add more tests part 1

Author: cherylEnkidu

Firestore/Source/API/FIRPipelineBridge.mm

@@ -100,7 +100,7 @@ @implementation FIRFieldBridge {
   std::shared_ptr<Field> field;
 }
 
-- (id)init:(NSString *)name {
+- (id)initWithName:(NSString *)name {
   self = [super init];
   if (self) {
     field_path = [FIRFieldPath pathWithDotSeparatedString:name];
@@ -109,6 +109,15 @@ - (id)init:(NSString *)name {
   return self;
 }
 
+- (id)initWithPath:(FIRFieldPath *)path {
+  self = [super init];
+  if (self) {
+    field_path = path;
+    field = std::make_shared<Field>([field_path internalValue].CanonicalString());
+  }
+  return self;
+}
+
 - (std::shared_ptr<api::Expr>)cppExprWithReader:(FSTUserDataReader *)reader {
   return field;
 }

Firestore/Source/Public/FirebaseFirestore/FIRPipelineBridge.h

@@ -23,6 +23,7 @@
 @class FIRTimestamp;
 @class FIRVectorValue;
 @class FIRPipelineBridge;
+@class FIRFieldPath;
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -34,7 +35,8 @@ NS_SWIFT_NAME(ExprBridge)
 NS_SWIFT_SENDABLE
 NS_SWIFT_NAME(FieldBridge)
 @interface FIRFieldBridge : FIRExprBridge
-- (id)init:(NSString *)name;
+- (id)initWithName:(NSString *)name;
+- (id)initWithPath:(FIRFieldPath *)path;
 - (NSString *)field_name;
 @end
 

Firestore/Swift/Source/SwiftAPI/Pipeline/Expr/Field.swift

@@ -24,10 +24,17 @@ public class Field: ExprBridge, Expr, Selectable, BridgeWrapper, SelectableWrapp
 
   public let fieldName: String
 
-  public init(_ fieldName: String) {
-    let fieldBridge = FieldBridge(fieldName)
+  public init(_ name: String) {
+    let fieldBridge = FieldBridge(name: name)
     bridge = fieldBridge
-    self.fieldName = fieldBridge.field_name()
-    alias = self.fieldName
+    fieldName = fieldBridge.field_name()
+    alias = fieldName
+  }
+
+  public init(_ path: FieldPath) {
+    let fieldBridge = FieldBridge(path: path)
+    bridge = fieldBridge
+    fieldName = fieldBridge.field_name()
+    alias = fieldName
   }
 }