Add basic end to end tests

Signed-off-by: Nikolai Mishin <[email protected]>

Makefile

@@ -14,7 +14,7 @@
 # limitations under the License.
 #
 
-.PHONY: build test clean
+.PHONY: build test e2e_test clean
 
 ##@ General
 help: ## Display this help.
@@ -50,6 +50,10 @@ lint: ## Run Go linter
 test: ## Run Go tests
 	go test ./...
 
+##@ E2e_test
+e2e_test: build ## Run e2e Go tests
+	TENV_BIN="$(CURDIR)/build/tenv" go test -tags=e2e ./test/e2e/... -v 
+
 ##@ Clean
 clean:
-	rm -f ./build
+	rm -f ./build

test/e2e/e2e_test.go

@@ -0,0 +1,68 @@
+//go:build e2e
+
+package e2e
+
+import (
+	"bytes"
+	"os/exec"
+	"os"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestInstallTerraform(t *testing.T) {
+        tenvBin := os.Getenv("TENV_BIN")
+
+	cmd := exec.Command(tenvBin, "tf", "install", "1.10.5", "-v")
+
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	cmd.Stderr = &out
+
+	err := cmd.Run()
+
+ 	require.NoError(t, err, "Expected no error during the installation process")
+	require.Contains(t, out.String(), "Installing Terraform 1.10.5")
+	require.Contains(t, out.String(), "Installation of Terraform 1.10.5 successful")
+}
+
+func TestTFenvVersionEnvVariable(t *testing.T) {
+        tenvBin := os.Getenv("TENV_BIN")
+
+        cmd := exec.Command(tenvBin, "tf", "detect")
+
+        env := os.Environ()
+        env = append(env, "TFENV_TERRAFORM_VERSION=1.10.0")
+        cmd.Env = env
+
+        var out bytes.Buffer
+        cmd.Stdout = &out
+        cmd.Stderr = &out
+
+        err := cmd.Run()
+
+        require.NoError(t, err, "Expected no error during the installation process")
+        require.NotContains(t, out.String(), "Installation of Terraform 1.10.0 successful") 
+        require.Contains(t, out.String(), "Resolved version from TFENV_TERRAFORM_VERSION : 1.10.0")
+}
+
+func TestTFenvVersionEnvVariableInstall(t *testing.T) {
+        tenvBin := os.Getenv("TENV_BIN")
+
+        cmd := exec.Command(tenvBin, "tf", "detect", "-i")
+
+        env := os.Environ()
+        env = append(env, "TFENV_TERRAFORM_VERSION=1.10.0")
+        cmd.Env = env
+
+        var out bytes.Buffer
+        cmd.Stdout = &out
+        cmd.Stderr = &out
+
+        err := cmd.Run()
+
+        require.NoError(t, err, "Expected no error during the installation process")
+        require.Contains(t, out.String(), "Installing Terraform 1.10.0")
+        require.Contains(t, out.String(), "Installation of Terraform 1.10.0 successful")
+}