diff --git a/images/prow-tests/Dockerfile b/images/prow-tests/Dockerfile
index 07730b327f9..db6ea53c9b7 100644
--- a/images/prow-tests/Dockerfile
+++ b/images/prow-tests/Dockerfile
@@ -25,3 +25,4 @@ RUN go get github.com/google/go-containerregistry/cmd/ko
 
 # Add our scripts
 ADD scripts/library.sh .
+ADD scripts/presubmit-tests.sh .
diff --git a/images/prow-tests/scripts/presubmit-tests.sh b/images/prow-tests/scripts/presubmit-tests.sh
new file mode 100755
index 00000000000..c8dc66ed0b5
--- /dev/null
+++ b/images/prow-tests/scripts/presubmit-tests.sh
@@ -0,0 +1,122 @@
+#!/bin/bash
+
+# Copyright 2018 The Knative Authors
+#
+# 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.
+
+# This is a helper script to run the presubmit tests. To use it:
+# 1. Source this script.
+# 2. Define the functions build_tests(), unit_tests() and
+#    integration_tests(). They should run all tests (i.e., not fail
+#    fast), and return 0 if all passed, 1 if a failure occurred.
+#    The environment variables RUN_BUILD_TESTS, RUN_UNIT_TESTS and
+#    RUN_INTEGRATION_TESTS are set to 0 (false) or 1 (true) accordingly.
+#    If --emit-metrics is passed, EMIT_METRICS will be set to 1.
+# 3. Call the main() function passing $@ (without quotes).
+#
+# Running the script without parameters, or with the --all-tests
+# flag, causes all tests to be executed, in the right order.
+# Use the flags --build-tests, --unit-tests and --integration-tests
+# to run a specific set of tests. The flag --emit-metrics is used
+# to emit metrics when running the tests.
+
+# Load github.com/knative/test-infra/images/prow-tests/scripts/library.sh
+[ -f /workspace/library.sh ] \
+  && source /workspace/library.sh \
+  || eval "$(docker run --entrypoint sh gcr.io/knative-tests/test-infra/prow-tests -c 'cat library.sh')"
+[ -v KNATIVE_TEST_INFRA ] || exit 1
+
+# Extensions or file patterns that don't require presubmit tests.
+readonly NO_PRESUBMIT_FILES=(\.md \.png ^OWNERS)
+
+# Options set by command-line flags.
+RUN_BUILD_TESTS=0
+RUN_UNIT_TESTS=0
+RUN_INTEGRATION_TESTS=0
+EMIT_METRICS=0
+
+# Exit presubmit tests if only documentation files were changed.
+function exit_if_presubmit_not_required() {
+  if [[ -n "${PULL_PULL_SHA}" ]]; then
+    # On a presubmit job
+    local changes="$(git diff --name-only ${PULL_PULL_SHA} ${PULL_BASE_SHA})"
+    local no_presubmit_pattern="${NO_PRESUBMIT_FILES[*]}"
+    local no_presubmit_pattern="\(${no_presubmit_pattern// /\\|}\)$"
+    echo -e "Changed files in commit ${PULL_PULL_SHA}:\n${changes}"
+    if [[ -z "$(echo "${changes}" | grep -v ${no_presubmit_pattern})" ]]; then
+      # Nothing changed other than files that don't require presubmit tests
+      header "Commit only contains changes that don't affect tests, skipping"
+      exit 0
+    fi
+  fi
+}
+
+# Process flags and run tests accordingly.
+function main() {
+  exit_if_presubmit_not_required
+
+  local all_parameters=$@
+  [[ -z $1 ]] && all_parameters="--all-tests"
+
+  for parameter in ${all_parameters}; do
+    case ${parameter} in
+      --all-tests)
+        RUN_BUILD_TESTS=1
+        RUN_UNIT_TESTS=1
+        RUN_INTEGRATION_TESTS=1
+        shift
+        ;;
+      --build-tests)
+        RUN_BUILD_TESTS=1
+        shift
+        ;;
+      --unit-tests)
+        RUN_UNIT_TESTS=1
+        shift
+        ;;
+      --integration-tests)
+        RUN_INTEGRATION_TESTS=1
+        shift
+        ;;
+      --emit-metrics)
+        EMIT_METRICS=1
+        shift
+        ;;
+      *)
+        echo "error: unknown option ${parameter}"
+        exit 1
+        ;;
+    esac
+  done
+
+  readonly RUN_BUILD_TESTS
+  readonly RUN_UNIT_TESTS
+  readonly RUN_INTEGRATION_TESTS
+  readonly EMIT_METRICS
+
+  cd ${REPO_ROOT_DIR}
+
+  # Tests to be performed, in the right order if --all-tests is passed.
+
+  local result=0
+  if (( RUN_BUILD_TESTS )); then
+    build_tests || result=1
+  fi
+  if (( RUN_UNIT_TESTS )); then
+    unit_tests || result=1
+  fi
+  if (( RUN_INTEGRATION_TESTS )); then
+    integration_tests || result=1
+  fi
+  exit ${result}
+}