backport of commit 57ef86b

internal/initwd/module_install_test.go

@@ -178,6 +178,54 @@ func TestModuleInstaller_explicitPackageBoundary(t *testing.T) {
 	}
 }
 
+func TestModuleInstaller_ExactMatchPrerelease(t *testing.T) {
+	if os.Getenv("TF_ACC") == "" {
+		t.Skip("this test accesses registry.terraform.io and github.com; set TF_ACC=1 to run it")
+	}
+
+	fixtureDir := filepath.Clean("testdata/prerelease-version-constraint-match")
+	dir, done := tempChdir(t, fixtureDir)
+	defer done()
+
+	hooks := &testInstallHooks{}
+
+	modulesDir := filepath.Join(dir, ".terraform/modules")
+	inst := NewModuleInstaller(modulesDir, registry.NewClient(nil, nil))
+	cfg, diags := inst.InstallModules(context.Background(), ".", false, hooks)
+
+	if diags.HasErrors() {
+		t.Fatalf("found unexpected errors: %s", diags.Err())
+	}
+
+	if !cfg.Children["acctest_exact"].Version.Equal(version.Must(version.NewVersion("v0.0.3-alpha.1"))) {
+		t.Fatalf("expected version %s but found version %s", "v0.0.3-alpha.1", cfg.Version.String())
+	}
+}
+
+func TestModuleInstaller_PartialMatchPrerelease(t *testing.T) {
+	if os.Getenv("TF_ACC") == "" {
+		t.Skip("this test accesses registry.terraform.io and github.com; set TF_ACC=1 to run it")
+	}
+
+	fixtureDir := filepath.Clean("testdata/prerelease-version-constraint")
+	dir, done := tempChdir(t, fixtureDir)
+	defer done()
+
+	hooks := &testInstallHooks{}
+
+	modulesDir := filepath.Join(dir, ".terraform/modules")
+	inst := NewModuleInstaller(modulesDir, registry.NewClient(nil, nil))
+	cfg, diags := inst.InstallModules(context.Background(), ".", false, hooks)
+
+	if diags.HasErrors() {
+		t.Fatalf("found unexpected errors: %s", diags.Err())
+	}
+
+	if !cfg.Children["acctest_partial"].Version.Equal(version.Must(version.NewVersion("v0.0.2"))) {
+		t.Fatalf("expected version %s but found version %s", "v0.0.2", cfg.Version.String())
+	}
+}
+
 func TestModuleInstaller_invalid_version_constraint_error(t *testing.T) {
 	fixtureDir := filepath.Clean("testdata/invalid-version-constraint")
 	dir, done := tempChdir(t, fixtureDir)

internal/initwd/testdata/prerelease-version-constraint-match/root.tf

@@ -0,0 +1,7 @@
+# We expect this test to download the requested version because it is an exact
+# match for a prerelease version.
+
+module "acctest_exact" {
+  source = "hashicorp/module-installer-acctest/aws"
+  version = "=0.0.3-alpha.1"
+}

internal/initwd/testdata/prerelease-version-constraint/root.tf

@@ -0,0 +1,8 @@
+# We expect this test to download the version 0.0.2, the one before the
+# specified version even with the equality because the specified version is a
+# prerelease.
+
+module "acctest_partial" {
+  source = "hashicorp/module-installer-acctest/aws"
+  version = "<=0.0.3-alpha.1"
+}