Refactor config and split them in packages (#8351)

This change is related to larger config migration PR
change, this is a first stage change to move our
configs to `cmd/config/` - divided into its subsystems

cmd/config/cache/config_test.go

@@ -0,0 +1,114 @@
+/*
+ * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cache
+
+import (
+	"reflect"
+	"runtime"
+	"strings"
+	"testing"
+)
+
+// Tests cache drive parsing.
+func TestParseCacheDrives(t *testing.T) {
+	testCases := []struct {
+		driveStr         string
+		expectedPatterns []string
+		success          bool
+	}{
+		// valid input
+
+		{"bucket1/*;*.png;images/trip/barcelona/*", []string{}, false},
+		{"bucket1", []string{}, false},
+	}
+	if runtime.GOOS == "windows" {
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"C:/home/drive1;C:/home/drive2;C:/home/drive3", []string{"C:/home/drive1", "C:/home/drive2", "C:/home/drive3"}, true})
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"C:/home/drive{1...3}", []string{"C:/home/drive1", "C:/home/drive2", "C:/home/drive3"}, true})
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"C:/home/drive{1..3}", []string{}, false})
+	} else {
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"/home/drive1;/home/drive2;/home/drive3", []string{"/home/drive1", "/home/drive2", "/home/drive3"}, true})
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"/home/drive{1...3}", []string{"/home/drive1", "/home/drive2", "/home/drive3"}, true})
+		testCases = append(testCases, struct {
+			driveStr         string
+			expectedPatterns []string
+			success          bool
+		}{"/home/drive{1..3}", []string{}, false})
+	}
+	for i, testCase := range testCases {
+		drives, err := parseCacheDrives(strings.Split(testCase.driveStr, cacheEnvDelimiter))
+		if err != nil && testCase.success {
+			t.Errorf("Test %d: Expected success but failed instead %s", i+1, err)
+		}
+		if err == nil && !testCase.success {
+			t.Errorf("Test %d: Expected failure but passed instead", i+1)
+		}
+		if err == nil {
+			if !reflect.DeepEqual(drives, testCase.expectedPatterns) {
+				t.Errorf("Test %d: Expected %v, got %v", i+1, testCase.expectedPatterns, drives)
+			}
+		}
+	}
+}
+
+// Tests cache exclude parsing.
+func TestParseCacheExclude(t *testing.T) {
+	testCases := []struct {
+		excludeStr       string
+		expectedPatterns []string
+		success          bool
+	}{
+		// valid input
+		{"/home/drive1;/home/drive2;/home/drive3", []string{}, false},
+		{"bucket1/*;*.png;images/trip/barcelona/*", []string{"bucket1/*", "*.png", "images/trip/barcelona/*"}, true},
+		{"bucket1", []string{"bucket1"}, true},
+	}
+
+	for i, testCase := range testCases {
+		excludes, err := parseCacheExcludes(strings.Split(testCase.excludeStr, cacheEnvDelimiter))
+		if err != nil && testCase.success {
+			t.Errorf("Test %d: Expected success but failed instead %s", i+1, err)
+		}
+		if err == nil && !testCase.success {
+			t.Errorf("Test %d: Expected failure but passed instead", i+1)
+		}
+		if err == nil {
+			if !reflect.DeepEqual(excludes, testCase.expectedPatterns) {
+				t.Errorf("Test %d: Expected %v, got %v", i+1, testCase.expectedPatterns, excludes)
+			}
+		}
+	}
+}