'")
     })
+
+    it('fails when the the expected is 0 and there are some', (wrapper) => {
+      expect(() => {
+        expect(wrapper).to.have.exactly(0).descendants('#root')
+      }).to.throw("to have 0 descendants '#root'")
+    })
   })
 })