tests: Presubmits - Added presubmit unit tests for KFP SDK (#4131)

test/presubmit-tests-sdk.sh

@@ -0,0 +1,41 @@
+#!/bin/bash -ex
+# Copyright 2020 Kubeflow Pipelines contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+source_root=$(pwd)
+
+python3 -m pip install --upgrade pip
+python3 -m pip install coverage==4.5.4 coveralls==1.9.2
+python3 -m pip install mock  # TODO: Remove when added to requirements
+python3 -m pip install -r "$source_root/sdk/python/requirements.txt"
+
+# Installing Argo CLI to lint all compiled workflows
+LOCAL_BIN="${HOME}/.local/bin"
+mkdir -p "$LOCAL_BIN"
+export PATH="${PATH}:$LOCAL_BIN" # Unnecessary - Travis already has it in PATH
+wget --quiet -O "${LOCAL_BIN}/argo" https://github.com/argoproj/argo/releases/download/v2.4.3/argo-linux-amd64 && chmod +x "${LOCAL_BIN}/argo"
+
+pushd "$source_root/sdk/python"
+python3 -m pip install -e .
+popd # Changing the current directory to the repo root for correct coverall paths
+coverage run --source=kfp --append -m unittest discover --verbose --start-dir sdk/python --pattern '*test*.py'
+
+set +x
+# export COVERALLS_REPO_TOKEN=$(gsutil cat gs://ml-pipeline-test-keys/coveralls_repo_token)
+set -x
+REPO_BASE="https://github.com/kubeflow/pipelines"
+export COVERALLS_SERVICE_NAME="prow"
+export COVERALLS_SERVICE_JOB_ID=$PROW_JOB_ID
+export CI_PULL_REQUEST="$REPO_BASE/pull/$PULL_NUMBER"
+# coveralls