tests: migrate ops test to bats

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tests/ops/load/invalid/cache/main.cue

@@ -0,0 +1,33 @@
+package testing
+
+test1: {
+	string
+
+	#up: [
+		{
+			do: "load"
+			from: [{do: "fetch-container", ref: "alpine"}]
+		},
+		{
+			do:     "export"
+			source: "/etc/issue"
+			format: "string"
+		},
+	]
+}
+
+test2: {
+	string
+
+	#up: [
+		{
+			do: "load"
+			from: [{do: "fetch-container", ref: "busybox"}]
+		},
+		{
+			do:     "export"
+			source: "/etc/issue"
+			format: "string"
+		},
+	]
+}