test(): Add dependency injection infrastructure for comprehensive unit testing

TESTING.md

@@ -0,0 +1,73 @@
+# Testing Strategy
+
+This document outlines the testing strategy for `kubeslice-cli`. We use a two-layered approach: **Unit Tests** for logic isolation & **Integration Tests** for real-world verification.
+
+## 1. Test Architecture
+
+| Type | Location | Purpose | Methodology |
+| :--- | :--- | :--- | :--- |
+| **Unit Tests** | `_test.go` | Verify internal logic, argument parsing & error handling. | Uses **Fakes** (`FakeExecutor`, `FakeFileSystem`) to test in isolation. |
+| **Integration Tests** | `_integration_test.go` | Verify interaction with the host system & external binaries. | Uses **Real Binaries** (`kind`, `helm`, `kubectl`, `docker`) and real file system operations. |
+
+---
+
+## 2. Integration Test Scenarios
+
+The following scenarios are covered by the integration suite in `pkg/internal/`. These tests run against a live environment to ensure end-to-end reliability.
+
+### A. Environment Verification (`verify-executables`)
+* **Kind Profile:** Verifies that `kind`, `kubectl`, `docker`, & `helm` are correctly detected on the host.
+* **Non-Kind Profile:** Verifies that only `kubectl` and `helm` are checked when `kind` is not required.
+* **Failure Handling:** Simulates a missing binary to ensure the CLI exits gracefully with the correct error message.
+
+### B. Helm Repo Operations (`helm-repo-add`)
+* **Add Repo:** Verifies the CLI can successfully add a public Helm repository using the real `helm` binary.
+* **Local Skip:** Verifies that the `UseLocal: true` configuration correctly skips helm operations.
+* **Failure Handling:** Verifies that adding a non-existent repository URL triggers a failure.
+
+### C. Cluster Lifecycle (`kind-clusters`)
+* **Create Cluster:** Uses the `kind` binary to spin up real Docker containers for the cluster.
+* **Idempotency:** Runs creation twice to ensure the CLI correctly **skips** clusters that already exist.
+* **Delete Cluster:** Verifies successful deletion of clusters.
+* **Kubeconfig:** Verifies the generation of the `kubeconfig.yaml` file on the real file system.
+* **Environment:** Verifies the `KUBECONFIG` environment variable is set correctly.
+
+### D. Network Discovery (`get-network-info`)
+* **Kind Path:** Verifies retrieval of the Control Plane IP using `docker inspect` (used for Kind clusters).
+* **Non-Kind Path:** Verifies retrieval of connection info using `kubectl config view` and `kubectl get nodes` (used for Cloud/DC clusters).
+* **Failure Handling:** Verifies the CLI fails correctly when inspecting a non-existent cluster.
+
+### E. Kubernetes Operations (`kubernetes-operation`)
+* **Apply Manifest:** Applies a real Kubernetes manifest (ConfigMap) to a running cluster.
+* **Get Resources:** Uses `kubectl get` to verify resources were created successfully.
+* **Describe Resources:** Uses `kubectl describe` to inspect system resources.
+* **Delete Resources:** Deletes a resource and verifies it is removed from the cluster.
+
+---
+
+## 3. How to Run Tests
+
+### Prerequisites
+Ensure the following tools are installed and in your `$PATH`:
+* `go` (v1.17+)
+* `docker` (Daemon must be running)
+* `kind`
+* `kubectl`
+* `helm`
+
+### Commands
+
+**Run Unit Tests Only** (Fast)
+```bash
+make test-unit
+```
+
+**Run Integration Tests Only** (Slower)
+```bash
+make test-integration
+```
+
+**Run All Tests**
+```bash
+make test
+```

go.mod

@@ -5,14 +5,18 @@ go 1.17
 require (
 	github.com/go-yaml/yaml v2.1.0+incompatible
 	github.com/spf13/cobra v1.6.1
+	github.com/stretchr/testify v1.11.1
 	gopkg.in/yaml.v2 v2.4.0
 	sigs.k8s.io/yaml v1.2.0
 )
 
 require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/tidwall/gjson v1.14.2 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
 	github.com/tidwall/pretty v1.2.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
 require (

go.sum

@@ -1,15 +1,27 @@
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/go-yaml/yaml v2.1.0+incompatible h1:RYi2hDdss1u4YE7GwixGzWwVo47T8UQwnTLB6vQiq+o=
 github.com/go-yaml/yaml v2.1.0+incompatible/go.mod h1:w2MrLa16VYP0jy6N7M5kHaCkaLENm+P+Tv+MfurjSw0=
 github.com/inconshreveable/mousetrap v1.0.1 h1:U3uMjPSQEBMNp1lFxmllqCPM6P5u/Xq7Pgzkat/bFNc=
 github.com/inconshreveable/mousetrap v1.0.1/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/spf13/cobra v1.6.1 h1:o94oiPyS4KD1mPy2fmcYYHHfCxLqYjJOhGsCHFZtEzA=
 github.com/spf13/cobra v1.6.1/go.mod h1:IOw/AERYS7UzyrGinqmz6HLUo219MORXGxhbaJUqzrY=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/objx v0.5.2/go.mod h1:FRsXN1f5AsAjCGJKqEizvkpNtU+EGNCLh3NxZ/8L+MA=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
+github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 github.com/tidwall/gjson v1.14.2 h1:6BBkirS0rAHjumnjHF6qgy5d2YAJ1TLIaFE2lzfOLqo=
 github.com/tidwall/gjson v1.14.2/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
 github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
@@ -23,6 +35,8 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

pkg/internal/cert-manager-setup.go

@@ -2,12 +2,14 @@ package internal
 
 import (
 	"fmt"
-	"log"
 	"time"
 
 	"github.com/kubeslice/kubeslice-cli/util"
 )
 
+// Function variable for testing - Allows mocking PodVerification in tests
+var podVerificationFunc = PodVerification
+
 func InstallCertManager(ApplicationConfiguration *ConfigurationSpecs) {
 
 	cc := ApplicationConfiguration.Configuration.ClusterConfiguration
@@ -16,10 +18,10 @@ func InstallCertManager(ApplicationConfiguration *ConfigurationSpecs) {
 
 	installCertManager(cc.ControllerCluster, hc)
 	util.Printf("%s Successfully installed helm chart %s/%s", util.Tick, hc.RepoAlias, hc.CertManagerChart.ChartName)
-	time.Sleep(200 * time.Millisecond)
+	util.Sleep(200 * time.Millisecond)
 
 	util.Printf("%s Waiting for Cert Manager Pods to be Healthy...", util.Wait)
-	PodVerification("Waiting for Cert Manager Pods to be Healthy", cc.ControllerCluster, "cert-manager")
+	podVerificationFunc("Waiting for Cert Manager Pods to be Healthy", cc.ControllerCluster, "cert-manager")
 
 	util.Printf("%s Successfully installed cert manager.\n", util.Tick)
 
@@ -47,7 +49,7 @@ func installCertManager(cluster Cluster, hc HelmChartConfiguration) {
 	}
 	err := util.RunCommand("helm", args...)
 	if err != nil {
-		log.Fatalf("Process failed %v", err)
+		util.Fatalf("Process failed %v", err)
 	}
 }
 func uninstallCertManager(cluster Cluster, hc HelmChartConfiguration) error {