Add tests for pyproject.toml-style projects using poetry

Add two test cases for projects using poetry as the build backend:

- testPoetry: project without dependencies

- testPoetryLock: project with dependencies, using a poetry.lock file

Author: cjolowicz

test/fixtures/poetry-lock/foobar.py

@@ -0,0 +1,15 @@
+[tool.poetry]
+name = "foobar"
+version = "0.1.0"
+description = ""
+authors = ["Your Name <[email protected]>"]
+
+[tool.poetry.dependencies]
+python = "^3.6"
+attrs = "^19.1.0"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"

test/fixtures/poetry-lock/poetry.lock

@@ -0,0 +1,14 @@
+[tool.poetry]
+name = "foobar"
+version = "0.1.0"
+description = ""
+authors = ["Your Name <[email protected]>"]
+
+[tool.poetry.dependencies]
+python = "^3.6"
+
+[tool.poetry.dev-dependencies]
+
+[build-system]
+requires = ["poetry>=0.12"]
+build-backend = "poetry.masonry.api"

test/fixtures/poetry-lock/pyproject.toml

@@ -70,6 +70,16 @@ testPipenvFullVersion() {
   assertCapturedSuccess
 }
 
+testPoetry() {
+    compile "poetry"
+    assertCapturedSuccess
+}
+
+testPoetryLock() {
+    compile "poetry-lock"
+    assertCapturedSuccess
+}
+
 testNoRequirements() {
   compile "no-requirements"
   assertCapturedError