new template function semver_compare (#55)

Co-authored-by: Philipp Hempel <philipp.hempel@programmfabrik.de>

pkg/lib/template/template_loader.go

@@ -16,6 +16,7 @@ import (
 
 	"github.com/pkg/errors"
 	"github.com/programmfabrik/apitest/pkg/lib/datastore"
+	"golang.org/x/mod/semver"
 
 	"github.com/programmfabrik/apitest/pkg/lib/cjson"
 	"github.com/programmfabrik/apitest/pkg/lib/csv"
@@ -430,6 +431,15 @@ func (loader *Loader) Render(
 			}
 			return string(b)
 		},
+		"semver_compare": func(v, w string) (int, error) {
+			if !semver.IsValid(v) {
+				return 0, errors.Errorf("version string %s is invalid", v)
+			}
+			if !semver.IsValid(w) {
+				return 0, errors.Errorf("version string %s is invalid", w)
+			}
+			return semver.Compare(v, w), nil
+		},
 	}
 	tmpl, err := template.New("tmpl").Funcs(funcMap).Parse(string(tmplBytes))
 	if err != nil {

test/semver/manifest.json

@@ -0,0 +1,11 @@
+{
+    "http_server": {
+        "addr": ":9999",
+        "dir": "../_res",
+        "testmode": false
+    },
+    "name": "tests for semantic version comparisons (semver)",
+    "tests": [
+        "@test_semver_compare.json"
+    ]
+}

test/semver/test_semver_compare.json

@@ -0,0 +1,46 @@
+{
+    "name": "semantic version comparisons (semver)",
+    "request": {
+        "server_url": "http://localhost:9999",
+        "endpoint": "bounce-json",
+        "method": "POST",
+        "body": {
+            "semver_easydb_release": {{ semver_compare "v5.86.0" "v6.0.0" }},
+            "semver_easydb_patch": {{ semver_compare "v5.86.2" "v6.0.0" }},
+            "semver_lt": {{ semver_compare "v5.1.2" "v6.0.0" }},
+            "semver_eq": {{ semver_compare "v6.0.0" "v6.0.0" }},
+            "semver_gt": {{ semver_compare "v7.1.2" "v6.0.0" }}
+        }
+    },
+    "response": {
+        "statuscode": 200,
+        "body": {
+            "body": {
+                "semver_easydb_release:control": {
+                    "is_integer": true
+                },
+                "semver_easydb_release": -1,
+
+                "semver_easydb_patch:control": {
+                    "is_integer": true
+                },
+                "semver_easydb_patch": -1,
+
+                "semver_lt:control": {
+                    "is_integer": true
+                },
+                "semver_lt": -1,
+
+                "semver_eq:control": {
+                    "is_integer": true
+                },
+                "semver_eq": 0,
+
+                "semver_gt:control": {
+                    "is_integer": true
+                },
+                "semver_gt": 1
+            }
+        }
+    }
+}