diff --git a/go.mod b/go.mod
index 54365343..5781f1af 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module github.com/charmbracelet/lipgloss
 go 1.15
 
 require (
+	github.com/cockroachdb/datadriven v1.0.2
 	github.com/knz/lipgloss-convert v0.1.1
 	github.com/mattn/go-runewidth v0.0.13
 	github.com/muesli/reflow v0.2.1-0.20210115123740-9e1d0d53df68
diff --git a/go.sum b/go.sum
index ca30f0c2..b1ee2fd5 100644
--- a/go.sum
+++ b/go.sum
@@ -1,4 +1,6 @@
 github.com/charmbracelet/lipgloss v0.5.0/go.mod h1:EZLha/HbzEt7cYqdFPovlqy5FZPj0xFhg5SaqxScmgs=
+github.com/cockroachdb/datadriven v1.0.2 h1:H9MtNqVoVhvd9nCBwOyDjUEdZCREqbIdCJD93PBm/jA=
+github.com/cockroachdb/datadriven v1.0.2/go.mod h1:a9RdTaap04u637JoCzcUoIcDmvwSUtcUFtT/C3kJlTU=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/knz/lipgloss-convert v0.1.1 h1:11Wfcdif9jyyI5H3ohANyqkmIpVPjiBoGZdCzPWz9fA=
 github.com/knz/lipgloss-convert v0.1.1/go.mod h1:S14GmtoiW/VAHqB7xEzuZOt0/G6GQ2dfjJN0fHpm30Q=
diff --git a/style_test.go b/style_test.go
index e3c6599d..e321d3b3 100644
--- a/style_test.go
+++ b/style_test.go
@@ -6,7 +6,9 @@ import (
 	"testing"
 
 	"github.com/charmbracelet/lipgloss"
+	"github.com/cockroachdb/datadriven"
 	lipglossc "github.com/knz/lipgloss-convert"
+	"github.com/muesli/termenv"
 )
 
 func BenchmarkStyleRender(b *testing.B) {
@@ -115,8 +117,8 @@ func Example_frame() {
 
 type S = lipgloss.Style
 
-// TestStyle validates most of the Get, Set and Unset methods.
-func TestStyle(t *testing.T) {
+// TestStyleMethods validates most of the Get, Set and Unset methods.
+func TestStyleMethod(t *testing.T) {
 	g := lipgloss.Color("#0f0")
 	r := lipgloss.Color("#f00")
 	b := lipgloss.Color("#00f")
@@ -255,3 +257,63 @@ func TestStyle(t *testing.T) {
 		}
 	}
 }
+
+func TestRender(t *testing.T) {
+	curProfile := lipgloss.ColorProfile()
+	defer lipgloss.SetColorProfile(curProfile)
+
+	lipgloss.SetColorProfile(termenv.TrueColor)
+
+	datadriven.Walk(t, "testdata", func(t *testing.T, path string) {
+		d := driver{
+			s:    lipgloss.NewStyle(),
+			text: "hello!",
+		}
+		datadriven.RunTest(t, path, func(t *testing.T, td *datadriven.TestData) string {
+			return d.renderTest(t, td)
+		})
+	})
+}
+
+type driver struct {
+	s      lipgloss.Style
+	text   string
+	spaces bool
+}
+
+func (d *driver) renderTest(t *testing.T, td *datadriven.TestData) string {
+	switch td.Cmd {
+	case "text":
+		d.text = td.Input
+		return "ok"
+
+	case "spvis":
+		d.spaces = !d.spaces
+		return "ok"
+
+	case "show":
+		return lipglossc.Export(d.s)
+
+	case "set":
+		newStyle, err := lipglossc.Import(d.s, td.Input)
+		if err != nil {
+			t.Fatalf("%s: invalid style: %v", td.Pos, err)
+		}
+		d.s = newStyle
+
+		o := d.s.Render(d.text)
+		o = strings.ReplaceAll(o, "\n", "␤\n")
+		if !d.spaces {
+			o = strings.ReplaceAll(o, " ", "·")
+		}
+		// Add a "no newline at end" marker if there was no newline at the end.
+		if len(o) == 0 || o[len(o)-1] != '\n' {
+			o += "🛇"
+		}
+		return o
+
+	default:
+		t.Fatalf("%s: unknown command: %q", td.Pos, td.Cmd)
+		return "" // unreachable
+	}
+}
diff --git a/testdata/align b/testdata/align
new file mode 100644
index 00000000..748f76b2
--- /dev/null
+++ b/testdata/align
@@ -0,0 +1,55 @@
+set
+width: 20;
+----
+hello!··············🛇
+
+subtest single_line
+
+set
+align: right
+----
+··············hello!🛇
+
+set
+align: center
+----
+·······hello!·······🛇
+
+set
+align: left
+----
+hello!··············🛇
+
+subtest end
+
+subtest multi_line
+
+text
+small
+
+long line
+----
+ok
+
+set
+align: right
+----
+···············small␤
+····················␤
+···········long·line🛇
+
+set
+align: center
+----
+·······small········␤
+····················␤
+·····long·line······🛇
+
+set
+align: left
+----
+small···············␤
+····················␤
+long·line···········🛇
+
+subtest end
diff --git a/testdata/borders b/testdata/borders
new file mode 100644
index 00000000..8a7e32b4
--- /dev/null
+++ b/testdata/borders
@@ -0,0 +1,254 @@
+# This text has the following properties:
+# 2nd line is longer than the first, to demonstrate padding on 1st line.
+# 3rd line is shorter than the first two, to demonstrate padding on the right.
+text
+hello
+universe
+!!
+----
+ok
+
+# We also make the style 1 higher, to demonstrate border padded around empty lines.
+set
+height: 4
+----
+hello···␤
+universe␤
+!!······␤
+········🛇
+
+subtest border_styles
+
+set
+border: normal
+----
+┌────────┐␤
+│hello···│␤
+│universe│␤
+│!!······│␤
+│········│␤
+└────────┘🛇
+
+set
+border: double
+----
+╔════════╗␤
+║hello···║␤
+║universe║␤
+║!!······║␤
+║········║␤
+╚════════╝🛇
+
+set
+border: thick
+----
+┏━━━━━━━━┓␤
+┃hello···┃␤
+┃universe┃␤
+┃!!······┃␤
+┃········┃␤
+┗━━━━━━━━┛🛇
+
+set
+border: rounded
+----
+╭────────╮␤
+│hello···│␤
+│universe│␤
+│!!······│␤
+│········│␤
+╰────────╯🛇
+
+set
+border: hidden
+----
+··········␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+··········🛇
+
+subtest end
+
+subtest border_parts
+
+set
+border: border("","","","","","","","")
+----
+hello···␤
+universe␤
+!!······␤
+········🛇
+
+set
+border: border("a","","","","","","","") true
+----
+·aaaaaaaa·␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+··········🛇
+
+set
+border: border("","a","","","","","","") true
+----
+··········␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+·aaaaaaaa·🛇
+
+set
+border: border("","","a","","","","","")
+----
+··········␤
+ahello····␤
+auniverse·␤
+a!!·······␤
+a·········␤
+··········🛇
+
+set
+border: border("","","","a","","","","")
+----
+··········␤
+·hello···a␤
+·universea␤
+·!!······a␤
+·········a␤
+··········🛇
+
+set
+border: border("","","","","a","","","")
+----
+a·········␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+··········🛇
+
+set
+border: border("","","","","","a","","")
+----
+·········a␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+··········🛇
+
+set
+border: border("","","","","","","a","")
+----
+··········␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+·········a🛇
+
+set
+border: border("","","","","","","","a")
+----
+··········␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+a·········🛇
+
+subtest end
+
+subtest border_wide_parts
+
+# The following tests use a wide rune as border.
+
+set
+border: border("⏩","","","","","","","") true
+----
+·⏩⏩⏩⏩·␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+··········🛇
+
+set
+border: border("","⏩","","","","","","") true
+----
+··········␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+·⏩⏩⏩⏩·🛇
+
+set
+border: border("","","⏩","","","","","")
+----
+···········␤
+⏩hello····␤
+⏩universe·␤
+⏩!!·······␤
+⏩·········␤
+···········🛇
+
+set
+border: border("","","","⏩","","","","")
+----
+··········␤
+·hello···⏩␤
+·universe⏩␤
+·!!······⏩␤
+·········⏩␤
+··········🛇
+
+set
+border: border("","","","","⏩","","","")
+----
+⏩········␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+··········🛇
+
+# Rendering bug?
+# see: https://github.com/charmbracelet/lipgloss/issues/114
+set
+border: border("","","","","","⏩","","")
+----
+·········⏩␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+··········🛇
+
+# Rendering bug?
+# see: https://github.com/charmbracelet/lipgloss/issues/114
+set
+border: border("","","","","","","⏩","")
+----
+··········␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+·········⏩🛇
+
+set
+border: border("","","","","","","","⏩")
+----
+··········␤
+·hello····␤
+·universe·␤
+·!!·······␤
+··········␤
+⏩········🛇
+
+subtest end
diff --git a/testdata/color b/testdata/color
new file mode 100644
index 00000000..7b73d678
--- /dev/null
+++ b/testdata/color
@@ -0,0 +1,126 @@
+set
+width: 20;
+----
+hello!··············🛇
+
+# The remainder of this test is best viewed
+# with a text editor that renders ANSI sequences.
+
+set
+foreground: #f00
+----
+hello!··············🛇
+
+set
+background: #0f0
+----
+hello!··············🛇
+
+subtest fill_colors
+
+set
+width: 20;
+height: 3;
+background: unset;
+foreground: #f00;
+----
+hello!··············␤
+····················␤
+····················🛇
+
+set
+foreground: unset;
+background: #f00;
+----
+hello!··············␤
+····················␤
+····················🛇
+
+subtest end
+
+subtest border_colors
+
+set
+clear;
+width: 20;
+border-style: normal;
+border-foreground: #f00
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+set
+border-foreground: unset;
+border-top-foreground: #f00
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+set
+border-foreground: unset;
+border-left-foreground: #f00
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+set
+border-foreground: unset;
+border-right-foreground: #f00
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+set
+border-foreground: unset;
+border-bottom-foreground: #f00
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+set
+border-foreground: unset;
+border-background: #0f0
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+set
+border-background: unset;
+border-top-background: #0f0
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+set
+border-background: unset;
+border-left-background: #0f0
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+set
+border-background: unset;
+border-right-background: #0f0
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+set
+border-background: unset;
+border-bottom-background: #0f0
+----
+┌────────────────────┐␤
+│hello!··············│␤
+└────────────────────┘🛇
+
+
+subtest end
diff --git a/testdata/formatting b/testdata/formatting
new file mode 100644
index 00000000..575ef7b2
--- /dev/null
+++ b/testdata/formatting
@@ -0,0 +1,101 @@
+# Use a text with a space, to show space styling.
+text
+hello    world!
+----
+ok
+
+# Toggle display of spaces.
+spvis
+----
+ok
+
+set
+clear; width: 20;
+underline: true
+----
+hello    world!     🛇
+
+# Seemingly no difference!
+# See issue: https://github.com/charmbracelet/lipgloss/issues/113
+set
+clear; width: 20;
+underline: true; underline-spaces: true
+----
+hello    world!     🛇
+
+# Weird output.
+# See issue: https://github.com/charmbracelet/lipgloss/issues/113
+set
+clear; width: 20;
+underline: true; underline-spaces: false
+----
+hello    world!     🛇
+
+# If underline is not set, underline-spaces does nothing.
+set
+clear; width: 20;
+underline-spaces: true
+----
+hello    world!     🛇
+
+set
+clear; width: 20;
+italic: true
+----
+hello    world!     🛇
+
+
+set
+clear; width: 20;
+bold: true
+----
+hello    world!     🛇
+
+
+set
+clear; width: 20;
+strikethrough: true
+----
+hello    world!     🛇
+
+# Seemingly no difference!
+# See issue: https://github.com/charmbracelet/lipgloss/issues/113
+set
+clear; width: 20;
+strikethrough: true; strikethrough-spaces: true
+----
+hello    world!     🛇
+
+# Weird output.
+# See issue: https://github.com/charmbracelet/lipgloss/issues/113
+set
+clear; width: 20;
+strikethrough: true; strikethrough-spaces: false
+----
+hello    world!     🛇
+
+# If strikethrough is not set, strikethrough-spaces does nothing.
+set
+clear; width: 20;
+strikethrough-spaces: true
+----
+hello    world!     🛇
+
+set
+clear; width: 20;
+reverse: true
+----
+hello    world!     🛇
+
+
+set
+clear; width: 20;
+blink: true
+----
+hello    world!     🛇
+
+set
+clear; width: 20;
+faint: true
+----
+hello    world!     🛇
diff --git a/testdata/spacing b/testdata/spacing
new file mode 100644
index 00000000..9777c6a8
--- /dev/null
+++ b/testdata/spacing
@@ -0,0 +1,96 @@
+text
+hello
+world
+----
+ok
+
+# Show height fill.
+set
+width: 10;
+height: 4
+----
+hello·····␤
+world·····␤
+··········␤
+··········🛇
+
+# Data wider than style: the style does wrapping.
+set
+width: 3;
+----
+hel␤
+lo·␤
+wor␤
+ld·🛇
+
+# Data taller than style.
+# All lines in the input are rendered.
+set
+width: 10;
+height: 1
+----
+hello·····␤
+world·····🛇
+
+# Data both wider and taller than style.
+# All lines in the input are rendered with wrapping.
+set
+width: 3;
+height: 1
+----
+hel␤
+lo·␤
+wor␤
+ld·🛇
+
+# Data wider than max width: data gets truncated.
+# Render not wider than max width.
+set
+clear;
+width: 10;
+height: 4;
+max-width: 3;
+----
+hel␤
+wor␤
+···␤
+···🛇
+
+# Data taller than max height: data gets truncated.
+# Render not taller than max height.
+set
+clear;
+width: 10;
+height: 4;
+max-height: 3;
+----
+hello·····␤
+world·····␤
+··········🛇
+
+set
+max-height: 1
+----
+hello·····🛇
+
+# If max-weight is larger than height,
+# and the input is smaller than height,
+# we don't get padding.
+set
+clear;
+height: 2;
+max-height: 4
+----
+hello␤
+world🛇
+
+# If we get wrapping due to limited width
+# max-height applies after the wrapping.
+set
+height: unset;
+width: 3;
+max-height: 3;
+----
+hel␤
+lo·␤
+wor🛇