diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml
index ff27b7c..ec1a074 100644
--- a/.github/workflows/pull_request.yaml
+++ b/.github/workflows/pull_request.yaml
@@ -4,34 +4,35 @@ on:
   push:
     branches:
     - 'master'
+    - 'main'
   pull_request:
 
+env:
+  KUBE_VERSION: v1.22.15
+
 jobs:
   test:
     name: Tests
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-22.04
     steps:
     - name: Cancel Previous Runs
-      uses: styfle/cancel-workflow-action@0.4.0
+      uses: styfle/cancel-workflow-action@0.11.0
       with:
         access_token: ${{ github.token }}
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 0
     - name: Set up Go 1.18.2
-      uses: actions/setup-go@v1
+      uses: actions/setup-go@v4
       with:
         go-version: 1.18.2
-    - uses: actions/cache@v1
+    - uses: azure/setup-kubectl@v3
       with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: |
-          ${{ runner.os }}-go
-    - uses: azure/setup-kubectl@v1
+        version: ${{ env.KUBE_VERSION }}
+    - name: Install kind
+      uses: helm/kind-action@v1.5.0
       with:
-        version: 'v1.18.0'
-    - uses: engineerd/setup-kind@v0.5.0
+        node_image: "kindest/node:${{ env.KUBE_VERSION }}"
     - name: Run tests
       run: |
         go install github.com/onsi/ginkgo/ginkgo@v1.16 && export PATH=$PATH:$(go env GOPATH)/bin/
diff --git a/changelog/v0.1.10/test-manifest.yaml b/changelog/v0.1.10/test-manifest.yaml
new file mode 100644
index 0000000..e080967
--- /dev/null
+++ b/changelog/v0.1.10/test-manifest.yaml
@@ -0,0 +1,3 @@
+changelog:
+  - type: NON_USER_FACING
+    description: Add new constructor (NewTestManifestFromYaml) that creates a TestManifest from a yaml string.
\ No newline at end of file
diff --git a/installutils/kuberesource/get_cluster_resources_test.go b/installutils/kuberesource/get_cluster_resources_test.go
index 7167092..26bcb41 100644
--- a/installutils/kuberesource/get_cluster_resources_test.go
+++ b/installutils/kuberesource/get_cluster_resources_test.go
@@ -57,7 +57,7 @@ var _ = Describe("GetClusterResources", func() {
 		Expect(err).NotTo(HaveOccurred())
 		expected := UnstructuredResources{expected1, expected2, expected3}
 
-		Expect(cmInOurNs).To(HaveLen(3))
+		Expect(cmInOurNs).To(HaveLen(3+1), "Expect our 3 ConfigMaps plus the default kube-root-ca.crt")
 		for i := range expected {
 			actual := cmInOurNs[i]
 			delete(actual.Object, "metadata")
diff --git a/manifesttestutils/util.go b/manifesttestutils/util.go
index 10a91fe..2c31541 100644
--- a/manifesttestutils/util.go
+++ b/manifesttestutils/util.go
@@ -59,12 +59,21 @@ type testManifest struct {
 	resources kuberesource.UnstructuredResources
 }
 
+// NewTestManifest creates a TestManifest by reading from the manifest file located at `relativePathToManifest`.
 func NewTestManifest(relativePathToManifest string) TestManifest {
 	return &testManifest{
-		resources: mustGetResources(relativePathToManifest),
+		resources: mustGetResourcesFromFile(relativePathToManifest),
 	}
 }
 
+// NewTestManifestFromYaml creates a TestManifest from the given manifest yaml.
+func NewTestManifestFromYaml(manifest string) TestManifest {
+	return &testManifest{
+		resources: mustGetResourcesFromYaml(manifest),
+	}
+}
+
+// NewTestManifestWithResources creates a TestManifest with the given resources.
 func NewTestManifestWithResources(resources kuberesource.UnstructuredResources) TestManifest {
 	return &testManifest{
 		resources: resources,
@@ -308,8 +317,12 @@ var (
 	yamlSeparator = regexp.MustCompile("\n---")
 )
 
-func mustGetResources(relativePathToManifest string) kuberesource.UnstructuredResources {
+func mustGetResourcesFromFile(relativePathToManifest string) kuberesource.UnstructuredResources {
 	manifest := mustReadManifest(relativePathToManifest)
+	return mustGetResourcesFromYaml(manifest)
+}
+
+func mustGetResourcesFromYaml(manifest string) kuberesource.UnstructuredResources {
 	snippets := yamlSeparator.Split(manifest, -1)
 
 	var resources kuberesource.UnstructuredResources