refactor: mv testdata to co-locate in the package of test (#2936)

Move testdata for docker/docker_test.go and librarian/state_test.go into
the same package. Removed some unused test data files.

For #2842

Author: zhumin8

internal/docker/docker_test.go

@@ -924,7 +924,7 @@ func TestWriteLibraryState(t *testing.T) {
 				t.Fatalf("Failed to read generated file: %v", err)
 			}
 
-			wantBytes, readErr := os.ReadFile(filepath.Join("../..", "testdata", "test-write-library-state", test.wantFile))
+			wantBytes, readErr := os.ReadFile(filepath.Join("testdata", "test-write-library-state", test.wantFile))
 			if readErr != nil {
 				t.Fatalf("Failed to read expected state for comparison: %v", readErr)
 			}
@@ -1035,7 +1035,7 @@ func TestWriteLibrarianState(t *testing.T) {
 				t.Fatalf("Failed to read generated file: %v", err)
 			}
 
-			wantBytes, readErr := os.ReadFile(filepath.Join("../..", "testdata", "test-write-librarian-state", test.wantFile))
+			wantBytes, readErr := os.ReadFile(filepath.Join("testdata", "test-write-librarian-state", test.wantFile))
 			if readErr != nil {
 				t.Fatalf("Failed to read expected state for comparison: %v", readErr)
 			}
@@ -1135,7 +1135,7 @@ func TestReleaseStageRequestContent(t *testing.T) {
 			t.Fatalf("ReadFile failed: %v", err)
 		}
 
-		wantFile := filepath.Join("..", "..", "testdata", "docker", "release-stage-request", "release-stage-request.json")
+		wantFile := filepath.Join("testdata", "release-stage-request", "release-stage-request.json")
 		wantBytes, err := os.ReadFile(wantFile)
 		if err != nil {
 			t.Fatalf("ReadFile for want file failed: %v", err)

…stage-request/release-stage-request.json …stage-request/release-stage-request.jsontestdata/docker/release-stage-request/release-stage-request.json renamed to internal/docker/testdata/release-stage-request/release-stage-request.json testdata/docker/release-stage-request/release-stage-request.json renamed to internal/docker/testdata/release-stage-request/release-stage-request.json

@@ -119,24 +119,24 @@ func TestFindServiceConfigIn(t *testing.T) {
 	}{
 		{
 			name: "find a service config",
-			path: filepath.Join("..", "..", "testdata", "find_a_service_config"),
+			path: filepath.Join("testdata", "find_a_service_config"),
 			want: "service_config.yaml",
 		},
 		{
 			name:    "non-existent source path",
-			path:    filepath.Join("..", "..", "testdata", "non-existent-path"),
+			path:    filepath.Join("testdata", "non-existent-path"),
 			want:    "",
 			wantErr: true,
 		},
 		{
 			name:    "no service config in a source path",
-			path:    filepath.Join("..", "..", "testdata", "no_service_config"),
+			path:    filepath.Join("testdata", "no_service_config"),
 			want:    "",
 			wantErr: false,
 		},
 		{
 			name:    "invalid yaml",
-			path:    filepath.Join("..", "..", "testdata", "invalid_yaml"),
+			path:    filepath.Join("testdata", "invalid_yaml"),
 			want:    "",
 			wantErr: true,
 		},
@@ -195,7 +195,7 @@ func TestParseGlobalConfig(t *testing.T) {
 		},
 	} {
 		t.Run(test.name, func(t *testing.T) {
-			path := filepath.Join("../../testdata/test-parse-global-config", test.filename)
+			path := filepath.Join("testdata", "test-parse-global-config", test.filename)
 			got, err := parseLibrarianConfig(path)
 			if test.wantErr {
 				if err == nil {
@@ -244,7 +244,7 @@ func TestPopulateServiceConfig(t *testing.T) {
 					},
 				},
 			},
-			path: filepath.Join("..", "..", "testdata", "populate_service_config"),
+			path: filepath.Join("testdata", "populate_service_config"),
 			want: &config.LibrarianState{
 				Libraries: []*config.LibraryState{
 					{
@@ -388,7 +388,7 @@ func TestReadLibraryState(t *testing.T) {
 		},
 	} {
 		t.Run(test.name, func(t *testing.T) {
-			path := filepath.Join("../../testdata/test-read-library-state", test.filename)
+			path := filepath.Join("testdata", "test-read-library-state", test.filename)
 			// The response file is removed by the readLibraryState() function,
 			// so we create a copy and read from it.
 			dstFilePath := filepath.Join(t.TempDir(), "copied-state", test.filename)