Create templates for global storage use

Two helper functions are defined:

- common.storageClass: will print the right storage class according to
  properties set or not:
  * if no storage class set --> use previous behavior (storage class
    named `common.fullname-data`.
  * if a "persistence.storageClassOverride" is set for this specific chart,
    we use it (if it's "-", we set to default one)
  * if a "global.persistence.storageClass" has been set (and no
    storageClassOverride for this chart), we use it (same specificity than
    storageClassOverride)
  * if a "persistence.storageClass) has been set (and no
    storageClassOverride nor global one), we use it (same specificity
    than storageClassOverride)

- common.needPV: will print "True" if we need a PV (no storageClass and
  storageClassOverride being set).

an implementation example with mariadb-galera is provided.

Issue-ID: OOM-1500
Change-Id: I20a667e17b00c255c4b828e3c66f9c0df7c8755c
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>

3 files changed, 108 insertions, 0 deletions

diff --git a/kubernetes/common/mariadb-galera/tests/pv_test.yaml b/kubernetes/common/mariadb-galera/tests/pv_test.yaml
new file mode 100644
index 0000000000..cd4007960b
--- /dev/null
+++ b/kubernetes/common/mariadb-galera/tests/pv_test.yaml
@@ -0,0 +1,35 @@
+---
+suite: test pv behavior
+templates:
+  - pv.yaml
+tests:
+  - it: 'should render "" (global case))'
+    values:
+      - ./values/persistence.yaml
+    set:
+      global.persistence.storageClass: "-"
+    asserts:
+      - isEmpty:
+
+  - it: 'should "" (override case)'
+    values:
+      - ./values/persistence.yaml
+    set:
+      global.persistence.storageClass: "global"
+      persistence.storageClassOverride: "-"
+    asserts:
+      - isEmpty:
+
+  - it: 'should "" (local case)'
+    values:
+      - ./values/persistence.yaml
+    set:
+      persistence.storageClass: "-"
+    asserts:
+      - isEmpty:
+
+  - it: 'should render "RELEASE-NAME-mariadb-galera-data" as storageClassname'
+    asserts:
+      - equal:
+          path: spec.storageClassName
+          value: "RELEASE-NAME-mariadb-galera-data"
diff --git a/kubernetes/common/mariadb-galera/tests/storage_class_test.yaml b/kubernetes/common/mariadb-galera/tests/storage_class_test.yaml
new file mode 100644
index 0000000000..9b7bdcb550
--- /dev/null
+++ b/kubernetes/common/mariadb-galera/tests/storage_class_test.yaml
@@ -0,0 +1,67 @@
+---
+suite: test storage class behavior
+templates:
+  - statefulset.yaml
+tests:
+  - it: 'should render "" as storageClassname (global case)'
+    values:
+      - ./values/persistence.yaml
+    set:
+      global.persistence.storageClass: "-"
+    asserts:
+      - isEmpty:
+          path: spec.volumeClaimTemplates[0].spec.storageClassName
+
+  - it: 'should "" as storageClassname (override case)'
+    values:
+      - ./values/persistence.yaml
+    set:
+      global.persistence.storageClass: "global"
+      persistence.storageClassOverride: "-"
+    asserts:
+      - isEmpty:
+          path: spec.volumeClaimTemplates[0].spec.storageClassName
+
+  - it: 'should "" as storageClassname (local case)'
+    values:
+      - ./values/persistence.yaml
+    set:
+      persistence.storageClass: "-"
+    asserts:
+      - isEmpty:
+          path: spec.volumeClaimTemplates[0].spec.storageClassName
+
+  - it: 'should render "global" as storageClassname'
+    values:
+      - ./values/persistence.yaml
+    set:
+      global.persistence.storageClass: "global"
+    asserts:
+      - equal:
+          path: spec.volumeClaimTemplates[0].spec.storageClassName
+          value: "global"
+
+  - it: 'should render "local" as storageClassname'
+    values:
+      - ./values/persistence.yaml
+    asserts:
+      - equal:
+          path: spec.volumeClaimTemplates[0].spec.storageClassName
+          value: "local"
+
+  - it: 'should render "override" as storageClassname'
+    values:
+      - ./values/persistence.yaml
+    set:
+      global.persistence.storageClass: "global"
+      persistence.storageClassOverride: "override"
+    asserts:
+      - equal:
+          path: spec.volumeClaimTemplates[0].spec.storageClassName
+          value: "override"
+
+  - it: 'should render "RELEASE-NAME-mariadb-galera-data" as storageClassname'
+    asserts:
+      - equal:
+          path: spec.volumeClaimTemplates[0].spec.storageClassName
+          value: "RELEASE-NAME-mariadb-galera-data"
diff --git a/kubernetes/common/mariadb-galera/tests/values/persistence.yaml b/kubernetes/common/mariadb-galera/tests/values/persistence.yaml
new file mode 100644
index 0000000000..a282f74318
--- /dev/null
+++ b/kubernetes/common/mariadb-galera/tests/values/persistence.yaml
@@ -0,0 +1,6 @@
+---
+persistence:
+  enabled: true
+  existingClaim: false
+  size: 10Gb
+  storageClass: "local"