Add validation test for disk encryption set name

azurerm/internal/services/compute/validation_test.go

@@ -254,3 +254,81 @@ func TestParseVirtualMachineScaleSetID(t *testing.T) {
 		}
 	}
 }
+
+func TestValidateDiskEncryptionSetName(t *testing.T) {
+	testData := []struct {
+		input    string
+		expected bool
+	}{
+		{
+			// empty
+			input:    "",
+			expected: false,
+		},
+		{
+			//basic example
+			input:    "hello",
+			expected: true,
+		},
+		{
+			// can't start with an underscore
+			input:    "_hello",
+			expected: false,
+		},
+		{
+			// can't start with dot
+			input:    ".hello",
+			expected: false,
+		},
+		{
+			// dot in middle
+			input:    "hello.world",
+			expected: true,
+		},
+		{
+			// hyphen in middle
+			input:    "hello-world",
+			expected: true,
+		},
+		{
+			// can't end with hyphen
+			input:    "helloworld-",
+			expected: false,
+		},
+		{
+			// can't contain an exclamation mark
+			input:    "hello!",
+			expected: false,
+		},
+		{
+			// can't end with dot
+			input:    "hello.",
+			expected: false,
+		},
+		{
+			// underscore at end
+			input:    "helloworld_",
+			expected: true,
+		},
+		{
+			// 80 characters
+			input:    "abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcde",
+			expected: true,
+		},
+		{
+			// 81 characters
+			input:    "abcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdeabcdef",
+			expected: false,
+		},
+	}
+
+	for _, v := range testData {
+		t.Logf("[DEBUG] Testing %q...", v.input)
+
+		_, errors := validateDiskEncryptionSetName(v.input, "name")
+		actual := len(errors) == 0
+		if v.expected != actual {
+			t.Fatalf("Expected %t but got %t", v.expected, actual)
+		}
+	}
+}