tfversion: Finish prerelease version semantic equality handling

.changes/unreleased/BUG FIXES-20240328-180800.yaml

@@ -0,0 +1,5 @@
+kind: BUG FIXES
+body: 'tfversion: Fixed `RequireBelow` ignoring equal versioning to fail a test'
+time: 2024-03-28T18:08:00.236612-04:00
+custom:
+  Issue: "303"

.changes/unreleased/ENHANCEMENTS-20240327-171628.yaml

@@ -1,6 +1,7 @@
 kind: ENHANCEMENTS
-body: 'tfversion: Ensured semantically equivalent Terraform CLI prerelease versions
-  are considered equal to patch versions in `SkipBelow`'
+body: 'tfversion: Ensured Terraform CLI prerelease versions are considered
+  semantically equal to patch versions in built-in checks to match the Terraform CLI
+  versioning policy'
 time: 2024-03-27T17:16:28.49466-04:00
 custom:
   Issue: "303"

tfversion/require_above.go

@@ -11,9 +11,19 @@ import (
 )
 
 // RequireAbove will fail the test if the Terraform CLI
-// version is below the given version. For example, if given
-// version.Must(version.NewVersion("0.15.0")), then 0.14.x or
-// any other prior minor versions will fail the test.
+// version is exclusively below the given version. For example, if given
+// version.Must(version.NewVersion("1.8.0")), then 1.7.x or
+// any other prior versions will fail the test.
+//
+// Prereleases of Terraform CLI (whether alpha, beta, or rc) are considered
+// equal to a given patch version. For example, if given
+// version.Must(version.NewVersion("1.8.0")), then 1.8.0-rc1 will run, not fail,
+// the test. Terraform prereleases are considered as potential candidates for
+// the upcoming version and therefore are treated as semantically equal for
+// testing. If failing prereleases of the same patch release is desired, give a
+// higher prerelease version. For example, if given
+// version.Must(version.NewVersion("1.8.0-rc2")), then 1.8.0-rc1 will fail the
+// test.
 func RequireAbove(minimumVersion *version.Version) TerraformVersionCheck {
 	return requireAboveCheck{
 		minimumVersion: minimumVersion,
@@ -27,8 +37,17 @@ type requireAboveCheck struct {
 
 // CheckTerraformVersion satisfies the TerraformVersionCheck interface.
 func (r requireAboveCheck) CheckTerraformVersion(ctx context.Context, req CheckTerraformVersionRequest, resp *CheckTerraformVersionResponse) {
+	var terraformVersion *version.Version
 
-	if req.TerraformVersion.LessThan(r.minimumVersion) {
+	// If given a prerelease version, check the Terraform CLI version directly,
+	// otherwise use the core version so that prereleases are treated as equal.
+	if r.minimumVersion.Prerelease() != "" {
+		terraformVersion = req.TerraformVersion
+	} else {
+		terraformVersion = req.TerraformVersion.Core()
+	}
+
+	if terraformVersion.LessThan(r.minimumVersion) {
 		resp.Error = fmt.Errorf("expected Terraform CLI version above %s but detected version is %s",
 			r.minimumVersion, req.TerraformVersion)
 	}

tfversion/require_above_test.go

@@ -18,7 +18,7 @@ import (
 	testinginterface "github.com/mitchellh/go-testing-interface"
 )
 
-func Test_RequireAbove(t *testing.T) { //nolint:paralleltest
+func Test_RequireAbove_Equal(t *testing.T) { //nolint:paralleltest
 	t.Setenv("TF_ACC_TERRAFORM_PATH", "")
 	t.Setenv("TF_ACC_TERRAFORM_VERSION", "1.1.0")
 
@@ -41,7 +41,30 @@ func Test_RequireAbove(t *testing.T) { //nolint:paralleltest
 	})
 }
 
-func Test_RequireAbove_Error(t *testing.T) { //nolint:paralleltest
+func Test_RequireAbove_Higher(t *testing.T) { //nolint:paralleltest
+	t.Setenv("TF_ACC_TERRAFORM_PATH", "")
+	t.Setenv("TF_ACC_TERRAFORM_VERSION", "1.1.1")
+
+	r.UnitTest(t, r.TestCase{
+		ProtoV6ProviderFactories: map[string]func() (tfprotov6.ProviderServer, error){
+			"test": providerserver.NewProviderServer(testprovider.Provider{}),
+		},
+		TerraformVersionChecks: []tfversion.TerraformVersionCheck{
+			tfversion.RequireAbove(version.Must(version.NewVersion("1.1.0"))),
+		},
+		Steps: []r.TestStep{
+			{
+				//nullable argument only available in TF v1.1.0+
+				Config: `variable "a" {
+  					nullable = true
+					default  = "hello"
+				}`,
+			},
+		},
+	})
+}
+
+func Test_RequireAbove_Lower(t *testing.T) { //nolint:paralleltest
 	t.Setenv("TF_ACC_TERRAFORM_PATH", "")
 	t.Setenv("TF_ACC_TERRAFORM_VERSION", "1.0.7")
 
@@ -63,3 +86,137 @@ func Test_RequireAbove_Error(t *testing.T) { //nolint:paralleltest
 		})
 	})
 }
+
+func Test_RequireAbove_Prerelease_EqualCoreVersion(t *testing.T) { //nolint:paralleltest
+	t.Setenv("TF_ACC_TERRAFORM_PATH", "")
+	t.Setenv("TF_ACC_TERRAFORM_VERSION", "1.8.0-rc1")
+
+	// Pragmatic compromise that 1.8.0-rc1 prerelease is considered to
+	// be equivalent to the 1.8.0 core version. This enables developers
+	// to assert that prerelease versions are ran with upcoming
+	// core versions.
+	//
+	// Reference: https://github.com/hashicorp/terraform-plugin-testing/issues/303
+	r.UnitTest(t, r.TestCase{
+		ProtoV6ProviderFactories: map[string]func() (tfprotov6.ProviderServer, error){
+			"test": providerserver.NewProviderServer(testprovider.Provider{}),
+		},
+		TerraformVersionChecks: []tfversion.TerraformVersionCheck{
+			tfversion.RequireAbove(version.Must(version.NewVersion("1.8.0"))),
+		},
+		Steps: []r.TestStep{
+			{
+				Config: `//non-empty config`,
+			},
+		},
+	})
+}
+
+func Test_RequireAbove_Prerelease_EqualPrerelease(t *testing.T) { //nolint:paralleltest
+	t.Setenv("TF_ACC_TERRAFORM_PATH", "")
+	t.Setenv("TF_ACC_TERRAFORM_VERSION", "1.8.0-rc1")
+
+	r.UnitTest(t, r.TestCase{
+		ProtoV6ProviderFactories: map[string]func() (tfprotov6.ProviderServer, error){
+			"test": providerserver.NewProviderServer(testprovider.Provider{}),
+		},
+		TerraformVersionChecks: []tfversion.TerraformVersionCheck{
+			tfversion.RequireAbove(version.Must(version.NewVersion("1.8.0-rc1"))),
+		},
+		Steps: []r.TestStep{
+			{
+				Config: `//non-empty config`,
+			},
+		},
+	})
+}
+
+func Test_RequireAbove_Prerelease_HigherCoreVersion(t *testing.T) { //nolint:paralleltest
+	t.Setenv("TF_ACC_TERRAFORM_PATH", "")
+	t.Setenv("TF_ACC_TERRAFORM_VERSION", "1.7.0-rc1")
+
+	// The 1.7.0-rc1 prerelease should always be considered to be below the
+	// 1.8.0 core version. This intentionally verifies that the logic does not
+	// ignore the core version of the prerelease version when compared against
+	// the core version of the check.
+	plugintest.TestExpectTFatal(t, func() {
+		r.UnitTest(&testinginterface.RuntimeT{}, r.TestCase{
+			ProtoV6ProviderFactories: map[string]func() (tfprotov6.ProviderServer, error){
+				"test": providerserver.NewProviderServer(testprovider.Provider{}),
+			},
+			TerraformVersionChecks: []tfversion.TerraformVersionCheck{
+				tfversion.RequireAbove(version.Must(version.NewVersion("1.8.0"))),
+			},
+			Steps: []r.TestStep{
+				{
+					Config: `//non-empty config`,
+				},
+			},
+		})
+	})
+}
+
+func Test_RequireAbove_Prerelease_HigherPrerelease(t *testing.T) { //nolint:paralleltest
+	t.Setenv("TF_ACC_TERRAFORM_PATH", "")
+	t.Setenv("TF_ACC_TERRAFORM_VERSION", "1.7.0-rc1")
+
+	// The 1.7.0-rc1 prerelease should always be considered to be
+	// below the 1.7.0-rc2 prerelease.
+	plugintest.TestExpectTFatal(t, func() {
+		r.UnitTest(&testinginterface.RuntimeT{}, r.TestCase{
+			ProtoV6ProviderFactories: map[string]func() (tfprotov6.ProviderServer, error){
+				"test": providerserver.NewProviderServer(testprovider.Provider{}),
+			},
+			TerraformVersionChecks: []tfversion.TerraformVersionCheck{
+				tfversion.RequireAbove(version.Must(version.NewVersion("1.7.0-rc2"))),
+			},
+			Steps: []r.TestStep{
+				{
+					Config: `//non-empty config`,
+				},
+			},
+		})
+	})
+}
+
+func Test_RequireAbove_Prerelease_LowerCoreVersion(t *testing.T) { //nolint:paralleltest
+	t.Setenv("TF_ACC_TERRAFORM_PATH", "")
+	t.Setenv("TF_ACC_TERRAFORM_VERSION", "1.8.0-rc1")
+
+	// The 1.8.0-rc1 prerelease should always be considered to be
+	// above the 1.7.0 core version.
+	r.UnitTest(t, r.TestCase{
+		ProtoV6ProviderFactories: map[string]func() (tfprotov6.ProviderServer, error){
+			"test": providerserver.NewProviderServer(testprovider.Provider{}),
+		},
+		TerraformVersionChecks: []tfversion.TerraformVersionCheck{
+			tfversion.RequireAbove(version.Must(version.NewVersion("1.7.0"))),
+		},
+		Steps: []r.TestStep{
+			{
+				Config: `//non-empty config`,
+			},
+		},
+	})
+}
+
+func Test_RequireAbove_Prerelease_LowerPrerelease(t *testing.T) { //nolint:paralleltest
+	t.Setenv("TF_ACC_TERRAFORM_PATH", "")
+	t.Setenv("TF_ACC_TERRAFORM_VERSION", "1.8.0-rc1")
+
+	// The 1.8.0-rc1 prerelease should always be considered to be
+	// above the 1.8.0-beta1 prerelease.
+	r.UnitTest(t, r.TestCase{
+		ProtoV6ProviderFactories: map[string]func() (tfprotov6.ProviderServer, error){
+			"test": providerserver.NewProviderServer(testprovider.Provider{}),
+		},
+		TerraformVersionChecks: []tfversion.TerraformVersionCheck{
+			tfversion.RequireAbove(version.Must(version.NewVersion("1.8.0-beta1"))),
+		},
+		Steps: []r.TestStep{
+			{
+				Config: `//non-empty config`,
+			},
+		},
+	})
+}

tfversion/require_below.go

@@ -11,9 +11,19 @@ import (
 )
 
 // RequireBelow will fail the test if the Terraform CLI
-// version is above the given version. For example, if given
-// version.Must(version.NewVersion("0.15.0")), then versions 0.15.x and
+// version is inclusively above the given version. For example, if given
+// version.Must(version.NewVersion("1.8.0")), then versions 1.8.x and
 // above will fail the test.
+//
+// Prereleases of Terraform CLI (whether alpha, beta, or rc) are considered
+// equal to a given patch version. For example, if given
+// version.Must(version.NewVersion("1.8.0")), then 1.8.0-rc1 will fail, not run,
+// the test. Terraform prereleases are considered as potential candidates for
+// the upcoming version and therefore are treated as semantically equal for
+// testing purposes. If failing prereleases of the same patch release is
+// desired, give a lower prerelease version. For example, if given
+// version.Must(version.NewVersion("1.8.0-rc1")), then 1.8.0-rc2 will fail the
+// test.
 func RequireBelow(maximumVersion *version.Version) TerraformVersionCheck {
 	return requireBelowCheck{
 		maximumVersion: maximumVersion,
@@ -27,8 +37,17 @@ type requireBelowCheck struct {
 
 // CheckTerraformVersion satisfies the TerraformVersionCheck interface.
 func (s requireBelowCheck) CheckTerraformVersion(ctx context.Context, req CheckTerraformVersionRequest, resp *CheckTerraformVersionResponse) {
+	var terraformVersion *version.Version
 
-	if req.TerraformVersion.GreaterThan(s.maximumVersion) {
+	// If given a prerelease version, check the Terraform CLI version directly,
+	// otherwise use the core version so that prereleases are treated as equal.
+	if s.maximumVersion.Prerelease() != "" {
+		terraformVersion = req.TerraformVersion
+	} else {
+		terraformVersion = req.TerraformVersion.Core()
+	}
+
+	if terraformVersion.GreaterThanOrEqual(s.maximumVersion) {
 		resp.Error = fmt.Errorf("expected Terraform CLI version below %s but detected version is %s",
 			s.maximumVersion, req.TerraformVersion)
 	}