Test Observable.find;

tests/find.lua

@@ -0,0 +1,36 @@
+describe('find', function()
+  it('produces an error if its parent errors', function()
+    local observable = Rx.Observable.fromValue(''):map(function(x) return x() end)
+    expect(observable.subscribe).to.fail()
+    expect(observable:find().subscribe).to.fail()
+  end)
+
+  it('uses the identity function as a predicate if none is specified', function()
+    local observable = Rx.Observable.fromTable({false, false, true, true, false}):find()
+    expect(observable).to.produce(true)
+  end)
+
+  it('passes all arguments to the predicate', function()
+    local predicate = spy()
+
+    local observable = Rx.Observable.create(function(observer)
+      observer:onNext(1, 2, 3)
+      observer:onNext(4, 5, 6)
+      observer:onComplete()
+    end)
+
+    observable:find(predicate):subscribe()
+
+    expect(predicate).to.equal({{1, 2, 3}, {4, 5, 6}})
+  end)
+
+  it('produces the first element for which the predicate returns true and completes', function()
+    local observable = Rx.Observable.fromRange(5):find(function(x) return x > 3 end)
+    expect(observable).to.produce(4)
+  end)
+
+  it('completes after its parent completes if no value satisfied the predicate', function()
+    local observable = Rx.Observable.fromRange(5):find(function() return false end)
+    expect(observable).to.produce({})
+  end)
+end)

tests/observable.lua

@@ -156,4 +156,5 @@ describe('Observable', function()
   dofile('tests/concat.lua')
   dofile('tests/distinct.lua')
   dofile('tests/filter.lua')
+  dofile('tests/find.lua')
 end)