generate py_test without __test__ (#999)

gazelle/generate.go

diff --git a/gazelle/generate.go b/gazelle/generate.go
index c7b0709..ac0ba6b 100644
--- a/gazelle/generate.go
+++ b/gazelle/generate.go
@@ -69,10 +69,10 @@
 	// this package or not.
 	hasPyBinary := false
 
-	// hasPyTestFile and hasPyTestTarget control whether a py_test target should
+	// hasPyTestEntryPointFile and hasPyTestEntryPointTarget control whether a py_test target should
 	// be generated for this package or not.
-	hasPyTestFile := false
-	hasPyTestTarget := false
+	hasPyTestEntryPointFile := false
+	hasPyTestEntryPointTarget := false
 	hasConftestFile := false
 
 	for _, f := range args.RegularFiles {
@@ -82,8 +82,8 @@
 		ext := filepath.Ext(f)
 		if !hasPyBinary && f == pyBinaryEntrypointFilename {
 			hasPyBinary = true
-		} else if !hasPyTestFile && f == pyTestEntrypointFilename {
-			hasPyTestFile = true
+		} else if !hasPyTestEntryPointFile && f == pyTestEntrypointFilename {
+			hasPyTestEntryPointFile = true
 		} else if f == conftestFilename {
 			hasConftestFile = true
 		} else if strings.HasSuffix(f, "_test.py") || (strings.HasPrefix(f, "test_") && ext == ".py") {
@@ -95,10 +95,10 @@
 
 	// If a __test__.py file was not found on disk, search for targets that are
 	// named __test__.
-	if !hasPyTestFile && args.File != nil {
+	if !hasPyTestEntryPointFile && args.File != nil {
 		for _, rule := range args.File.Rules {
 			if rule.Name() == pyTestEntrypointTargetname {
-				hasPyTestTarget = true
+				hasPyTestEntryPointTarget = true
 				break
 			}
 		}
@@ -185,13 +185,6 @@
 
 	collisionErrors := singlylinkedlist.New()
 
-	if !hasPyTestFile && !hasPyTestTarget {
-		it := pyTestFilenames.Iterator()
-		for it.Next() {
-			pyLibraryFilenames.Add(it.Value())
-		}
-	}
-
 	var pyLibrary *rule.Rule
 	if !pyLibraryFilenames.Empty() {
 		deps, err := parser.parse(pyLibraryFilenames)
@@ -309,19 +302,12 @@
 		result.Imports = append(result.Imports, conftest.PrivateAttr(config.GazelleImportsKey))
 	}
 
-	if hasPyTestFile || hasPyTestTarget {
-		if hasPyTestFile {
-			// Only add the pyTestEntrypointFilename to the pyTestFilenames if
-			// the file exists on disk.
-			pyTestFilenames.Add(pyTestEntrypointFilename)
-		}
+	var pyTestTargets []*targetBuilder
+	newPyTestTargetBuilder := func(pyTestFilenames *treeset.Set, pyTestTargetName string) *targetBuilder {
 		deps, err := parser.parse(pyTestFilenames)
 		if err != nil {
 			log.Fatalf("ERROR: %v\n", err)
 		}
-
-		pyTestTargetName := cfg.RenderTestName(packageName)
-
 		// Check if a target with the same name we are generating already
 		// exists, and if it is of a different kind from the one we are
 		// generating. If so, we have to throw an error since Gazelle won't
@@ -338,13 +324,21 @@
 				}
 			}
 		}
-
-		pyTestTarget := newTargetBuilder(pyTestKind, pyTestTargetName, pythonProjectRoot, args.Rel).
+		return newTargetBuilder(pyTestKind, pyTestTargetName, pythonProjectRoot, args.Rel).
 			addSrcs(pyTestFilenames).
 			addModuleDependencies(deps).
 			generateImportsAttribute()
+	}
+	if hasPyTestEntryPointFile || hasPyTestEntryPointTarget {
+		if hasPyTestEntryPointFile {
+			// Only add the pyTestEntrypointFilename to the pyTestFilenames if
+			// the file exists on disk.
+			pyTestFilenames.Add(pyTestEntrypointFilename)
+		}
+		pyTestTargetName := cfg.RenderTestName(packageName)
+		pyTestTarget := newPyTestTargetBuilder(pyTestFilenames, pyTestTargetName)
 
-		if hasPyTestTarget {
+		if hasPyTestEntryPointTarget {
 			entrypointTarget := fmt.Sprintf(":%s", pyTestEntrypointTargetname)
 			main := fmt.Sprintf(":%s", pyTestEntrypointFilename)
 			pyTestTarget.
@@ -354,7 +348,17 @@
 		} else {
 			pyTestTarget.setMain(pyTestEntrypointFilename)
 		}
+		pyTestTargets = append(pyTestTargets, pyTestTarget)
+	} else {
+		// Create one py_test target per file
+		pyTestFilenames.Each(func(index int, testFile interface{}) {
+			srcs := treeset.NewWith(godsutils.StringComparator, testFile)
+			pyTestTargetName := strings.TrimSuffix(filepath.Base(testFile.(string)), ".py")
+			pyTestTargets = append(pyTestTargets, newPyTestTargetBuilder(srcs, pyTestTargetName))
+		})
+	}
 
+	for _, pyTestTarget := range pyTestTargets {
 		if pyLibrary != nil {
 			pyTestTarget.addModuleDependency(module{Name: pyLibrary.PrivateAttr(uuidKey).(string)})
 		}

gazelle/testdata/python_target_with_test_in_name/BUILD.out

diff --git a/gazelle/testdata/python_target_with_test_in_name/BUILD.out b/gazelle/testdata/python_target_with_test_in_name/BUILD.out
index 72a648f..a46f5c4 100644
--- a/gazelle/testdata/python_target_with_test_in_name/BUILD.out
+++ b/gazelle/testdata/python_target_with_test_in_name/BUILD.out
@@ -1,12 +1,22 @@
-load("@rules_python//python:defs.bzl", "py_library")
+load("@rules_python//python:defs.bzl", "py_library", "py_test")
 
 py_library(
     name = "python_target_with_test_in_name",
-    srcs = [
-        "__init__.py",
-        "not_a_real_test.py",
-        "test_not_a_real.py",
-    ],
+    srcs = ["__init__.py"],
     visibility = ["//:__subpackages__"],
-    deps = ["@gazelle_python_test_boto3//:pkg"],
+)
+
+py_test(
+    name = "real_test",
+    srcs = ["real_test.py"],
+    deps = [
+        ":python_target_with_test_in_name",
+        "@gazelle_python_test_boto3//:pkg",
+    ],
+)
+
+py_test(
+    name = "test_reality",
+    srcs = ["test_reality.py"],
+    deps = [":python_target_with_test_in_name"],
 )

gazelle/testdata/python_target_with_test_in_name/real_test.py

diff --git a/gazelle/testdata/python_target_with_test_in_name/not_a_real_test.py b/gazelle/testdata/python_target_with_test_in_name/real_test.py
similarity index 100%
rename from gazelle/testdata/python_target_with_test_in_name/not_a_real_test.py
rename to gazelle/testdata/python_target_with_test_in_name/real_test.py

gazelle/testdata/python_target_with_test_in_name/test_reality.py

diff --git a/gazelle/testdata/python_target_with_test_in_name/test_not_a_real.py b/gazelle/testdata/python_target_with_test_in_name/test_reality.py
similarity index 100%
rename from gazelle/testdata/python_target_with_test_in_name/test_not_a_real.py
rename to gazelle/testdata/python_target_with_test_in_name/test_reality.py