Use table driven test
This simplifies reasoning about the tests by not hiding logic behind a DSL.
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kortschak
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2 changed files with 279 additions and 230 deletions
279
query/gremlin/gremlin_test.go
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279
query/gremlin/gremlin_test.go
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// Copyright 2014 The Cayley Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package gremlin
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import (
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"reflect"
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"sort"
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"testing"
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"github.com/google/cayley/graph"
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"github.com/google/cayley/graph/memstore"
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)
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// This is a simple test graph.
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//
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// +---+ +---+
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// | A |------- ->| F |<--
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// +---+ \------>+---+-/ +---+ \--+---+
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// ------>|#B#| | | E |
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// +---+-------/ >+---+ | +---+
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// | C | / v
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// +---+ -/ +---+
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// ---- +---+/ |#G#|
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// \-->|#D#|------------->+---+
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// +---+
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//
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var simpleGraph = []*graph.Triple{
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{"A", "follows", "B", ""},
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{"C", "follows", "B", ""},
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{"C", "follows", "D", ""},
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{"D", "follows", "B", ""},
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{"B", "follows", "F", ""},
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{"F", "follows", "G", ""},
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{"D", "follows", "G", ""},
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{"E", "follows", "F", ""},
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{"B", "status", "cool", "status_graph"},
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{"D", "status", "cool", "status_graph"},
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{"G", "status", "cool", "status_graph"},
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}
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func makeTestSession(data []*graph.Triple) *Session {
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ts := memstore.NewTripleStore()
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for _, t := range data {
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ts.AddTriple(t)
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}
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return NewSession(ts, -1, false)
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}
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var testQueries = []struct {
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message string
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query string
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tag string
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expect []string
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}{
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// Simple query tests.
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{
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message: "get a single vertex",
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query: `
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g.V("A").All()
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`,
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expect: []string{"A"},
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},
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{
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message: "use .Out()",
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query: `
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g.V("A").Out("follows").All()
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`,
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expect: []string{"B"},
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},
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{
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message: "use .In()",
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query: `
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g.V("B").In("follows").All()
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`,
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expect: []string{"A", "C", "D"},
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},
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{
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message: "use .Both()",
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query: `
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g.V("F").Both("follows").All()
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`,
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expect: []string{"B", "G", "E"},
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},
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{
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message: "use .Tag()-.Is()-.Back()",
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query: `
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g.V("B").In("follows").Tag("foo").Out("status").Is("cool").Back("foo").All()
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`,
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expect: []string{"D"},
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},
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{
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message: "separate .Tag()-.Is()-.Back()",
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query: `
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x = g.V("C").Out("follows").Tag("foo").Out("status").Is("cool").Back("foo")
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x.In("follows").Is("D").Back("foo").All()
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`,
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expect: []string{"B"},
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},
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{
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message: "do multiple .Back()s",
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query: `
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g.V("E").Out("follows").As("f").Out("follows").Out("status").Is("cool").Back("f").In("follows").In("follows").As("acd").Out("status").Is("cool").Back("f").All()
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`,
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tag: "acd",
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expect: []string{"D"},
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},
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// Morphism tests.
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{
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message: "show simple morphism works",
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query: `
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grandfollows = g.M().Out("follows").Out("follows")
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g.V("C").Follow(grandfollows).All()
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`,
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expect: []string{"G", "F", "B"},
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},
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{
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message: "show reverse morphism works",
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query: `
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grandfollows = g.M().Out("follows").Out("follows")
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g.V("F").FollowR(grandfollows).All()
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`,
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expect: []string{"A", "C", "D"},
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},
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// Intersection tests.
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{
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message: "Simple intersection",
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query: `
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function follows(x) { return g.V(x).Out("follows") }
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follows("D").And(follows("C")).All()
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`,
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expect: []string{"B"},
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},
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{
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message: "Simple Morphism Intersection",
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query: `
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grandfollows = g.M().Out("follows").Out("follows")
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function gfollows(x) { return g.V(x).Follow(grandfollows) }
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gfollows("A").And(gfollows("C")).All()
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`,
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expect: []string{"F"},
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},
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{
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message: "Double Morphism Intersection",
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query: `
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grandfollows = g.M().Out("follows").Out("follows")
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function gfollows(x) { return g.V(x).Follow(grandfollows) }
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gfollows("E").And(gfollows("C")).And(gfollows("B")).All()
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`,
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expect: []string{"G"},
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},
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{
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message: "Reverse Intersection",
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query: `
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grandfollows = g.M().Out("follows").Out("follows")
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g.V("G").FollowR(grandfollows).Intersect(g.V("F").FollowR(grandfollows)).All()
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`,
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expect: []string{"C"},
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},
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{
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message: "Standard sort of morphism intersection, continue follow",
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query: `gfollowers = g.M().In("follows").In("follows")
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function cool(x) { return g.V(x).As("a").Out("status").Is("cool").Back("a") }
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cool("G").Follow(gfollowers).Intersect(cool("B").Follow(gfollowers)).All()
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`,
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expect: []string{"C"},
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},
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// Gremlin Has tests.
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{
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message: "show a simple Has",
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query: `
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g.V().Has("status", "cool").All()
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`,
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expect: []string{"G", "D", "B"},
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},
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{
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message: "show a double Has",
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query: `
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g.V().Has("status", "cool").Has("follows", "F").All()
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`,
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expect: []string{"B"},
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},
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// Tag tests.
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{
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message: "show a simple save",
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query: `
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g.V().Save("status", "somecool").All()
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`,
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tag: "somecool",
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expect: []string{"cool", "cool", "cool"},
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},
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{
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message: "show a simple saveR",
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query: `
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g.V("cool").SaveR("status", "who").All()
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`,
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tag: "who",
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expect: []string{"G", "D", "B"},
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},
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{
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message: "show an out save",
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query: `
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g.V("D").Out(null, "pred").All()
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`,
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tag: "pred",
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expect: []string{"follows", "follows", "status"},
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},
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{
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message: "show a tag list",
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query: `
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g.V("D").Out(null, ["pred", "foo", "bar"]).All()
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`,
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tag: "foo",
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expect: []string{"follows", "follows", "status"},
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},
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{
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message: "show a pred list",
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query: `
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g.V("D").Out(["follows", "status"]).All()
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`,
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expect: []string{"B", "G", "cool"},
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},
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{
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message: "show a predicate path",
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query: `
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g.V("D").Out(g.V("follows"), "pred").All()
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`,
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expect: []string{"B", "G"},
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},
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}
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func runQueryGetTag(g []*graph.Triple, query string, tag string) []string {
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js := makeTestSession(g)
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c := make(chan interface{}, 5)
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js.ExecInput(query, c, -1)
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var results []string
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for res := range c {
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data := res.(*GremlinResult)
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if data.val == nil {
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val := (*data.actualResults)[tag]
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if val != nil {
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results = append(results, js.ts.GetNameFor(val))
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}
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}
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}
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return results
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}
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func TestGremlin(t *testing.T) {
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for _, test := range testQueries {
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if test.tag == "" {
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test.tag = TopResultTag
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}
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got := runQueryGetTag(simpleGraph, test.query, test.tag)
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sort.Strings(got)
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sort.Strings(test.expect)
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if !reflect.DeepEqual(got, test.expect) {
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t.Errorf("Failed to %s, got: %v expected: %v", test.message, got, test.expect)
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}
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}
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}
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