diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index d28273a..ee3c2c9 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -19,3 +19,41 @@ jobs:
 
       - name: Lint with shellcheck
         run: make lint
+
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash -i {0}
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Mock cURL and wget
+        run: |
+          echo "REAL_CURL=$(which curl)" >> $GITHUB_ENV
+          echo "REAL_WGET=$(which wget)" >> $GITHUB_ENV
+          echo "$(pwd)/mocks/" >> $GITHUB_PATH
+
+      - name: Install g using g-install with default options
+        run: curl -sSL https://git.io/g-install | sh -s -- -y bash
+
+      - name: Verify environment variables
+        run: test ! -z "${GOROOT?}" && test ! -z "${GOPATH?}"
+
+      - name: Verify g installation
+        run: g --version
+
+      - name: Verify go installation
+        run: go version
+
+      - name: Make sure it is the go binary installed by g
+        run: test "$(which go)" = "$GOPATH/bin/go"
+
+      - name: Make sure g can switch versions
+        run: g install 1.14.15 && go version | grep -1 "go1.14.15"
+
+      - name: Make sure g can self-upgrade
+        run: SHELL="$(which bash)" g self-upgrade
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4d109f4..e4204ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
 - Upgrade shfmt from v3.0.0 to v3.2.4, no format changes introduced
 - Introduce a Github Actions workflow file with lint only for now
 - Fix g breaking on missing $TERM var in non-interactive systems
+- Add basic tests to the Github Actions workflow
 
 ## 0.8.0 - 2019-12-24
 
diff --git a/Makefile b/Makefile
index 65e4c16..bbc8d24 100644
--- a/Makefile
+++ b/Makefile
@@ -16,12 +16,12 @@ prepare: .tmp/shellcheck .tmp/shfmt
 
 .PHONY: lint
 lint: prepare
-	@./.tmp/shellcheck bin/*
-	@./.tmp/shfmt -d bin/*
+	@./.tmp/shellcheck bin/* mocks/*
+	@./.tmp/shfmt -d bin/* mocks/*
 
 .PHONY: format
 format: prepare
-	@./.tmp/shfmt -w bin/*
+	@./.tmp/shfmt -w bin/* mocks/*
 
 .tmp/shellcheck:
 	@echo "Downloading shellcheck"
diff --git a/mocks/curl b/mocks/curl
new file mode 100755
index 0000000..280832f
--- /dev/null
+++ b/mocks/curl
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# POSIX shell doesn't support errtrace nor pipefail.
+
+# Exit on error. Append "|| true" if you expect an error.
+set -o errexit
+# Do not allow use of undefined vars. Use ${VAR:-} to use an undefined VAR.
+set -o nounset
+
+BASE_DIR="$(dirname -- "$0")"
+G_URL="https://git.io/g-bin"
+G_LOCATION="$BASE_DIR/../bin/g"
+INSTALL_URL="https://git.io/g-install"
+INSTALL_LOCATION="$BASE_DIR/../bin/install"
+
+for item in "$@"; do
+  if [ "$item" = "$G_URL" ]; then
+    cat "$G_LOCATION"
+    return
+  elif [ "$item" = "$INSTALL_URL" ]; then
+    cat "$INSTALL_LOCATION"
+    return
+  fi
+done
+
+command "${REAL_CURL:?}" "$@"
diff --git a/mocks/wget b/mocks/wget
new file mode 100755
index 0000000..33124ca
--- /dev/null
+++ b/mocks/wget
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+# POSIX shell doesn't support errtrace nor pipefail.
+
+# Exit on error. Append "|| true" if you expect an error.
+set -o errexit
+# Do not allow use of undefined vars. Use ${VAR:-} to use an undefined VAR.
+set -o nounset
+
+BASE_DIR="$(dirname -- "$0")"
+G_URL="https://git.io/g-bin"
+G_LOCATION="$BASE_DIR/../bin/g"
+INSTALL_URL="https://git.io/g-install"
+INSTALL_LOCATION="$BASE_DIR/../bin/install"
+
+for item in "$@"; do
+  if [ "$item" = "$G_URL" ]; then
+    cat "$G_LOCATION"
+    return
+  elif [ "$item" = "$INSTALL_URL" ]; then
+    cat "$INSTALL_LOCATION"
+    return
+  fi
+done
+
+command "${REAL_WGET:?}" "$@"