diff --git a/.travis.yml b/.travis.yml
index 8f88823..a3142da 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,48 +1,72 @@
+# Generated by scripts/make_travisconf.py
+
 sudo: true
 language: python
-python:
-    - "2.7"
-    - "pypy"
-    - "3.3"
-    - "3.4"
-    - "3.5"
-env:
-    - BUILD=test
-      # Default build, see Makefile
-
-    - BUILD=style
-      # flake8 with plugins
-
-    # REMOTESTORAGE TESTS
-
-  #  - BUILD=test REMOTESTORAGE_SERVER=restore
-      # Testing against reStore
-      # https://github.com/jcoglan/restore/issues/38
-      # https://github.com/jcoglan/restore/issues/37
-
-    # DAV TESTS
-
-    - BUILD=test DAV_SERVER=radicale RADICALE_BACKEND=filesystem
-      # Radicale-release with filesystem storage
-
-    - BUILD=test DAV_SERVER=radicale RADICALE_BACKEND=filesystem
-      PKGS='lxml==3.0 requests==2.4.1 requests_toolbelt==0.4.0 click==5.0'
-      # Minimal requirements
-
-    - BUILD=test DAV_SERVER=radicale RADICALE_BACKEND=filesystem REQUIREMENTS=devel
-      # Radicale-git with filesystem storage
-
-    - BUILD=test DAV_SERVER=owncloud
-      # Latest ownCloud release
-
-    - BUILD=test DAV_SERVER=baikal
-      # Latest Baikal release
 
 install:
     - "pip install -U pip"
     - "pip install wheel"
-    - "pip install -e ."
+    - "make -e install-dev"
     - "make -e install-$BUILD"
-    - '[ -z "$PKGS" ] || pip install $PKGS'
+
 script:
     - "make -e $BUILD"
+
+matrix:
+    include:
+        - python: 2.7
+          env: BUILD=style
+        - python: 2.7
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=devel
+        - python: 2.7
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=release
+        - python: 2.7
+          env: BUILD=test DAV_SERVER=owncloud REQUIREMENTS=devel
+        - python: 2.7
+          env: BUILD=test DAV_SERVER=owncloud REQUIREMENTS=release
+        - python: 2.7
+          env: BUILD=test DAV_SERVER=owncloud REQUIREMENTS=minimal
+        - python: 2.7
+          env: BUILD=test DAV_SERVER=baikal REQUIREMENTS=devel
+        - python: 2.7
+          env: BUILD=test DAV_SERVER=baikal REQUIREMENTS=release
+        - python: 2.7
+          env: BUILD=test DAV_SERVER=baikal REQUIREMENTS=minimal
+        - python: 3.3
+          env: BUILD=style
+        - python: 3.3
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=devel
+        - python: 3.3
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=release
+        - python: 3.4
+          env: BUILD=style
+        - python: 3.4
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=devel
+        - python: 3.4
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=release
+        - python: 3.5
+          env: BUILD=style
+        - python: 3.5
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=devel
+        - python: 3.5
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=release
+        - python: 3.5
+          env: BUILD=test DAV_SERVER=owncloud REQUIREMENTS=devel
+        - python: 3.5
+          env: BUILD=test DAV_SERVER=owncloud REQUIREMENTS=release
+        - python: 3.5
+          env: BUILD=test DAV_SERVER=owncloud REQUIREMENTS=minimal
+        - python: 3.5
+          env: BUILD=test DAV_SERVER=baikal REQUIREMENTS=devel
+        - python: 3.5
+          env: BUILD=test DAV_SERVER=baikal REQUIREMENTS=release
+        - python: 3.5
+          env: BUILD=test DAV_SERVER=baikal REQUIREMENTS=minimal
+        - python: pypy
+          env: BUILD=style
+        - python: pypy
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=devel
+        - python: pypy
+          env: BUILD=test DAV_SERVER=radicale REQUIREMENTS=release
+
+
diff --git a/Makefile b/Makefile
index 495c4fd..8db3bfe 100644
--- a/Makefile
+++ b/Makefile
@@ -50,6 +50,11 @@ style:
 	flake8
 	! grep -ri syncroniz */*
 	sphinx-build -W -b html ./docs/ ./docs/_build/html/
+	$(MAKE) travis-conf
+	git diff --exit-code
+
+travis-conf:
+	python3 scripts/make_travisconf.py > .travis.yml
 
 install-docs:
 	pip install sphinx sphinx_rtd_theme
@@ -69,4 +74,12 @@ all:
 release:
 	python setup.py sdist bdist_wheel upload
 
+install-dev:
+	pip install -e .
+	set -xe && if [ "$$REQUIREMENTS" = "devel" ]; then \
+	    pip install -U --force-reinstall git+https://github.com/kennethreitz/requests; \
+	elif [ "$$REQUIREMENTS" = "minimal" ]; then \
+		pip install -U --force-reinstall lxml==3.0 requests==2.4.1 requests_toolbelt==0.4.0 click==5.0; \
+	fi
+
 .PHONY: docs
diff --git a/scripts/make_travisconf.py b/scripts/make_travisconf.py
new file mode 100644
index 0000000..3b6f30e
--- /dev/null
+++ b/scripts/make_travisconf.py
@@ -0,0 +1,56 @@
+print("# Generated by scripts/make_travisconf.py")
+print("")
+
+import contextlib
+import itertools
+i = 0
+
+
+def p(s):
+    print("    " * i + s)
+
+
+@contextlib.contextmanager
+def section(name):
+    p("{}:".format(name))
+    global i
+    i += 1
+    yield
+    i -= 1
+    print("")
+
+p("sudo: true")
+p("language: python")
+p("")
+
+with section("install"):
+    p('- "pip install -U pip"')
+    p('- "pip install wheel"')
+    p('- "make -e install-dev"')
+    p('- "make -e install-$BUILD"')
+
+with section("script"):
+    p('- "make -e $BUILD"')
+
+with section("matrix"):
+    with section("include"):
+        for python in ("2.7", "3.3", "3.4", "3.5", "pypy"):
+            h = lambda: p("- python: {}".format(python))
+            h()
+            p("  env: BUILD=style")
+
+            if python in ("2.7", "3.5"):
+                dav_servers = ("radicale", "owncloud", "baikal")
+            else:
+                dav_servers = ("radicale",)
+
+            for dav_server, requirements in itertools.product(
+                dav_servers,
+                ("devel", "release", "minimal")
+            ):
+                if dav_server == "radicale" and requirements == "minimal":
+                    # only the latest radicale is supported
+                    continue
+                h()
+                p("  env: BUILD=test DAV_SERVER={} REQUIREMENTS={}"
+                  .format(dav_server, requirements))